nanog mailing list archives
Large RTT or Why doesn't my ping traffic get discarded?
From: Jason Iannone <jason.iannone () gmail com>
Date: Wed, 21 Dec 2022 11:10:13 -0600
Here's a question I haven't bothered to ask until now. Can someone please help me understand why I receive a ping reply after almost 5 seconds? As I understand it, buffers in SP gear are generally 100ms. According to my math this round trip should have been discarded around the 1 second mark, even in a long path. Maybe I should buy a lottery ticket. I don't get it. What is happening here? Jason 64 bytes from 4.2.2.2: icmp_seq=392 ttl=54 time=4834.737 ms 64 bytes from 4.2.2.2: icmp_seq=393 ttl=54 time=4301.243 ms 64 bytes from 4.2.2.2: icmp_seq=394 ttl=54 time=3300.328 ms 64 bytes from 4.2.2.2: icmp_seq=396 ttl=54 time=1289.723 ms Request timeout for icmp_seq 400 Request timeout for icmp_seq 401 64 bytes from 4.2.2.2: icmp_seq=398 ttl=54 time=4915.096 ms 64 bytes from 4.2.2.2: icmp_seq=399 ttl=54 time=4310.575 ms 64 bytes from 4.2.2.2: icmp_seq=400 ttl=54 time=4196.075 ms 64 bytes from 4.2.2.2: icmp_seq=401 ttl=54 time=4287.048 ms 64 bytes from 4.2.2.2: icmp_seq=403 ttl=54 time=2280.466 ms 64 bytes from 4.2.2.2: icmp_seq=404 ttl=54 time=1279.348 ms 64 bytes from 4.2.2.2: icmp_seq=405 ttl=54 time=276.669 ms
Current thread:
- Large RTT or Why doesn't my ping traffic get discarded? Jason Iannone (Dec 21)
- Re: Large RTT or Why doesn't my ping traffic get discarded? Mel Beckman (Dec 21)
- Re: Large RTT or Why doesn't my ping traffic get discarded? Mel Beckman (Dec 21)
- Re: Large RTT or Why doesn't my ping traffic get discarded? William Herrin (Dec 21)
- Re: Large RTT or Why doesn't my ping traffic get discarded? Dave Taht (Dec 21)
- Re: Large RTT or Why doesn't my ping traffic get discarded? William Herrin (Dec 21)
- Re: Large RTT or Why doesn't my ping traffic get discarded? J. Hellenthal via NANOG (Dec 21)
- Re: Large RTT or Why doesn't my ping traffic get discarded? Dave Taht (Dec 21)
- Re: Large RTT or Why doesn't my ping traffic get discarded? Joelle Maslak (Dec 21)
- RE: Large RTT or Why doesn't my ping traffic get discarded? Jerry Cloe (Dec 21)
- Re: Large RTT or Why doesn't my ping traffic get discarded? Saku Ytti (Dec 21)
- Re: Large RTT or Why doesn't my ping traffic get discarded? William Herrin (Dec 21)
- Re: Large RTT or Why doesn't my ping traffic get discarded? Saku Ytti (Dec 21)
(Thread continues...)
- Re: Large RTT or Why doesn't my ping traffic get discarded? Mel Beckman (Dec 21)