IPV6 connectivity to fireball.acr.fi is failing inside Cogent AS174. I
have already contacted the Cogent NOC, but I haven't heard anything back
yet. I'm wondering if somebody else with Cogent IPV6 connectivity can
run some tests. IPV4 connectivity is working fine.
IPV6 connectivity to fireball.acr.fi is failing inside Cogent AS174. I
have already contacted the Cogent NOC, but I haven't heard anything back
yet. I'm wondering if somebody else with Cogent IPV6 connectivity can
run some tests. IPV4 connectivity is working fine.
It works from AS2547 through Cogent:
PING6(56=40+8+8 bytes) 2001:738:2001:2001::c --> 2001:1bc8:100d::2
16 bytes from 2001:1bc8:100d::2, icmp_seq=0 hlim=52 time=57.356 ms
16 bytes from 2001:1bc8:100d::2, icmp_seq=1 hlim=52 time=57.499 ms
16 bytes from 2001:1bc8:100d::2, icmp_seq=2 hlim=52 time=57.889 ms
^C
--- fireball.acr.fi ping6 statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 57.356/57.581/57.889/0.225 ms
traceroute6 to fireball.acr.fi (2001:1bc8:100d::2) from
2001:738:2001:2001::c, 64 hops max, 12 byte packets
1 vl100.taz.net.bme.hu 0.730 ms 0.389 ms 0.369 ms
2 tg0-1-0-1.rtr.bme.hbone.hu 1.116 ms 0.839 ms 0.590 ms
3 * * *
4 2001:978:2:27::7:1 1.227 ms 0.979 ms 0.942 ms
5 * * *
6 * * *
7 * * *
8 * * *
9 * * *
10 * * *
11 * * 2001:978:2:3f::6 46.962 ms
12 2001:1bc8:1:7:0:d:0:1 47.060 ms * 47.309 ms
13 2001:1bc8:100:100:5::2 55.083 ms !N 54.830 ms !N 62.167 ms !N
$ telnet -6 fireball.acr.fi 80
Trying 2001:1bc8:100d::2...
Won't send login name and/or authentication information.
Connected to fireball.acr.fi.
Escape character is '^]'.
GET
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András
From AS54054 in Ashburn, VA I can ping your address but traceroute's
aren't making it through.
Andrew
Andrew Fried
andrew.fried@gmail.com
I can reach fireball.acr.fi on TCP port 80 so it looks like Cogent is
just filtering or dropping IPV6 traceroute packets.
Thanks for checking connectivity from other locations.
All good from AS4307 via Cogent:
Sending 20, 100-byte ICMP Echos to 2001:1BC8:100D::2, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (20/20), round-trip min/avg/max = 200/203/204 ms
Traceroutes fail altogether.
"Traceroute packets" is extremely vague. As a general rule, if you
want to discover a complete path between endpoints that are expected
to communicate using 80/tcp, trace the route using 80/tcp.
(Not that it's ever expected to see protocol-specific drops in a core
or across a transit or peering edge.)
Joe
I should have stated that I tried icmpv6, UDP, and TCP traceroute with
the same results. Looks like Cogent is not returning TTL expired IPV6
packets within their core. I can only guess that this is a result of
using 6PE and propagating the IPV6 TTL into MPLS.
Clinton