AS31319 ESTRACOM-AS ESTRACOM SPA

AS overview

Test target: 2a03:8c80:ffff:7724:5395:128:0:94 · dns01.estracom.it · address space: mixed · prefixes announced: 2

prefix(es): 2a03:8c80::/29, 2a01:63c0::/32

Targets & per-vantage-point probe results (2 target(s) across 7 vantage point(s))

Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback

Target IP / hostname	Source	SRB host (SOX, Belgrade)					DE host (Berlin)					DE host (Düsseldorf)					NL host (go6lab)					ITA host (Karsolink)					SLO host (6connect)					SLO host (T-2)
Target IP / hostname	Source	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached
`2a03:8c80:ffff:7724:5395:128:0:94` dns01.estracom.it	NS	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-
`2a03:8c80:ffff:7724:5395:128:0:95` dns02.estracom.it	NS	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-	✓	✓	?	?	-

MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO peering

MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO member - Open peering, peering member, since 2013-09-19. IPv6 LAN: 2001:7f8:b:100:1d1:a5d3:1319:122. Locations: -.

RPKI & ASPA

2 of 2 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a03:8c80::/29`	✓ valid	matched VRP (correct origin, length within maxLength)	AS31319 /29 maxLen 29 (ripe)
`2a01:63c0::/32`	✓ valid	matched VRP (correct origin, length within maxLength)	AS31319 /32 maxLen 32 (ripe)

ASPA: this AS has published an ASPA record listing 2 upstream provider(s) that are authorized to propagate routes from it: AS174, AS1299. Routes from this AS that arrive via any other upstream are considered ASPA-invalid by validators that enforce ASPA.

Random-IP probe (yarrp) into the AS' prefixes

We probed 70 arbitrary IPv6 address(es) inside AS31319's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:470:e:5a::2 at hop 7 - that router answers ICMPv6 Echo. This is not in AS31319's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Vantage points disagree about Type 2 acceptance - transit ASes on one path may be filtering Type 2 even though the destination's stack accepts it on another path:

SRB host (SOX, Belgrade): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
DE host (Berlin): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
DE host (Düsseldorf): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)
NL host (go6lab): inconclusive: no Echo Reply after PTB (probe 1500B). (ICMPv6 Echo + forged PTB)
ITA host (Karsolink): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
SLO host (6connect): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)
SLO host (T-2): Type 2 honored. Forged PTB accepted; next response shrunk. (ICMPv6 Echo + forged PTB)

Why they disagree - measurement artifact: One vantage's probe didn't generate enough data to detect segment shrinkage (natural reply too small, or no second response). The other vantage's verdict is the meaningful one.

Failure detail - what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
belgrade	`2a09:ab81::91`	`2a03:8c80:ffff:7724:5395:128:0:94`	`icmp6-echo`	honored	2026-09-23T12:03:35Z
berlin	`2a06:d1c1:10b::cccc`	`2a03:8c80:ffff:7724:5395:128:0:94`	`icmp6-echo`	honored	2026-09-23T12:03:33Z
duseldorf	`2a06:d1c1:10d::aaaa`	`2a03:8c80:ffff:7724:5395:128:0:94`	`icmp6-echo`	inconclusive	2026-09-23T12:03:30Z
go6lab	`2a00:8642:42::75`	`2a03:8c80:ffff:7724:5395:128:0:94`	`icmp6-echo`	inconclusive	2026-09-23T12:04:32Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2a03:8c80:ffff:7724:5395:128:0:94`	`icmp6-echo`	honored	2026-09-23T12:03:32Z
odin	`2607:fae0:a000::42`	`2a03:8c80:ffff:7724:5395:128:0:94`	`icmp6-echo`	honored	2026-09-23T12:03:28Z
t2	`2a01:261:313:b814:2a0:98ff:fe5b:13e4`	`2a03:8c80:ffff:7724:5395:128:0:94`	`icmp6-echo`	honored	2026-09-23T12:03:34Z

