nanog mailing list archives
Re: large organization nameservers sending icmp packets to dns servers.
From: Valdis.Kletnieks () vt edu
Date: Mon, 06 Aug 2007 13:37:06 -0400
On Mon, 06 Aug 2007 12:13:03 EDT, "Steven M. Bellovin" said:
1) ICMP is handled at the same rate as TCP/UDP packets in all the routers involved (so there's no danger of declaring a path "slow" when it really isn't, just becase a router slow-pathed ICMP).This is aimed at hosts, not routers, right? As far as I know, routers don't slow-path forwarded ICMP. Hosts will probably reply to ICMP from their kernel, so it's a faster response than a user-level DNS reply.
Well, they don't *directly* slow-path it. But we've seen *plenty* of cases of "multi-hop performance as indicated by ICMP Echo Request/Reply doesn't at all match throughput/latency as indicated by TCP-level stats" mentioned on this list...
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- Re: large organization nameservers sending icmp packets to dns servers., (continued)
- Re: large organization nameservers sending icmp packets to dns servers. Chris L. Morrow (Aug 07)
- RE: large organization nameservers sending icmp packets to dns servers. David Schwartz (Aug 07)
- Re: large organization nameservers sending icmp packets to dns servers. Valdis . Kletnieks (Aug 07)
- Re: large organization nameservers sending icmp packets to dns servers. Tony Finch (Aug 08)
- RE: large organization nameservers sending icmp packets to dns servers. william(at)elan.net (Aug 08)
- Re: large organization nameservers sending icmp packets to dns servers. Patrick W. Gilmore (Aug 08)
- Re: large organization nameservers sending icmp packets to dns servers. Stephane Bortzmeyer (Aug 09)
- Re: large organization nameservers sending icmp packets to dns servers. Chris L. Morrow (Aug 10)
- Re: large organization nameservers sending icmp packets to dns servers. Duane Wessels (Aug 06)
- Re: large organization nameservers sending icmp packets to dns servers. Steve Atkins (Aug 06)
- Re: large organization nameservers sending icmp packets to dns servers. Valdis . Kletnieks (Aug 06)
- Re: large organization nameservers sending icmp packets to dns servers. Leigh Porter (Aug 06)
- Re: large organization nameservers sending icmp packets to dns servers. Owen DeLong (Aug 06)
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- Re: large organization nameservers sending icmp packets to dns servers. Valdis . Kletnieks (Aug 06)
- Re: large organization nameservers sending icmp packets to dns servers. Patrick W. Gilmore (Aug 06)