nanog mailing list archives
Re: Consumer networking head scratcher
From: William Herrin <bill () herrin us>
Date: Wed, 1 Mar 2017 14:04:07 -0500
On Wed, Mar 1, 2017, at 01:23 PM, Aaron Gould wrote:That's strange... it's like the TTL on all Windows IP packets are decrementing more and more as time goes on causing you to get less and less hops into the internet
Hi Ryan, Windows tracert uses ICMP echo-request packets to trace the path. It expects either an ICMP destination unreachable message or an ICMP echo response message to come back. The final hop in the trace will return an ICMP echo-response or an unreachable-prohibited. The ones prior to the final hop will return an unreachable-time-exceeded if they return anything at all. If the destination does not respond to ping, if those pings are dropped, or if it responds with an unreachable that's dropped you will not receive a response and the tracert will not find its end. That's why you're seeing the "decrementing" behavior you describe. I have no information about whether comcast blocks pings to its routers. Regards, Bill Herrin -- William Herrin ................ herrin () dirtside com bill () herrin us Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
Current thread:
- Consumer networking head scratcher Ryan Pugatch (Mar 01)
- Re: Consumer networking head scratcher Jean-Francois Mezei (Mar 01)
- RE: Consumer networking head scratcher Aaron Gould (Mar 02)
- Re: Consumer networking head scratcher Ryan Pugatch (Mar 01)
- Re: Consumer networking head scratcher William Herrin (Mar 01)
- Re: Consumer networking head scratcher valdis . kletnieks (Mar 01)
- Re: Consumer networking head scratcher Ryan Pugatch (Mar 01)
- Re: Consumer networking head scratcher William Herrin (Mar 01)
- Re: Consumer networking head scratcher Ryan Pugatch (Mar 01)
- Re: Consumer networking head scratcher iamzam () gmail com (Mar 01)
- Re: Consumer networking head scratcher Ryan Pugatch (Mar 01)
- RE: Consumer networking head scratcher Aaron Gould (Mar 02)
- RE: Consumer networking head scratcher Dann Schuler (Mar 02)
- <Possible follow-ups>
- Re: Consumer networking head scratcher Ryan Pugatch (Mar 01)