Attempt log (belgrade):

icmp6-echo → honored (honored by fragmenting its reply into 2 via the IPv6 Fragment Header, rather than resizing)
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (berlin):

icmp6-echo → honored (honored by fragmenting its reply into 2 via the IPv6 Fragment Header, rather than resizing)
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (duseldorf):

icmp6-echo → inconclusive (reply 1460 B before PTB): no Echo Reply after PTB (probe 1500B)
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (go6lab):

icmp6-echo → inconclusive (reply 1460 B before PTB): no Echo Reply after PTB (probe 1500B)
dns-tcp → inconclusive (reply 105 B before PTB): max DNS-over-TCP segment 105B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (karsolink):

icmp6-echo → honored (honored by fragmenting its reply into 2 via the IPv6 Fragment Header, rather than resizing): natural Echo Reply at 1300B was already split into IPv6 fragments without our PTB intervention -- the destination's stack has a cached path MTU below 1300B from a previously-honored ICMPv6 Type 2, which is itself evidence that this destination honors PTB on this path.
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (odin):

icmp6-echo → honored (honored by fragmenting its reply into 2 via the IPv6 Fragment Header, rather than resizing): natural Echo Reply at 1500B was already split into IPv6 fragments without our PTB intervention -- the destination's stack has a cached path MTU below 1500B from a previously-honored ICMPv6 Type 2, which is itself evidence that this destination honors PTB on this path.
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (t2):

icmp6-echo → honored (honored by fragmenting its reply into 2 via the IPv6 Fragment Header, rather than resizing)
dns-tcp → inconclusive (reply 156 B before PTB): max DNS-over-TCP segment 156B; not big enough to test PMTU shrink
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

To match the corresponding ICMPv6 packet on your side (host firewall, AS edge, or transit tap), look for our PTBs around the timestamps above:

sudo tcpdump -i any -n -e 'icmp6 and ip6[40] = 2 and (src host 2607:fae0:a000::42 or src host 2a00:8642:42::75 or src host 2a01:261:313:b814:2a0:98ff:fe5b:13e4 or src host 2a06:d1c1:10b::cccc or src host 2a06:d1c1:10d::aaaa or src host 2a09:ab81::91 or src host 2a12:d8c0:105a:9001::a154)'

If you see our PTBs arriving but the destination's TCP/Echo flow does not shrink, the drop is in the destination kernel (cause 3 below). If you don't see them at all, drop is upstream of you (cause 2). If you only see them from some of our source IPs but not others, the drop is path-asymmetric - at least one transit on the differing route is filtering.

Where the path divergence is

Per-vantage probe + verdict (headline):

belgrade: probe icmp6-echo → verdict honored
berlin: probe icmp6-echo → verdict honored
duseldorf: probe icmp6-echo → verdict inconclusive
go6lab: probe icmp6-echo → verdict inconclusive
karsolink: probe icmp6-echo → verdict honored
odin: probe icmp6-echo → verdict honored
t2: probe icmp6-echo → verdict honored

Full per-method matrix (all four methods run at each vantage):

vantage	icmp6-echo	dns-tcp	tls	http
belgrade	honored	inconclusive	no_tcp	no_tcp
berlin	honored	inconclusive	no_tcp	no_tcp
duseldorf	inconclusive	inconclusive	no_tcp	no_tcp
go6lab	inconclusive	inconclusive	no_tcp	no_tcp
karsolink	honored	inconclusive	no_tcp	no_tcp
odin	honored	inconclusive	no_tcp	no_tcp
t2	honored	inconclusive	no_tcp	no_tcp

✓ All vantages agree on method(s): icmp6-echo - the headline-method spread above is dispatcher noise, not a real Type 2 disagreement.

These vantage-level disagreements are rooted somewhere in the forward paths. Joining each per-vantage traceroute against the IP→AS lookup from our global yarrp mesh, the first hop where the paths land in different ASes is the most likely site of the offending filter / unreachable AS / Type 2 drop.

Suspect transit ASes (ranked by how often they appear at the divergence point on the path of the worse-classifying vantage): AS31319, AS6939.

