AS208867 - it-globalnet Globalnet Italia S.R.LPARFC 4890 ✓RPKI ✓ 1/1ASPA -

AS overview

Test target: 2a04:b1c0::1 · static prefix probe · address space: PA · prefixes announced: 1

prefix(es): 2a04:b1c0::/29

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

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

We probed 35 arbitrary IPv6 address(es) inside AS208867's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:7f8:b:100:1d1:a520:8867:59 at hop 12 - that router does not answer ICMPv6 Echo. This is not in AS208867'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

Type 2 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T12:04:04Z

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.011ms pmtu 1500
 1:  _gateway                                              5.732ms 
 1:  _gateway                                             16.393ms 
 2:  2001:7f8:1e::4                                        0.905ms 
 3:  2001:7f8:30:0:2:1:0:9002                             13.055ms 
 4:  RT.MIX.MIL.IT.retn.net                               31.725ms 
 5:  GW-AS5398.retn.net                                   22.322ms asymm  7 
 6:  2a0f:e880:0:70::2                                    28.797ms asymm  5 
 7:  2a04:b1c0::1                                         29.074ms reached
     Resume: pmtu 1500 hops 7 back 5 

From DE host (Berlin)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.013ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.435ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.395ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.010ms 
 3:  ae0-10.cr10.ber03.lwlcom.net                          1.251ms 
 4:  ae0-15.cr11.dtm01.lwlcom.net                          8.594ms asymm  5 
 5:  ae0-10.cr10.dtm02.lwlcom.net                          8.745ms asymm  6 
 6:  ae0-20.cr10.dus04.lwlcom.net                          8.757ms asymm  5 
 7:  ae0-20.cr10.dus01.lwlcom.net                          8.671ms asymm  4 
 8:  ae6-60.cr10.ams01.lwlcom.net                         11.650ms asymm  5 
 9:  2001:7f8:12a::18                                     15.018ms asymm  4 
10:  2a03:b020::225                                       24.465ms asymm  4 
11:  2a04:b1c0::1                                         24.699ms reached
     Resume: pmtu 1500 hops 11 back 11 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.016ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.299ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.276ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.057ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.422ms 
 5:  lag0-vl1011.core1-fra-ix.bb.wiit.network              4.502ms 
 6:  lag0-vl1001.core1-nbg-ncd.bb.wiit.network             7.160ms 
 7:  lag0-vl6.core2-nbg-ncd.bb.wiit.network                7.039ms 
 8:  lag0-vl1006.core2-muc2.bb.wiit.network                9.575ms 
 9:  lag0-vl1009.core1-muc-eq3.bb.wiit.network            10.066ms 
10:  lag0-vl1001.core1-pda-vsix.bb.wiit.network           20.558ms 
11:  lag0-vl1001.core1-mil-mix.bb.wiit.network            20.196ms asymm  9 
12:  globalnetitalia-AS208867.mix-it.net                  20.484ms asymm 10 
13:  2a04:b1c0::1                                         20.563ms reached
     Resume: pmtu 1500 hops 13 back 10 

From NL host (go6lab)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.059ms pmtu 1500
 1:  2a00:8642:42::2                                       4.953ms 
 1:  2a00:8642:42::2                                       1.585ms 
 2:  no reply
 3:  speed-ix.fibertelecom.it                              4.067ms 
 4:  2a03:b020::225                                       20.168ms 
 5:  2a04:b1c0::1                                         21.401ms reached
     Resume: pmtu 1500 hops 5 back 5 

From ITA host (Karsolink)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.028ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.649ms 
 1:  karsolink-01.net.karsolink.com                        0.820ms 
 2:  2a12:d8c0:109f:121::a1                                0.547ms 
 3:  no reply
 4:  globalnetitalia-AS208867.mix-it.net                   9.392ms 
 5:  2a04:b1c0::1                                          9.516ms reached
     Resume: pmtu 1500 hops 5 back 4 

From SLO host (6connect)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

Rate-limited ICMPv6: hop 4, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.022ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.564ms 
 1:  fw1-lju.6connect.com                                  0.473ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.277ms 
 4:  2a03:a100:0:201:1::1                                  1.082ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.064ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.434ms 
 7:  no reply
 8:  globalnetitalia-AS208867.mix-it.net                  10.692ms asymm  6 
 9:  2a04:b1c0::1                                         10.716ms reached
     Resume: pmtu 1500 hops 9 back 7 

From SLO host (T-2)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

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

tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       3.561ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.755ms 
 4:  hurricane-electric.nikhef.nlsix.net                  41.530ms 
 5:  hurricane-electric.nikhef.nlsix.net                  41.033ms asymm  4 
 6:  be7.core2.fra2.he.net                                44.312ms asymm  5 
 7:  be10.core1.zrh2.he.net                               49.808ms asymm  8 
 8:  be10.core1.zrh2.he.net                               51.079ms 
 9:  be1.core1.mil2.he.net                                40.839ms asymm  7 
10:  globalnetitalia-AS208867.mix-it.net                  36.489ms asymm  7 
11:  2a04:b1c0::1                                         37.481ms reached
     Resume: pmtu 1500 hops 11 back 7