AS201722 - AS-WIRNEXT NEXT SRLPARPKI ✓ 2/2ASPA -

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AS overview

Test target: 2a05:8f80:2a::2 · ns1.wirnext.net · address space: PA · prefixes announced: 2

prefix(es): 2a05:8f80::/32, 2a05:8f81::/32

Targets & per-vantage-point probe results (5 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 / hostnameSourceSRB host (SOX, Belgrade)DE host (Berlin)DE host (Düsseldorf)NL host (go6lab)ITA host (Karsolink)SLO host (6connect)SLO host (T-2)
ping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reached
2a05:8f80:2a::2
ns1.wirnext.net
NSrefusedrefusedrefusedrefusedrefusedrefused-????-refusedrefusedrefusedrefused
2a05:8f80:8000::10
atlas.cloudnext.it
SPFopenopenopenopen-??openopenopenopenopenopenopenopen-
2a05:8f80:8000::15
next-com.it
DMARCopenopenopenopenopenopen-openopen-openopenopenopen-openopen-
2a05:8f80:8000::25
wirnext.it
drvopenopenopenopenopenopenopenopen??openopenopenopen
2a05:8f80::4
ns2.wirnext.net
NSrefusedrefused-refusedrefusedrefusedrefused??refusedrefused-refusedrefused??

RPKI & ASPA

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

PrefixRPKI stateReasonCovering VRP(s)
2a05:8f80::/32✓ validmatched VRP (correct origin, length within maxLength)AS201722 /32 maxLen 32 (ripe)
2a05:8f81::/32✓ validmatched VRP (correct origin, length within maxLength)AS201722 /32 maxLen 32 (ripe)

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

At least one router inside AS201722's announced prefix replied during the random-target probe. Hop(s): 2a05:8f81::2. These are candidate targets for direct testing.

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

Type 2 active test inconclusive: no Echo Reply to 1300-byte probe.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T12:04:28Z

Failure detail - what to grep in your logs
vantageour sourceyour targetmethodresulttested (UTC)
belgrade2a09:ab81::912a05:8f80:2a::2icmp6-echono_echo2026-09-23T12:04:28Z
berlin2a06:d1c1:10b::cccc2a05:8f80:2a::2icmp6-echono_echo2026-09-23T12:04:27Z
duseldorf2a06:d1c1:10d::aaaa2a05:8f80:2a::2icmp6-echono_echo2026-09-23T12:04:24Z
go6lab2a00:8642:42::752a05:8f80:2a::2icmp6-echono_echo2026-09-23T12:05:33Z
karsolink2a12:d8c0:105a:9001::a1542a05:8f80:2a::2icmp6-echono_echo2026-09-23T12:04:26Z
odin2607:fae0:a000::422a05:8f80:2a::2icmp6-echono_echo2026-09-23T12:04:21Z
t22a01:261:313:b814:2a0:98ff:fe5b:13e42a05:8f80:2a::2icmp6-echono_echo2026-09-23T12:04:27Z

Attempt log (belgrade):

  1. icmp6-echono_echo: no Echo Reply to 1300-byte probe
  2. dns-tcpno_tcp: connect failed: timed out
  3. tlsno_tcp: TLS connect failed
  4. httpno_tcp: tcp/80 not open

Attempt log (berlin):

  1. icmp6-echono_echo: no Echo Reply to 1300-byte probe
  2. dns-tcpno_tcp: connect failed: timed out
  3. tlsno_tcp: TLS connect failed
  4. httpno_tcp: tcp/80 not open

Attempt log (duseldorf):

  1. icmp6-echono_echo: no Echo Reply to 1300-byte probe
  2. dns-tcpno_tcp: connect failed: timed out
  3. tlsno_tcp: TLS connect failed
  4. httpno_tcp: tcp/80 not open

Attempt log (go6lab):

  1. icmp6-echono_echo: no Echo Reply to 1300-byte probe
  2. dns-tcpno_tcp: connect failed: timed out
  3. tlsno_tcp: TLS connect failed
  4. httpno_tcp: tcp/80 not open

Attempt log (karsolink):

