Re: Bug with IP forwarding on dummy interface ?

Thomas Speck (Thomas.Speck@univ-rennes1.fr)
Tue, 19 Oct 1999 13:30:20 +0000 ( )

>
> But then if I remove the dummy0 interface by
>
> /sbin/ifconfig dummy0 down
>
> for example, I should not be able to telnet 192.168.65.1 anymore ?
> Or it still works ! Moreover, I can remove the dummy.o module by

First it hasn't to do with forwarding. Try:

PC-ThS:[~]# ifconfig dummy0 192.168.65.1
PC-ThS:[~]# ping -c 1 192.168.65.1
PING 192.168.65.1 (192.168.65.1): 56 data bytes
64 bytes from 192.168.65.1: icmp_seq=0 ttl=255 time=0.5 ms

--- 192.168.65.1 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 0.5/0.5/0.5 ms
PC-ThS:[~]# ifconfig dummy0 down
PC-ThS:[~]# ping -c 1 192.168.65.1
PING 192.168.65.1 (192.168.65.1): 56 data bytes
64 bytes from 192.168.65.1: icmp_seq=0 ttl=255 time=0.5 ms

--- 192.168.65.1 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 0.5/0.5/0.5 ms

This applies to all network interfaces I have tested so far (eth0, ppp0)
and this problem also has been reported several times to this list. I
think there is a workaround with a shell script somewhere, but I forgot
how it worked. Anyway, I also consider this as a bug but people have
decided it isn't as far as I remember.

BTW, I am using 2.2.13pre17.

--
Thomas




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