[CentOS] Modem network card conflict
shawn at tandac.com
Wed Jul 30 14:06:40 UTC 2008
Here's a strange one for you...
I have a Linux box with a PCMCIA adapter PCI card in it. Plugged into said
card is a cellular modem card.
I can configure wvdial and dial the modem card perfectly. My ppp0
interface comes up and I can ping everything.
I also have a network card on the motherboard. Once again, by itself the
network card works correctly. That is with the modem NOT dialed up.
Here's where things get interesting...
If I flush the firewall rules: iptables -F
Bring down the eth0 interface: ifconfig eth0 down
Connect with the modem: wvdial &
Bring up the interface: ifconfig eth0 192.168.7.1
At this point the ppp0 interface drops off and redials. It is no longer
able to maintain a stable connection. ppp0 and eth0 do not use the same
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