  1. icmp6-echono_echo: no Echo Reply to 1300-byte probe
  2. dns-tcpno_tcp: connect failed: timed out
  3. tlsno_tcp: TLS connect failed
  4. httpno_tcp: tcp/80 not open

Attempt log (odin):

  1. icmp6-echono_echo: no Echo Reply to 1300-byte probe
  2. dns-tcpno_tcp: connect failed: timed out
  3. tlsno_tcp: TLS connect failed
  4. httpno_tcp: tcp/80 not open

Attempt log (t2):

  1. icmp6-echono_echo: no Echo Reply to 1300-byte probe
  2. dns-tcpno_tcp: connect failed: timed out
  3. tlsno_tcp: TLS connect failed
  4. httpno_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.

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 ↗

multi-vantage path diagram for AS201722

From SRB host (SOX, Belgrade)   open

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

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a09:ab81::10.2ms0%*AS60733PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
22001:7f8:1e::1080.4ms0%AS13004SOX - Serbian Open Exchange DOO, RS
32001:b28:3ff::a16f:0:141.2ms0%AS31500GNM-AS - Global Network Management Inc, AG
42a03:b020::25453.8ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
52a03:b020:1:25::b61.0ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
62a05:8f81::261.1ms0%AS201722AS-WIRNEXT - NEXT SRL, IT
7ns1.wirnext.net
2a05:8f80:2a::2
60.7ms0%AS201722AS-WIRNEXT - NEXT SRL, IT

tracepath -6

 1?: [LOCALHOST]                        0.012ms pmtu 1500
 1:  _gateway                                              0.556ms 
 1:  _gateway                                              0.403ms 
 2:  2001:7f8:1e::108                                      0.722ms 
 3:  2001:b28:3ff::a16f:0:1                               47.310ms 
 4:  2a03:b020::254                                       54.346ms asymm  6 
 5:  2a03:b020:1:25::b                                    50.497ms asymm  7 
 6:  2a05:8f81::2                                         49.928ms asymm  8 
 7:  ns1.wirnext.net                                      56.441ms reached
     Resume: pmtu 1500 hops 7 back 9 

From DE host (Berlin)   open

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

0/4
Echo small (56B) -
1/4
Echo 1500B (DF) 33.6ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-13-178.gw01.ber01.as59645.net
2a06:d1c1:100:b::1
0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2ae0-2453.cr10.ber01.lwlcom.net
2a06:d1c0::dead:beef:1c02
0.7ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
3ae0-10.cr10.ber03.lwlcom.net
2a00:c380:b200:230::220
0.8ms0%AS50629LWLCOM - LWLcom GmbH, DE
4ae0-15.cr11.dtm01.lwlcom.net
2a00:c380:b200:230::5
8.5ms0%AS50629LWLCOM - LWLcom GmbH, DE
5ae0-10.cr10.dtm02.lwlcom.net
2a00:c380:b200:230::255
8.4ms0%AS50629LWLCOM - LWLcom GmbH, DE
6ae0-20.cr10.dus04.lwlcom.net
2a00:c380:b200:230::139
8.3ms0%AS50629LWLCOM - LWLcom GmbH, DE
7ae0-20.cr10.dus01.lwlcom.net
2a00:c380:b200:230::108
8.7ms0%AS50629LWLCOM - LWLcom GmbH, DE
8ae6-60.cr10.ams01.lwlcom.net
2a00:c380:b200:230::213
11.5ms0%AS50629LWLCOM - LWLcom GmbH, DE
92001:7f8:12a::1814.8ms0%-NA
102a03:b020::25432.9ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
112a03:b020:1:25::b32.7ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
122a05:8f81::233.2ms0%AS201722AS-WIRNEXT - NEXT SRL, IT
13ns1.wirnext.net
2a05:8f80:2a::2
33.4ms0%AS201722AS-WIRNEXT - NEXT SRL, IT

