> I'm trying to use diald with ippp. My setup almost works > correctly except > a very boring problem (I'm using kernel 2.4.17). > > For diald to work, the default route is set on the sl0 interface (slip > interface where diald is listening). When diald detects a > correct packet, it > activates the ppp layer and the ippp0 (isdn ppp) goes up. > When the ippp0 > interface goes up, the default route is set to it. > > The problem is the following: > - I ping an.ip.add.ress > - diald sees the packet and activates the ippp0 interface, > and changes the route > to ippp0 > - ping prints > ping: sendto: Invalid argument > ping: sendto: Invalid argument > ping: sendto: Invalid argument > ... > > - I kill ping and restart another one, everything is OK. > > I've tried to see what happens when you are switching routes when an > application is running. And used the following test: > > # run tcpdump -i dummy0 and tcpdump eth0 in other windows > > $ DEST=an.ip.add.rres > $ GW=my_gateway_on_my_eth0 > > $ ifconfig dummy0 10.2.3.4 netmask 255.255.255.0 up > $ route add $DEST dummy0 > $ ping $DEST > -> packets are there, source address from dummy0 > # do not kill the ping !!! > $ route delete $DEST dummy0; route add $DEST gw $GW > -> packets change to eth0, but their source address is not > the one from > eth0, but the one from dummy0 > # kill the ping, restart it -> source address is now OK. > > I thought the kernel whould have rewritten the source > address, when switching > route. > > Is there a solution or a workaround to this problem ? > I use diald because I need complex rules and can't use the > automatic dialup > feature of isdn. I had the same problem with Kmail when I want to send an email (when you read them it doesn't attach an IP to the request, so it doesn't get confused). I asked the Linux-users list about this and the response I got was that it is a known bug, with no known work around that is simple. My plan (not yet implemented) is to replace the send email command (you can replace whatever command you have a problem with) with a script that will ping first (to get the dial to happen), then send the email. You might try something along those lines. In Harmony's Way, and In A Chord, Tom :-}) Thomas A. Condon Barbershop Bass Singer Registered Linux User #154358 - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
