From owner-freebsd-isp Thu Jan 23 05:17:28 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id FAA18455 for isp-outgoing; Thu, 23 Jan 1997 05:17:28 -0800 (PST) Received: from labinfo.iet.unipi.it (labinfo.iet.unipi.it [131.114.9.5]) by freefall.freebsd.org (8.8.5/8.8.5) with SMTP id FAA18442 for ; Thu, 23 Jan 1997 05:17:17 -0800 (PST) Received: from localhost (luigi@localhost) by labinfo.iet.unipi.it (8.6.5/8.6.5) id NAA21897; Thu, 23 Jan 1997 13:31:55 +0100 From: Luigi Rizzo Message-Id: <199701231231.NAA21897@labinfo.iet.unipi.it> Subject: Re: Ping DUP To: rg@gds.de Date: Thu, 23 Jan 1997 13:31:54 +0100 (MET) Cc: freebsd-isp@freebsd.org In-Reply-To: <199701231229.NAA20550@gds.de> from "Richard Gresek" at Jan 23, 97 01:28:00 pm X-Mailer: ELM [version 2.4 PL23] Content-Type: text Sender: owner-isp@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > route add 194.231.79.60 localhost > > Now, when I ping this address from another network every ip-packet > get duplicated: > > PING 194.231.79.60 (194.231.79.60): 56 data bytes > 64 bytes from 194.231.79.60: icmp_seq=0 ttl=251 time=59.921 ms > 64 bytes from 194.231.79.60: icmp_seq=0 ttl=251 time=69.929 ms (DUP!) > 64 bytes from 194.231.79.60: icmp_seq=1 ttl=251 time=60.104 ms > 64 bytes from 194.231.79.60: icmp_seq=1 ttl=251 time=70.113 ms (DUP!) > 64 bytes from 194.231.79.60: icmp_seq=2 ttl=251 time=60.108 ms > 64 bytes from 194.231.79.60: icmp_seq=2 ttl=251 time=70.071 ms (DUP!) > 64 bytes from 194.231.79.60: icmp_seq=3 ttl=251 time=50.142 ms > 64 bytes from 194.231.79.60: icmp_seq=3 ttl=251 time=60.133 ms (DUP!) > ^C --- > 194.231.79.60 ping statistics --- 4 packets transmitted, 4 packets > received, +4 duplicates, 0% packet loss round-trip min/avg/max = > 50.142/62.565/70.113 ms # > > There are no DUPs when pinging from within the same net. > > I did not have this problem with FreeBSD 2.1.5 nor with 3.0 and a > NE2000 clone. > > Could it be a bug in the vx0 driver or did I misconfigure something? most likely you have two paths to/from your host, and either the ping request or the response are duplicated. It i also interesting to note the 10ms difference between the dups -- although I cannot tell where this difference comes from! Luigi -----------------------------+-------------------------------------- Luigi Rizzo | Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it | Universita' di Pisa tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/ _____________________________|______________________________________