nanog mailing list archives
Re: IP over SONET considered harmful?
From: "Sean M. Doran" <smd () clock org>
Date: Sun, 22 Mar 1998 10:48:42 -0800
| Sounds reasonable to me. My point was that decrementing the IP TTL, | whether it be at each LSR or only at egress, should be a decision | that can be made by the provider. Well, in that case you also have to not copy the IP TTL into the tag TTL, but rather synthesize a new tag TTL, assuming the goal is not to end up with traceroute stars. I think this is insane, personally, but then Sprintlink in the past fell victim to devastating forwarding loops, both tight and loose; the latter were particularly bad, and so maybe I am "over sensitive". If you _really_ want to conceal one's network, why not just outright lie -- at your ingress LSR look for packets with low TTLs, and for ones that won't make it to their destinations, synthesize an ICMP time exceeded with your choice of source addresses. (cf the last paragraph of 2.14 in the current MPLS arch draft) Where this is not possible, you generate the lie as close as possible to the point where the ttl timeout would happen. Sean.
Current thread:
- Re: IP over SONET considered harmful?, (continued)
- Re: IP over SONET considered harmful? Vadim Antonov (Mar 20)
- Re: IP over SONET considered harmful? Stan Hanks (Mar 21)
- Re: IP over SONET considered harmful? Vadim Antonov (Mar 21)
- Re: IP over SONET considered harmful? Sean M. Doran (Mar 21)
- Re: IP over SONET considered harmful? Paul Ferguson (Mar 21)
- Re: IP over SONET considered harmful? Sean M. Doran (Mar 21)
- Re: IP over SONET considered harmful? Sean M. Doran (Mar 21)
- Re: IP over SONET considered harmful? Sean M. Doran (Mar 22)
- Re: IP over SONET considered harmful? Sean M. Doran (Mar 22)
- Re: IP over SONET considered harmful? Vadim Antonov (Mar 22)
- Re: IP over SONET considered harmful? Sean M. Doran (Mar 22)
- Re: IP over SONET considered harmful? Mike Trest (In Japan) (Mar 22)
- Re: IP over SONET considered harmful? Peter E. Giza (Mar 23)
- Re: IP over SONET considered harmful? Sean M. Doran (Mar 24)
- Re: IP over SONET considered harmful? Peter Lothberg (Mar 27)