AS210598 - Microweb Francesco Fabbro trading as Microweb SasPARFC 4890 ✓RPKI ✓ 1/1ASPA -

AS overview

Test target: 2a11:d2c0::2 · static prefix probe · address space: PA · prefixes announced: 1

prefix(es): 2a11:d2c0::/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 AS210598's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a0b:1a00:5:2::1 at hop 13 - that router answers ICMPv6 Echo. This is not in AS210598'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 2026-09-23T12:08:53Z

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                                              0.673ms 
 1:  _gateway                                              0.666ms 
 2:  sox-pn.sox.rs                                         0.444ms 
 3:  2001:7f8:1e:8::3d                                     0.918ms asymm  2 
 4:  2001:67c:128c::699                                   17.928ms 
 5:  2a11:d2c0::2                                         45.191ms reached
     Resume: pmtu 1500 hops 5 back 6 

From DE host (Berlin)   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]                        0.021ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.734ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.664ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.992ms 
 3:  hurricane-electric.bcix.de                           17.032ms asymm  6 
 4:  no reply
 5:  be47.core1.prg1.he.net                               16.346ms asymm  6 
 6:  be8.core4.fra1.he.net                                17.807ms asymm  5 
 7:  be10.core1.zrh2.he.net                               22.859ms asymm  6 
 8:  be1.core1.mil2.he.net                                25.296ms asymm  7 
 9:  no reply
10:  2001:7f8:5f:ffff::73                                 26.099ms asymm 12 
11:  2a11:d2c0::2                                         25.821ms reached
     Resume: pmtu 1500 hops 11 back 13 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.012ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.312ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.278ms 
 2:  eth1-0-12-h5594.edge5-dus1.bb.wiit.network            1.176ms 
 3:  no reply
 4:  lag30.core3-dus1.bb.wiit.network                      0.446ms 
 5:  lag0-vl1011.core1-fra-ix.bb.wiit.network              4.531ms 
 6:  lag0-vl1001.core1-nbg-ncd.bb.wiit.network             7.068ms 
 7:  lag0-vl6.core2-nbg-ncd.bb.wiit.network                7.164ms 
 8:  lag0-vl1006.core2-muc2.bb.wiit.network                9.667ms 
 9:  lag0-vl1009.core1-muc-eq3.bb.wiit.network            10.098ms 
10:  lag0-vl1001.core1-pda-vsix.bb.wiit.network           20.411ms 
11:  lag0-vl1001.core1-mil-mix.bb.wiit.network            20.462ms asymm  9 
12:  flynet-AS207054-v6.mix-it.net                        20.368ms asymm 10 
13:  2a0b:1a00:5:2::1                                     23.751ms asymm 11 
14:  2a11:d2c0::2                                         35.294ms reached
     Resume: pmtu 1500 hops 14 back 12 

From NL host (go6lab)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 1500
 1:  2a00:8642:42::2                                       1.807ms 
 1:  2a00:8642:42::2                                       2.186ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      6.540ms 
 4:  2a03:3f40::10:41                                      5.696ms 
 5:  2001:b28:3ff::1b1b:0:1                               29.266ms 
 6:  be6.core4.fra1.he.net                                31.777ms asymm  4 
 7:  be10.core1.zrh2.he.net                               34.832ms asymm  5 
 8:  be1.core1.mil2.he.net                                40.331ms asymm  6 
 9:  no reply
10:  2001:7f8:5f:ffff::73                                 44.269ms asymm  8 
11:  2a0b:1a00:5:2::1                                     42.076ms asymm  8 
12:  2a11:d2c0::2                                         41.462ms reached
     Resume: pmtu 1500 hops 12 back 9 

From ITA host (Karsolink)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.088ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                0.748ms 
 3:  2a12:d8c0:101f:103::1                                 8.851ms 
 4:  2001:7f8:b9::31:1                                    13.267ms 
 5:  2a11:d2c0::2                                         12.983ms reached
     Resume: pmtu 1500 hops 5 back 5 

From SLO host (6connect)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

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]                        0.022ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.612ms 
 1:  fw1-lju.6connect.com                                  0.597ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.043ms 
 4:  2a03:a100:0:201:1::1                                  2.531ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                1.876ms 
 5:  no reply
 6:  port-channel1.core1.zag2.he.net                       4.424ms 
 7:  no reply
 8:  dbnetwork.topix.it                                   16.126ms 
 9:  2a11:d2c0::2                                         16.407ms reached
     Resume: pmtu 1500 hops 9 back 9 

From SLO host (T-2)   openRFC 4890 ✓

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

Path (traceroute + mtr + PTR)

tracepath -6

 1?: [LOCALHOST]                        0.014ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       3.764ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.830ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        3.517ms asymm  3 
 5:  port-channel1.core1.zag2.he.net                       9.972ms asymm  7 
 6:  port-channel1.core1.zag2.he.net                       9.916ms asymm  7 
 7:  flynet-AS207054-v6.mix-it.net                        24.933ms asymm  6 
 8:  flynet-AS207054-v6.mix-it.net                        24.283ms asymm  6 
 9:  2a0b:1a00:5:2::1                                     19.471ms asymm  7 
10:  2a11:d2c0::2                                         20.474ms reached
     Resume: pmtu 1500 hops 10 back 8