1 Jun 2002 06:00
[zebra 13878] RE: Zebra without any route input?
Ted Mittelstaedt <tedm <at> toybox.placo.com>
2002-06-01 04:00:19 GMT
2002-06-01 04:00:19 GMT
The difficulty with these schemes is determining linkdown state. Even if you put together a Linux box that has 3 NIC's, one to the Cisco 1605, one to the wireless bridge, and one to the internal network, your going to find that neither the wireless bridge nor the Cisco 1605 will ifconfig down their ethernet interfaces if their links go down. Furthermore if the T1 is Frame Relay, you can easily have a situation where LMI does not go down on the T1 but the Telco fardles up the PVC, so even if the Cisco router could be configured to ifconfig down it's interface, the dumb router won't think that the frame circuit went down. These are the kinds of links that OSPF is designed for. Without it your reduced to ugly scripts that probe remote IP numbers periodically in an attempt to determine if remote hosts aren't working. Ted Mittelstaedt tedm <at> toybox.placo.com >-----Original Message----- >From: owner-zebra <at> zebra.org [mailto:owner-zebra <at> zebra.org]On Behalf Of >Steve Mickeler >Sent: Friday, May 31, 2002 7:45 PM >To: zebra <at> zebra.org >Cc: simon <at> paxonet.com >Subject: [zebra 13876] Re: Zebra without any route input? > > > >If this box is linux based, you dont need zebra for this. You can use the >iproute2 utils and create different "weighted" default routes, specifying >a greater weight for the wireless connection and a smaller weight for >the T1 connection. > >A google search should net you some decent examples. > >A quick example using would be: > ># T1 = eth1 / 10.2.2.2 ># wireless = eth0 / 10.1.1.1 > >ip route add default nexthop via 10.2.2.2 dev eth1 weight 1 \ > nexthop via 10.1.1.1 dev eth0 weight 2 > >This should flow all traffic thru 10.1.1.1 as long as its available, using >10.2.2.2 if its not. > > > >On Fri, 31 May 2002, Simon Matthews wrote: > >> I am trying to set up a redundant Internet connections for my company. >> >> We have a T1 connection through a 1605R Cisco router. The Cisco routed is >> configured to broadcast RIP. >> >> We also have a wireless connection that I would like to use as the default >> connection for most traffic. Unfortunately, the ISP controls the router and >> they will not give me RIP, or anything else. >> >> Is there some way I can use a ping command or some other discovery method >> along with zebra to manipulate the routing tables so that if the wireless >> connection goes down, the network switches over to using the T1 connection? >> >> Or should I just use a script to directly manipulate the routing tables and >> not bother with Zebra? >> >> Thanks! >> Simon >> > > > >[-] Steve Mickeler [ steve <at> neptune.ca ] > >[|] Todays root password is brought to you by /dev/random > >[+] 1024D/ACB58D4F = 0227 164B D680 9E13 9168 AE28 843F 57D7 ACB5 8D4F > > >