From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guy Van Den Bergh Date: Tue, 29 May 2001 23:24:51 +0000 Subject: Re: [LARTC] Traceroute looks good, but packets destined for wrong MAC Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org I should go to bed, I was not thinking clear either. :( Please ignore my previous message :) Jeffrey W. Baker wrote: > Hello, > > I am a newbie at routing configuration and I hope you can help me > understand why something is happening, and how I can reconfigure my > machine to work correctly. Here is my network setup: > > [DSL Router] [T1 Router] > | |65.198.37.65 > [NAT/firewall] | > |192.168.168.1 | > +-----------+---------+ > | > [switch] > | > | > +-------[Linux box] > 192.168.168.200/eth0 > 65.198.37.66/eth0 > > You can see, I have two IPs of different nets bound to the single > interface in the machine. My goal is to route connections over both the > DSL and the (fractional) T1, preferring the DSL with a 6:1 ratio. > Here is my configuration so far, which mostly works: > > root@windmill:/home/jwb# ip route list > 65.198.37.64/29 dev eth0 proto kernel scope link src 65.198.37.66 > 192.168.168.0/24 dev eth0 proto kernel scope link src 192.168.168.200 > 127.0.0.0/8 dev lo scope link > default > nexthop via 192.168.168.1 dev eth0 weight 6 > nexthop via 65.198.37.65 dev eth0 weight 1 > > root@windmill:/home/jwb# ip route list table 100 > 192.168.168.0/24 dev eth0 scope link > default via 192.168.168.1 dev eth0 > > root@windmill:/home/jwb# ip route list table 200 > 65.198.37.64/29 dev eth0 scope link > default via 65.198.37.65 dev eth0 > > root@windmill:/home/jwb# ip addr list > 1: lo: mtu 16436 qdisc noqueue > link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 > inet 127.0.0.1/8 scope host lo > 2: eth0: mtu 1500 qdisc pfifo_fast qlen 100 > link/ether 00:d0:b7:88:23:d9 brd ff:ff:ff:ff:ff:ff > inet 192.168.168.200/24 brd 192.168.168.255 scope global eth0 > inet 65.198.37.66/29 scope global eth0:t1 > > root@windmill:/home/jwb# ip ru list > 0: from all lookup local > 32764: from 65.198.37.66 lookup 200 > 32765: from 192.168.168.1 lookup 100 > 32766: from all lookup main > 32767: from all lookup 253 > > This mostly works fine, except that a lot of packets are going out over > one link or the other, with the wrong source address. Also traceroute > shows packets going out over the DSL, which actual TCP SYN packets go out > over the T1 with the wrong address. Here is an example: > > traceroute to appwatch.zdnet.com (216.65.128.201), 30 hops max, 40 byte > packets > 1 w145.z064001233.sjc-ca.dsl.cnc.net (64.1.233.145) > 2 w001.z064001104.sjc-ca.dsl.cnc.net (64.1.104.1) > > So the packets should be going out over the DSL. However, ethereal shows > that when I try to initiate a TCP connection, the packets are headed for > the MAC address of corresponding to the T1 router (65.198.37.65). Why > would this discrepancy happen? > > Regards and thanks in advance for any assistance, > Jeffrey Baker > > > _______________________________________________ > LARTC mailing list / LARTC@mailman.ds9a.nl > http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/2.4Routing/ > > > _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/2.4Routing/