From belgrade (open/Type-2=honored) the path enters an opaque hop at hop 10; from berlin (open/Type-2=honored) the same hop is in AS31319. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=honored) the path enters AS31319 at hop 8; from go6lab (open/Type-2=inconclusive) the same hop is in an opaque hop. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=honored) the path enters AS31319 at hop 8; from karsolink (open/Type-2=honored) the same hop is in an opaque hop. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=honored) the path enters AS31319 at hop 9; from odin (open/Type-2=honored) the same hop is in an opaque hop. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From belgrade (open/Type-2=honored) the path enters an opaque hop at hop 10; from t2 (open/Type-2=honored) the same hop is in AS31319. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=honored) the path enters AS31319 at hop 10; from duseldorf (open/Type-2=inconclusive) the same hop is in an opaque hop. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=honored) the path enters AS31319 at hop 9; from go6lab (open/Type-2=inconclusive) the same hop is in an opaque hop. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=honored) the path enters AS31319 at hop 9; from karsolink (open/Type-2=honored) the same hop is in an opaque hop. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=honored) the path enters AS31319 at hop 9; from odin (open/Type-2=honored) the same hop is in an opaque hop. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From berlin (open/Type-2=honored) the path enters an opaque hop at hop 11; from t2 (open/Type-2=honored) the same hop is in AS31319. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=inconclusive) the path enters AS31319 at hop 8; from go6lab (open/Type-2=inconclusive) the same hop is in an opaque hop. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=inconclusive) the path enters AS31319 at hop 8; from karsolink (open/Type-2=honored) the same hop is in an opaque hop. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=inconclusive) the path enters AS31319 at hop 9; from odin (open/Type-2=honored) the same hop is in an opaque hop. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From duseldorf (open/Type-2=inconclusive) the path enters an opaque hop at hop 10; from t2 (open/Type-2=honored) the same hop is in AS31319. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (open/Type-2=inconclusive) the path enters an opaque hop at hop 8; from odin (open/Type-2=honored) the same hop is in AS31319. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From go6lab (open/Type-2=inconclusive) the path enters AS31319 at hop 6; from t2 (open/Type-2=honored) the same hop is in AS6939. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From karsolink (open/Type-2=honored) the path enters an opaque hop at hop 8; from odin (open/Type-2=honored) the same hop is in AS31319. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From karsolink (open/Type-2=honored) the path enters AS31319 at hop 6; from t2 (open/Type-2=honored) the same hop is in AS6939. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.
From odin (open/Type-2=honored) the path enters an opaque hop at hop 10; from t2 (open/Type-2=honored) the same hop is in AS31319. Last common AS: AS31319. The disagreement is most likely rooted in one of those two transit ASes.

Diagnosis is path-level, not packet-level: it tells you which transit AS is the prime suspect, not exactly which firewall rule is to blame. Use the tracepath6 output below (when available) for per-hop PMTU evidence on the same path.

✨ Diagnostic interpretation

An operator-targeted diagnostic interpretation can be generated for this AS on demand. The pipeline holds the raw verdicts and the per-hop walk; an AI pass synthesises where to start looking. Click the button below to run it.

Multi-vantage path map

Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗

● SRB host (SOX, Belgrade)
● DE host (Berlin)
● DE host (Düsseldorf)
● NL host (go6lab)
● ITA host (Karsolink)
● SLO host (6connect)
● SLO host (T-2)
── solid line = echo reply, PTB honored (clean reach)
— — dashed line = echo reply but PTB not honored (RFC 4890 violation)
no line = no echo reply (never reached)
◉ target: green = clean, amber = reachable-but-violation / unreachable
⚠ suspected drop AS
⋯ silent (unanswered) hops
● IXP hop

From SRB host (SOX, Belgrade) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 49.3ms

4/4

Echo 1500B (DF) 49.3ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a09:ab81::1	0.3ms	0%*	AS60733	PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2	sox-pn.sox.rs 2001:7f8:1e:8::3a	0.5ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
3	2001:7f8:1e:8::3d	0.4ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
4	2a02:2d8:0:a00e:232a	12.7ms	0%	-
5	RT.TC2.AMS.NL.retn.net 2a02:2d8::57f5:e0b4	28.6ms	0%	AS9002	RETN-AS - RETN Limited, GB
6	2001:7f8:1::a503:1319:1	45.1ms	0%	-	NA
7	2a03:8c80:ffff:7730:ac14:190:100:a	47.9ms	70%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
8	2a03:8c80:ffff:7730:ac14:190:24:b	50.3ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
9	2a03:8c80:ffff:7728:ac19:253:224:238	49.0ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
10	*	-	0%	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

Rate-limited ICMPv6: hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.013ms pmtu 1500
 1:  _gateway                                              0.469ms 
 1:  _gateway                                              0.366ms 
 2:  sox-pn.sox.rs                                         0.348ms 
 3:  2001:7f8:1e:8::3d                                     0.609ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       12.829ms asymm  3 
 5:  RT.TC2.AMS.NL.retn.net                               28.755ms 
 6:  2001:7f8:1::a503:1319:1                              43.162ms asymm  5 
 7:  2a03:8c80:ffff:7730:ac14:190:104:a                   50.328ms asymm  6 
 8:  2a03:8c80:ffff:7730:ac14:190:24:b                    50.377ms asymm  7 
 9:  2a03:8c80:ffff:7728:ac19:253:224:238                 47.235ms asymm  8 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From DE host (Berlin) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 36.2ms

