Hi! Did you finally write a script for dead gateway detection beyond first hop? Did you find any other solution to this problem? I'm quite interested and I bet other multipath users here are interested too. My linux router has 10 dsl links (adding 15 more in short), when one of the dsl routers goes down the kernel does not always notice. Don't know why. Also, if a dsl route is up but the internet link is down dead gateway detection doesn't work either. Thanks! Edu On 1/26/06, Manish Kathuria <manish@xxxxxxxxxxxx> wrote: > Hello, > > I have configured a load balancing router using Julian's patches and as > described in "nano.txt" for two ISP links as shown below. > > > > ISP 1 ISP 2 > . . > | | > | | > | | > | WAN WAN | > +-\-+ +-\-+ > | | | | > |R1 | GW1 GW2 |R2 | > | |------. --------| | > | | | | | | > +---+ | | +---+ > EXT1 | | EXT2 > +\----\-+ > | | > | LINUX | > | ROUTER| > | | > | | > | | > +---/---+ > | INT IF > | > | > | > /----------------\ > | LAN | > | | > \----------------/ > > > LAN NETWORK = 192.168.100.0/24 > INT IF = 192.168.100.1 > > ISP1 NETWORK = 10.20.30.128/29 > R1 - ROUTER1 > GW1 = 10.20.30.129 > EXT1 = 10.20.30.130 > > ISP2 NETWORK = 172.16.32.128/29 > R2 - ROUTER2 > GW2 = 172.16.32.129 > EXT2 = 172.16.32.130 > > Both the ISPs have provided /29 subnets of Public IPs. The above > mentioned addresses are just for example. > > The gateways for both the ISPs are routers placed at the same location > which are further connected through Radio Link and Leased Line. > > Things work fine as long as both the ISP links are alive. While testing > the dead gateway detection and failover functionality we observed that > if we make the first hop gateway (i.e Router R1 or R2) of one of the > ISPs dead by either disconnecting the ethernet cable between Linux > Router and R1/R2 or by switching off the gateway (R1/R2) itself, dead > gateway detection takes place and failover to the other ISP takes place. > However, if there is a problem in the ISP connectivity at any of the > subsequent hops, there is no dead gateway detection and failover also > does not take place. I have tested this on various linux kernels from > 2.4 as well as 2.6 series. > > Somehow I have never faced a similar problem before and things have been > working perfectly. In real life situation here, the first hop gateway is > rarely going to be down so dead gateway detection and failover is going > to be required whenever there is some connectivity problem at any of the > later hops. So that's where dead gateway detection needs to work. > > What could be the reason ? How can this be resolved ? I would appreciate > any pointers or suggestions. > > Thanks, > > Manish Kathuria > _______________________________________________ > LARTC mailing list > LARTC@xxxxxxxxxxxxxxx > http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc > _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
