You should use 'tcpdump -i ppp0' and 'tcpdump -i ppp1' in two different xterms to have a beter understanding as to what (the hell) is going on. Because that light on ppp0 could be your dns lookup or any other unexpected traffic... Take a look at your routing table (again, with solid commands and no lights here and there ;-)... Try to traceroute to tf and ssh hosts and see what first hop you see... Ramin On Sat, Apr 28, 2001 at 05:41:39PM -0400, Jettero Heller wrote: > I'm completely certain. I have lights on both, and made > sure my only traffic was my ssh session. The transmit > lights flash on ppp0 on the way out, and flash on ppp1 on > the way back in. Web traffic only lights up ppp0. > > It's the damn'dest thing I've seen ... I don't even > understand how that works. ;) > > On Sat, Apr 28, 2001 at 03:45:47PM -0400, Ramin Alidousti wrote: > > On Sat, Apr 28, 2001 at 01:53:00PM -0400, Jettero Heller wrote: > > > > > This seems so simple I can't believe it doesn't work yet. > > > I have two modems connected to two ISPs. I route everything > > > through the "fast" one with: > > > ip route default via xxx.xxx.xxx.xxx dev ppp0 > > > > > > Then to the machine I regularly tf and ssh, I add this: > > > ip route tf.tf.tf.tf via xxx.xxx.xxx.xxx dev ppp1 > > > ip route ssh.ssh.ssh.ssh via xxx.xxx.xxx.xxx dev ppp1 > > > > > > The reason I joined this list is that I'd rather do > > > something like this, but I can't get it to work right. > > > > > > ip route add default via xxx.xxx.xxx.xxx dev ppp1 tos 0x10 > > > > > > for i in 22 23 8000; do > > > iptables -t mangle -A PREROUTING -p tcp > > > --dport $i -j TOS --set-tos 0x10; done > > > > > > I would have figured everything for port 22, 23 and 8000 > > > would go out ppp1 and come back ppp1, but I was rather > > > suprised to find that _all_ my traffic goes out ppp0, but > > > the stuff I tagged 0x10 comes back in ppp1?!? > > > > Good question. First of all I'm not sure that TOS would influence the > > routing decision, either on your Linux box or on the routers out there. > > > > The reason that the packets come back on ppp1 is that the source of the > > IP is set to ppp1 (which is weird, when you're saying that the packets > > go out on ppp0 to ISP I, are you sure about this?). Then the returning > > packets which are destined for ppp1 (which belongs to ISP II) will get > > routed on the Internet to ISP II and will be delivered to PPP1. > > > > Again, if you want to route different services through different ISP's > > it is called policy routing. Take a look at the documentation on: > > > > http://kewl.phear.org/policy/ > > > > Or Arthur's answers to the very same questions on this mailing list. > > > > http://mailman.ds9a.nl/pipermail/lartc/2000q4/000091.html > > http://mailman.ds9a.nl/pipermail/lartc/2000q4/000092.html > > http://mailman.ds9a.nl/pipermail/lartc/2000q4/000153.html > > http://mailman.ds9a.nl/pipermail/lartc/2000q4/000156.html > > > > Ramin > > > > > > > > > > > > What am I missing?