4/4

Echo 1500B (DF) 36.3ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02	0.7ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	ae0-150.cr10.fra01.lwlcom.net 2a00:c380:b200:230::174	10.0ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-100.cr10.fra02.lwlcom.net 2a00:c380:b200:230::215	10.2ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	ae0-10.cr10.fra06.lwlcom.net 2a00:c380:b200:230::236	10.0ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
6	ams-ix.1-ix.net 2001:7f8:115:1::7	15.9ms	0%	-	NA
7	*	-	0%	-
8	*	-	20%	-
9	2a03:8c80:ffff:7730:ac14:190:24:b	36.9ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
10	2a03:8c80:ffff:7728:ac19:253:224:238	36.2ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
11	*	-	0%	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

Rate-limited ICMPv6: hop 8 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.134ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.361ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.507ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.844ms 
 3:  ae0-150.cr10.fra01.lwlcom.net                        10.334ms asymm  7 
 4:  ae0-100.cr10.fra02.lwlcom.net                        10.721ms asymm  8 
 5:  ae0-10.cr10.fra06.lwlcom.net                         10.087ms asymm  7 
 6:  ams-ix.1-ix.net                                      17.328ms asymm  8 
 7:  2001:7f8:1::a503:1319:1                              32.511ms 
 8:  2a03:8c80:ffff:7730:ac14:190:100:a                   37.288ms 
 9:  2a03:8c80:ffff:7730:ac14:190:20:b                    35.111ms 
10:  2a03:8c80:ffff:7728:ac19:253:224:238                 36.319ms asymm 11 
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From DE host (Düsseldorf) open

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 17.9ms

4/4

Echo 1500B (DF) 17.9ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	eth1-0-12-h5594.edge5-dus1.bb.wiit.network 2001:4ba0:92f4:3::1	18.3ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
3	lag10-h5f01.agr4-dus1.bb.wiit.network 2001:4ba0:ffe9:7c::1	159.5ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
4	lag11.core3-dus1.bb.wiit.network 2001:4ba0:ffe9:115::3	0.2ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
5	lag8.core1-dus-ix.bb.wiit.network 2001:4ba0:ffe9:8::2	0.4ms	0%	AS24961	MYLOC-AS - WIIT AG, DE
6	decix.estracom.it 2001:7f8::7a57:0:1	13.7ms	-	-	NA
7	2a03:8c80:ffff:7730:ac14:190:100:a	18.4ms	90%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
8	2a03:8c80:ffff:7730:ac14:190:24:b	18.8ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
9	2a03:8c80:ffff:7728:ac19:253:224:238	17.7ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
10	*	-	0%	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

Rate-limited ICMPv6: hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.418ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.273ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            6.808ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.607ms 
 5:  lag2.core1-dus-ix.bb.wiit.network                     0.463ms 
 6:  decix.estracom.it                                    13.976ms 
 7:  2a03:8c80:ffff:7730:ac14:190:100:a                   18.658ms 
 8:  2a03:8c80:ffff:7730:ac14:190:20:b                    19.416ms asymm  9 
 9:  2a03:8c80:ffff:7728:ac19:253:224:238                 17.942ms 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From NL host (go6lab) open

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 40.1ms

4/4

Echo 1500B (DF) 39.0ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::2	1.5ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	*	-	-	-
3	ccr2-ccr1.dc1.nogalliance.org 2a00:8642:dc1:2::b	2.8ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
4	2001:7f8:1::a503:1319:1	31.8ms	50%	-	NA
5	2a03:8c80:ffff:7730:ac14:190:100:a	99.4ms	10%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
6	2a03:8c80:ffff:7730:ac14:190:24:b	35.9ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
7	2a03:8c80:ffff:7728:ac19:253:224:238	36.0ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
8	*	-	0%	-
9	*	-	-	-
10	*	-	-	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

Rate-limited ICMPv6: hop 4, hop 5 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.040ms pmtu 1500
 1:  2a00:8642:42::2                                       3.095ms 
 1:  2a00:8642:42::2                                       3.995ms 
 2:  gw.friends.steffann.nl                                4.656ms 
 3:  no reply
 4:  2001:7f8:1::a503:1319:1                              31.614ms asymm  5 
 5:  2a03:8c80:ffff:7730:ac14:190:104:a                   37.704ms asymm  6 
 6:  2a03:8c80:ffff:7730:ac14:190:20:b                    40.717ms asymm  7 
 7:  2a03:8c80:ffff:7728:ac19:253:224:238                 39.748ms asymm  9 
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From ITA host (Karsolink) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 13.6ms