tracepath -6

 1?: [LOCALHOST]                        0.028ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.727ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.465ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.905ms 
 3:  ae0-10.cr10.ber03.lwlcom.net                          1.358ms 
 4:  ae0-15.cr11.dtm01.lwlcom.net                          9.008ms asymm  5 
 5:  ae0-10.cr10.dtm02.lwlcom.net                          9.339ms asymm  6 
 6:  ae0-20.cr10.dus04.lwlcom.net                          9.180ms asymm  5 
 7:  ae0-20.cr10.dus01.lwlcom.net                          8.937ms asymm  4 
 8:  ae6-60.cr10.ams01.lwlcom.net                         11.916ms asymm  5 
 9:  2001:7f8:12a::18                                     15.245ms asymm  4 
10:  2a03:b020::254                                       33.670ms asymm  4 
11:  2a03:b020:1:25::b                                    32.730ms asymm  5 
12:  2a05:8f81::2                                         33.241ms asymm  6 
13:  ns1.wirnext.net                                      33.749ms reached
     Resume: pmtu 1500 hops 13 back 7 

From DE host (Düsseldorf)   open

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

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-12-142.gw01.dus01.as59645.net
2a06:d1c1:100:d::1
0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2ipv6.de-cix.dus.as41327.fibertelecom.com
2001:7f8:9e::a16f:0:1
3.8ms0%-NA
32a03:b020::25421.8ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
4*---
5*---
6*---
7*---
8*---
9*---
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---

tracepath -6

 1?: [LOCALHOST]                        0.025ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.345ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.272ms 
 2:  ipv6.de-cix.dus.as41327.fibertelecom.com              4.064ms 
 3:  2a03:b020::254                                       22.156ms 
 4:  2a03:b020:1:25::b                                    22.366ms 
 5:  2a05:8f81::2                                         22.522ms 
 6:  ns1.wirnext.net                                      22.154ms reached
     Resume: pmtu 1500 hops 6 back 6 

From NL host (go6lab)   open

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

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a00:8642:42::21.2ms0%AS203993GNA-DC1-AS - S.J.M. Steffann, NL
2*-0%*-
3speed-ix.fibertelecom.it
2001:7f8:b7::a504:1327:1
3.5ms0%-NA
42a03:b020::25428.0ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5*-0%-
6*-0%-
7*-0%-
8*---
9*---
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17ns1.wirnext.net
2a05:8f80:2a::2
28.0ms-AS201722AS-WIRNEXT - NEXT SRL, IT

tracepath -6

 1?: [LOCALHOST]                        0.234ms pmtu 1500
 1:  2a00:8642:42::2                                       2.149ms 
 1:  2a00:8642:42::2                                       3.024ms 
 2:  no reply
 3:  speed-ix.fibertelecom.it                              4.878ms 
 4:  2a03:b020::254                                       27.493ms 
 5:  2a03:b020:1:25::b                                    28.170ms 
 6:  2a05:8f81::2                                         29.646ms 
 7:  ns1.wirnext.net                                      29.756ms reached
     Resume: pmtu 1500 hops 7 back 7 

From ITA host (Karsolink)   open

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

4/4
Echo small (56B) 53.2ms
1/4
Echo 1500B (DF) 19.0ms
yes
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1karsolink-01.net.karsolink.com
2a12:d8c0:105a:9001::1
0.4ms0%*AS204471KARSOLINK - 2S Computers SRL, IT
22a12:d8c0:109f:121::a10.3ms0%*AS204471KARSOLINK - 2S Computers SRL, IT
32a12:d8c0:101f:6::19.8ms50%AS204471KARSOLINK - 2S Computers SRL, IT
42a03:b020:1:51::a9.9ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
52a03:b020::25418.3ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
6*-0%-
7*-0%-
8*-0%-
9*---
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---

Rate-limited ICMPv6: hop 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.050ms pmtu 1500
 1:  no reply
 2:  no reply
 3:  2a12:d8c0:101f:6::1                                  10.712ms 
 4:  2a03:b020:1:51::a                                    10.929ms 
 5:  2a03:b020::254                                       19.026ms 
 6:  2a03:b020:1:25::b                                    19.079ms 
 7:  2a05:8f81::2                                         19.495ms 
 8:  ns1.wirnext.net                                      19.862ms reached
     Resume: pmtu 1500 hops 8 back 8 

