nanog mailing list archives
Re: Large RTT or Why doesn't my ping traffic get discarded?
From: Dave Taht <dave.taht () gmail com>
Date: Wed, 21 Dec 2022 13:19:54 -0800
There's this thing called bufferbloat... On Wed, Dec 21, 2022 at 11:58 AM William Herrin <bill () herrin us> wrote:
On Wed, Dec 21, 2022 at 9:10 AM Jason Iannone <jason.iannone () gmail com> wrote: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? 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 msHi Jason, This usually means a problem on the Linux machine originating the packet. It has lost the ARP for the next hop or something similar so the outbound ICMP packet is queued. The glitch repairs itself, briefly, releasing the queued packets. Then it comes right back. Regards, Bill Herrin -- For hire. https://bill.herrin.us/resume/
-- This song goes out to all the folk that thought Stadia would work: https://www.linkedin.com/posts/dtaht_the-mushroom-song-activity-6981366665607352320-FXtz Dave Täht CEO, TekLibre, LLC
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)
- 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)
- 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? Masataka Ohta (Dec 22)
- Re: Large RTT or Why doesn't my ping traffic get discarded? Jason Iannone (Dec 22)