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Date:      Fri, 8 Feb 2002 17:00:10 -0500 (EST)
From:      Joe Clarke <marcus@marcuscom.com>
To:        All Mail <lists@jeff.ath.cx>
Cc:        freebsd-stable@FreeBSD.ORG
Subject:   Re: Packet loss to localhost?
Message-ID:  <20020208165824.V67438-100000@shumai.marcuscom.com>
In-Reply-To: <Pine.BSF.4.43.0202081641580.35930-100000@jeff.ath.cx>

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On Fri, 8 Feb 2002, All Mail wrote:

> Hello,
>
> I've noticed this problem since upgrading to 4.5.
>
> # ping -f localhost
> PING localhost (127.0.0.1): 56 data bytes
> ..............................................................................
> ..............................................................................
> ..............................................................................
> ..............................................................................
> ..............................................................................
> ..............................................................................
> ..............................................................................
> ..............................................................................
> ..............................................................................
> ....................................^C
> --- localhost ping statistics ---
> 3738 packets transmitted, 3000 packets received, 19% packet loss
> round-trip min/avg/max/stddev = 0.008/0.013/0.399/0.024 ms
>
> It doesn't seem to matter how big the packets are either.  Anyone know
> what might cause this packet loss?

tail /var/log/messages, and I'll bet you see something like:

Feb  8 16:57:56 nms-server2 /kernel: Limiting icmp ping response from 249
to 200 packets per second

This is a nice little feature that makes FreeBSD less-susceptible to ICMP
attacks.  The kernel option

options     ICMP_BANDLIM

Controls this, and the sysctl variable net.inet.icmp.icmplim lets you tune
the throttle rate.

Joe

>
> Jeff
>
>
>
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