nanog mailing list archives
Re: operational: icmp echo out of control?
From: Chris Woodfield <rekoil () semihuman com>
Date: Tue, 28 May 2002 13:05:19 -0400
The problem here is that other types of probes raise IDS alarms on way too many networks - the next-best method is to probe HTTP ports, but we don't want to have to pull down thousands of web pages just to get performance stats. So, they send a SYN, wait for the ACK, record the latency and send a FIN. Sounds benign, but you'd be surprised how klaxons go off in response to this. -C
Perhaps most maddening is that ICMP echo/response hardly reflects real-world performance. (At least I don't usually tunnel my HTTP, SMTP, and FTP packets through ICMP, but perhaps I'm just being weird again.)
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Current thread:
- operational: icmp echo out of control? Mark Kent (May 23)
- Re: operational: icmp echo out of control? Clayton Fiske (May 23)
- Re: operational: icmp echo out of control? Bryan Bradsby (May 23)
- Re: operational: icmp echo out of control? Richard A Steenbergen (May 23)
- Re: operational: icmp echo out of control? E.B. Dreger (May 23)
- Re: operational: icmp echo out of control? Mark Kent (May 23)
- Re: operational: icmp echo out of control? Scott Granados (May 23)
- Re: operational: icmp echo out of control? Randy Bush (May 23)
- Re: operational: icmp echo out of control? Chris Woodfield (May 28)
- Re: operational: icmp echo out of control? Kevin Loch (May 28)
- Re: operational: icmp echo out of control? Richard A Steenbergen (May 28)
- Re: operational: icmp echo out of control? E.B. Dreger (May 28)
- Re: operational: icmp echo out of control? Jeff Mcadams (May 28)
- Re: operational: icmp echo out of control? Mike Tancsa (May 28)
- Re: operational: icmp echo out of control? Richard A Steenbergen (May 28)
- Re: operational: icmp echo out of control? Valdis . Kletnieks (May 28)
- Re: operational: icmp echo out of control? John Kristoff (May 28)
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- Re: operational: icmp echo out of control? John Kristoff (May 28)
- Re: operational: icmp echo out of control? E.B. Dreger (May 23)
- IWF was: RE: operational: icmp echo out of control? Deepak Jain (May 28)