From SLO host (6connect)   open

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

0/4
Echo small (56B) -
0/4
Echo 1500B (DF) -
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1fw1-lju.6connect.com
2607:fae0:a000::2
0.5ms0%*AS80386CONNECT - 6connect, Inc., US
2*---
32a03:a100:0:201:1::11.4ms0%AS56635XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4e0-1.core1.lju1.he.net
2001:470:1:5be::1
2.1ms0%AS6939HURRICANE - Hurricane Electric LLC, US
5100ge0-0-0-5.core1.vie1.he.net
2001:470:0:578::1
7.9ms0%AS6939HURRICANE - Hurricane Electric LLC, US
6e0-35.core2.muc1.he.net
2001:470:0:41d::2
12.6ms0%AS6939HURRICANE - Hurricane Electric LLC, US
7ipv6.de-cix.muc.as41327.fibertelecom.com
2001:7f8:44::a16f:0:1
20.9ms0%-NA
82a03:b020::25427.7ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
92a03:b020:1:25::b1530.6ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
102a05:8f81::21530.6ms0%AS201722AS-WIRNEXT - NEXT SRL, IT
11ns1.wirnext.net
2a05:8f80:2a::2
27.8ms0%AS201722AS-WIRNEXT - NEXT SRL, IT

tracepath -6

 1?: [LOCALHOST]                        0.016ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.423ms 
 1:  fw1-lju.6connect.com                                  0.575ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.336ms 
 4:  2a03:a100:0:201:1::1                                  0.850ms pmtu 1500
 4:  no reply
 5:  100ge0-0-0-5.core1.vie1.he.net                        8.729ms 
 6:  e0-35.core2.muc1.he.net                              12.283ms 
 7:  ipv6.de-cix.muc.as41327.fibertelecom.com             20.809ms asymm 10 
 8:  2a03:b020::254                                       27.741ms asymm  9 
 9:  2a03:b020:1:25::b                                    27.928ms asymm 10 
10:  2a05:8f81::2                                         27.750ms asymm 11 
11:  ns1.wirnext.net                                      28.509ms reached
     Resume: pmtu 1500 hops 11 back 12 

From SLO host (T-2)   open

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

4/4
Echo small (56B) 45.3ms
4/4
Echo 1500B (DF) 45.6ms
yes
Type 1 dest-unreach
443,80
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a01:261:313:b814::10.6ms0%*AS34779T-2-AS - T-2, d.o.o., SI
22a01:260:1::2252.1ms0%*AS34779T-2-AS - T-2, d.o.o., SI
32a01-260-1-1--9a.core6.t-2.net
2a01:260:1:1::9a
1.9ms0%*AS34779T-2-AS - T-2, d.o.o., SI
4hurricane-electric.nikhef.nlsix.net
2001:7f8:13::a500:6939:1
33.2ms0%*-NA
5*-0%-
6be47.core3.ams1.he.net
2001:470:e:12::2
36.4ms-AS6939HURRICANE - Hurricane Electric LLC, US
7be47.core3.ams1.he.net
2001:470:e:12::2
38.1ms30%AS6939HURRICANE - Hurricane Electric LLC, US
82001:7f8:12a::1836.3ms0%-NA
92a03:b020::25444.9ms0%AS41327FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
102a05:8f81::245.3ms0%AS201722AS-WIRNEXT - NEXT SRL, IT
11ns1.wirnext.net
2a05:8f80:2a::2
45.5ms0%AS201722AS-WIRNEXT - NEXT SRL, IT

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

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                      31.004ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.913ms 
 4:  2a01-260-1-1--39.core6.t-2.net                        3.306ms asymm  3 
 5:  hurricane-electric.nikhef.nlsix.net                  39.508ms asymm  4 
 6:  be47.core3.ams1.he.net                               31.641ms 
 7:  be47.core3.ams1.he.net                               37.278ms asymm  6 
 8:  2a03:5f80:4:2::236:85                                39.936ms asymm  6 
 9:  2a03:b020::254                                       42.122ms asymm  6 
10:  2a03:b020:1:25::b                                    48.852ms asymm  7 
11:  2a05:8f81::2                                         42.836ms asymm  8 
12:  ns1.wirnext.net                                      41.219ms reached
     Resume: pmtu 1500 hops 12 back 9