From owner-freebsd-stable Fri Feb 8 14: 0: 1 2002 Delivered-To: freebsd-stable@freebsd.org Received: from shumai.marcuscom.com (rdu57-28-046.nc.rr.com [66.57.28.46]) by hub.freebsd.org (Postfix) with ESMTP id 32E6937B417 for ; Fri, 8 Feb 2002 13:59:56 -0800 (PST) Received: from localhost (marcus@localhost) by shumai.marcuscom.com (8.11.6/8.11.6) with ESMTP id g18M0A477385; Fri, 8 Feb 2002 17:00:10 -0500 (EST) (envelope-from marcus@marcuscom.com) X-Authentication-Warning: shumai.marcuscom.com: marcus owned process doing -bs Date: Fri, 8 Feb 2002 17:00:10 -0500 (EST) From: Joe Clarke To: All Mail Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Packet loss to localhost? In-Reply-To: Message-ID: <20020208165824.V67438-100000@shumai.marcuscom.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG 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 > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message