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Re: missing icmp errors for udp packets

To: Pekka Savola <pekkas@xxxxxxxxxx>
Subject: Re: missing icmp errors for udp packets
From: clemens <therapy@xxxxxxxxxxxxx>
Date: Sun, 29 Jul 2001 13:16:15 +0200
Cc: netdev@xxxxxxxxxxx
In-reply-to: <Pine.LNX.4.33.0107290739370.2081-100000@xxxxxxxxxx>
References: <Pine.LNX.4.33.0107290739370.2081-100000@xxxxxxxxxx>
Sender: owner-netdev@xxxxxxxxxxx
User-agent: Mutt/1.3.18i
On Sun, Jul 29, 2001 at 07:57:48AM +0300, Pekka Savola wrote:

> HOWEVER, I noticed that 'nmap -P0' (ie. don't ping first) always works
> without problems!

probably there is a bug in the icmp reply throttling code?

without pinging first, there are icmp replies.
with pinging first, there are no icmp replies.
with pinging and heavy udp scanning, there are a few (throttled) icmp
replies. (try yourself)

seems like the icmpsendingrate isn't resetted below the threshold properly?

clemens

p.s.:
does this somehow explain why this whole issue doesn't apply to the loopback
devices?

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