tcp/ip connections and downed/removed netdevs

Hi,

I have a rather strange problem in regard to routing and tcp/ip connections.

My setup:
- default route to eth0, metric 2
- ppp dialin to static ip (ppp0), is another default route, metric 0

I open a telnet connection over the ppp0 interface.

I then down and remove the ppp0 interface (ifconfig -a ppp0 shows 'no such device'), the default route over ppp0 is gone.

Symptom:
The telnet connection hangs.

No packets are transmitted over the still alive eth0 defaultroute. tcpdump -i eth0 shows 0 packets, "netstata -a" shows an increasing SendQ on the connection.

If I dialin again, the still hanging packets get transmitted to the target.

I am not sure, but should this be?

Shouldn't packets get routed over eth0 in the case an interface vanishes?

Ciao, Marcus
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No. Look in /etc/ppp/ip_up /etc/ppp/ip_down. Read the docs. These control what gets set/reset when the ppp connection is set up or torn down.

You can configure to do anything you want, including completely reconfiguring your network when a ppp connection is established.

This is not a kernel affair.

Cheers,
Dick Johnson

Penguin : Linux version 2.4.0 on an i686 machine (799.54 BogoMips).

"Memory is like gasoline. You use it up when you are running. Of course you get it all back when you reboot..."; Actual explanation obtained from the Micro$oft help desk.

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