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Groups > comp.os.linux.networking > #1821

Re: Iptables or routing issue

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Hello,

Dirk Stöcker a écrit :
> 
> Hardware:
> - one PC running openSUSE
> - multiple serial ports
> - on each serial port is a device with ppp capabilities
>   - hardcoded IPs aren't changeable
>   - device IP is 192.168.171.1
>   - host IP is 192.168.171.2
> 
> Now the problem is that both have same IP setup.
> 
> Solution: Using routing tables and iptables the IP's are mapped into the 
> range 10.0.port.1, where port is the serial port number (or ppp device 
> number).
> 
> Problem:
> For the first connected IP this setup works. For the second IP it seems 
> incominmg packets are lost. I see the packets in "mangle" prerouting, but 
> not in any later step. For the first connecting the are properly handled 
> and delivered.

Check that rp_filter is disabled for the PPP interfaces.
Note that the logic combining net.ipv4.conf.all.rp_filter and
net.ipv4.conf.<interface>.rp_filter has changed at some point of the
kernel development.

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Thread

Iptables or routing issue Dirk Stöcker <news@dstoecker.de> - 2012-11-14 17:44 +0100
  Re: Iptables or routing issue Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-11-16 01:34 +0100
    Re: Iptables or routing issue Dirk Stöcker <news@dstoecker.de> - 2012-11-16 11:35 +0100

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