3/4

Echo 1500B (DF) 13.8ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	-	-
2	*	-	-	-
3	*	-	-	-
4	estracom-v6.mix-it.net @MIX-IT / NAMEX / MINAP / TOP-IX / VSIX / EQUINIX-MILAN / BGPX-ROME / NAMEX-BARI / PCIX / DECIX-PALERMO 2001:7f8:b:100:1d1:a5d3:1319:122	52.1ms	70%	-	NA
5	2a03:8c80:ffff:7730:ac14:190:100:a	14.0ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
6	2a03:8c80:ffff:7730:ac14:190:24:b	14.2ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
7	2a03:8c80:ffff:7728:ac19:253:224:238	13.4ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
8	*	-	0%	-
9	*	-	-	-
10	*	-	-	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

Rate-limited ICMPv6: hop 4 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.078ms pmtu 1500
 1:  no reply
 2:  no reply
 3:  no reply
 4:  estracom-v6.mix-it.net                                9.777ms 
 5:  2a03:8c80:ffff:7730:ac14:190:100:a                   14.505ms 
 6:  2a03:8c80:ffff:7730:ac14:190:24:b                    14.873ms 
 7:  2a03:8c80:ffff:7728:ac19:253:224:238                 13.697ms 
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500

From SLO host (6connect) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 28.1ms

3/4

Echo 1500B (DF) 28.1ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	0.2ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	-	-
3	*	-	0%	-
4	2a00:ee0:1:15::2	1.1ms	0%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
5	*	-	0%	-
6	*	-	0%	-
7	2a03:8c80:ffff:7730:ac14:190:24:b	28.6ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
8	2a03:8c80:ffff:7728:ac19:253:224:238	27.6ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
9	*	-	0%	-
10	*	-	-	-
11	*	-	-	-
12	*	-	-	-
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.747ms 
 1:  fw1-lju.6connect.com                                  0.627ms 
 2:  ccr-to-fw-ccr1-gw-lju.6connect.com                    0.923ms 
 3:  2a00:ee1:800:9::1                                     2.457ms 
 4:  2a00:ee0:1:10::2                                      1.924ms asymm  3 
 5:  2a00:ee0:1:15::2                                      3.002ms pmtu 1500
 5:  decix.estracom.it                                    23.829ms asymm  9 
 6:  2a03:8c80:ffff:7730:ac14:190:100:a                   29.140ms asymm 10 
 7:  2a03:8c80:ffff:7730:ac14:190:24:b                    29.454ms asymm 11 
 8:  2a03:8c80:ffff:7728:ac19:253:224:238                 28.005ms asymm 12 
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
     Too many hops: pmtu 1500

From SLO host (T-2) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 50.5ms

4/4

Echo 1500B (DF) 51.3ms

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	-	-
2	2a01:260:1::225	13.9ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
3	2a01-260-1-1--9c.core6.t-2.net 2a01:260:1:1::9c	14.0ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
4	*	-	0%	-
5	*	-	0%	-
6	be7.core2.fra2.he.net 2001:470:e:18::2	50.1ms	40%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	*	-	-	-
8	decix.estracom.it 2001:7f8::7a57:0:1	56.4ms	-	-	NA
9	decix.estracom.it 2001:7f8::7a57:0:1	50.6ms	80%	-	NA
10	2a03:8c80:ffff:7730:ac14:190:104:a	51.2ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
11	2a03:8c80:ffff:7728:ac19:253:224:238	51.3ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
12	2a03:8c80:ffff:7728:ac19:253:224:238	49.3ms	0%	AS31319	ESTRACOM-AS - ESTRACOM SPA, IT
13	*	-	-	-
14	*	-	-	-
15	*	-	-	-
16	*	-	-	-
17	*	-	-	-
18	*	-	-	-

Rate-limited ICMPv6: hop 6, hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.155ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       3.079ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        3.255ms 
 4:  hurricane-electric.nikhef.nlsix.net                  32.946ms 
 5:  be7.core2.fra2.he.net                                36.956ms 
 6:  be1.core2.fra2.he.net                                38.713ms asymm  5 
 7:  no reply
 8:  decix.estracom.it                                    44.934ms 
 9:  decix.estracom.it                                    45.811ms asymm  8 
10:  2a03:8c80:ffff:7730:ac14:190:20:b                    52.107ms asymm 11 
11:  2a03:8c80:ffff:7730:ac14:190:20:b                    51.541ms 
12:  2a03:8c80:ffff:7728:ac19:253:224:238                 50.362ms asymm 11 
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500