nanog mailing list archives
Re: icmp rpf
From: virendra rode // <virendra.rode () gmail com>
Date: Sun, 24 Sep 2006 16:25:50 -0700
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Mark Kent wrote:
A smaller North American network provider, with a modest North American backbone, numbers their internal routers on public IP space that they do not announce to the world. One of the largest North American network providers filters/drops ICMP messages so that they only pass those with a source IP address that appears in their routing table. As a result, traceroutes from big.net into small.net have numerous hops that time out. Traceroutes from elsewhere that go into small.net but return on big.net also have numerous hops that time out. We do all still think that traceroute is important, don't we? If so, which of these two nets is unreasonable in their actions/policies? Please note that we're not talking about RFC1918 space, or reserved IP space of any kind. Also, think about the scenario where some failure happens leaving big.net with an incomplete routing table, thus breaking traceroute when it is perhaps most needed. Thanks, -mark
- -------------------------- This is yet another reason one shouldn't rely on pings & traceroutes to perform reachability analysis. regards, /virendra -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFFxP+pbZvCIJx1bcRAnN8AJ0VqiwhNkxUm5MxG8p/hLptiJ1IdQCg7wIB nx2woHkYDzu1+7MBdnOZaEw= =mlPK -----END PGP SIGNATURE-----
Current thread:
- icmp rpf Mark Kent (Sep 24)
- Re: icmp rpf Mark Smith (Sep 24)
- Re: icmp rpf Michael . Dillon (Sep 25)
- Re: icmp rpf virendra rode // (Sep 24)
- Re: icmp rpf Mark Kent (Sep 24)
- Re: icmp rpf Roland Dobbins (Sep 24)
- Re: icmp rpf virendra rode // (Sep 24)
- Re: icmp rpf Mark Smith (Sep 25)
- Re: icmp rpf Mark Kent (Sep 25)
- Re: icmp rpf Chris Adams (Sep 25)
- Re: icmp rpf william(at)elan.net (Sep 25)
- Re: icmp rpf Tony Rall (Sep 26)
- Re: icmp rpf Jared Mauch (Sep 26)
- Re: icmp rpf Mark Kent (Sep 24)
- Re: icmp rpf Bill Stewart (Sep 27)
- Re: icmp rpf Mark Smith (Sep 24)