nanog mailing list archives
Re: Access to the Internic Blocked
From: Vadim Antonov <avg () quake net>
Date: Thu, 22 Aug 1996 19:10:21 -0700
Vince Fuller wrote:
You'll also need to pursuade your router vendor to violate the ICMP spec, which says that ICMP error messages (i.e. TTL exceeded) are never sent in response to ICMP messages...
I suspect that this restriction is precisely the reason that "traceroute" uses high-port UDP packets.
That is correct. (There are other reasons, too). However, sending ICMP errors in response on ICMP ECHO Request is safe. Unlike sending random UDP messages to random ports. Maybe ICMP specs should be updated and this is the rare case when Microsoft got it right (in spirit, if not letter). --vadim - - - - - - - - - - - - - - - - -
Current thread:
- Re: Access to the Internic Blocked, (continued)
- Re: Access to the Internic Blocked Curtis Villamizar (Aug 22)
- Re: Access to the Internic Blocked Geoff Huston (Aug 21)
- Re: Access to the Internic Blocked John Hawkinson (Aug 21)
- Re: Access to the Internic Blocked John Hawkinson (Aug 21)
- Re: Access to the Internic Blocked Vince Fuller (Aug 22)
- Re: Access to the Internic Blocked Vadim Antonov (Aug 22)
- Re: Access to the Internic Blocked Vadim Antonov (Aug 22)
- Re: Access to the Internic Blocked Curtis Villamizar (Aug 22)
- Re: Access to the Internic Blocked Avi Freedman (Aug 23)
- Re: Access to the Internic Blocked Curtis Villamizar (Aug 23)
- Re: Access to the Internic Blocked Curtis Villamizar (Aug 22)
- Re: Access to the Internic Blocked Vadim Antonov (Aug 22)
- Re: Access to the Internic Blocked Vadim Antonov (Aug 22)
- Re: Access to the Internic Blocked Michael Dillon (Aug 22)
- Re: Access to the Internic Blocked Curtis Villamizar (Aug 23)
- Re: Access to the Internic Blocked Vadim Antonov (Aug 23)
- Re: Access to the Internic Blocked Vadim Antonov (Aug 23)
- Re: Access to the Internic Blocked Daniel W. McRobb (Aug 25)
- Re: Access to the Internic Blocked Curtis Villamizar (Aug 26)
- Re: Access to the Internic Blocked Daniel W. McRobb (Aug 25)
- Re: Access to the Internic Blocked Mike Trest (Aug 23)
- Re: Access to the Internic Blocked Jim Hughes (Aug 28)
- Re: Access to the Internic Blocked Hank Nussbacher (Aug 24)