Date: Thu, 21 Feb 2002 10:00:33 +0000 From: Adrian Wontroba <aw1@stade.co.uk> To: All Mail <lists@jeff.ath.cx> Cc: freebsd-stable@freebsd.org Subject: ICMP_BANDLIM and flood pings (was Re: your mail) Message-ID: <20020221100033.A9190@titus.hanley.stade.co.uk> In-Reply-To: <Pine.BSF.4.43.0202081631290.35890-100000@jeff.ath.cx>; from lists@jeff.ath.cx on Fri, Feb 08, 2002 at 04:33:58PM -0500 References: <Pine.BSF.4.43.0202081631290.35890-100000@jeff.ath.cx>
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On Fri, Feb 08, 2002 at 04:33:58PM -0500, All Mail wrote: > I have upgraded to 4.5 and I'm noticing the following: > # 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? You probably have ICMP_BANDLIM defined in your kernel, and are getting messages like this on the console too: Limiting icmp ping response from 249 to 200 packets per second From LINT: # ICMP_BANDLIM enables icmp error response bandwidth limiting. You # typically want this option as it will help protect the machine from # D.O.S. packet attacks. # options ICMP_BANDLIM Don't worry about it. It is _supposed_ to do that (8-) -- Adrian Wontroba To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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