[Mageia-discuss] Odd entry in log file

imnotpc imnotpc at Rock3d.net
Tue May 8 21:33:29 CEST 2012

On 05/08/2012 02:20 PM, Frank Griffin wrote:
> On 05/08/2012 08:30 AM, imnotpc wrote:
>> Yes, that was a typo. is correct. But the wireless 
>> router has to NAT those addresses to or no traffic 
>> would get through. In order for the martian packets to be coming from 
>> the wireless router then it would have to be selectively NATing some 
>> packets and not others.
> Now that's interesting.  In my own setup, I simply use the router as a 
> wireless access point, and I disable its DHCP server so as to use the 
> one on my gateway.  I've just verified with wireshark on my gateway 
> that the router isn't NATing anything; all packets from my wireless 
> systems show up at the gateway with their assigned 
> addresses.
> Maybe the router doesn't NAT unless the wireless node has an IP 
> address that it assigned.  Is perhaps a fixed IP address 
> that one of your wireless systems is using ?

No, I don't set any fixed IPs in the subnets that use DHCP although I 
believe the wireless router would allow me to. Also the 192.168.3.x 
address changes. I get martian logs from other addresses in that subnet 
but they are always low numbers which makes me think they were actually 
assigned by the router, at least initially. I haven't had time to run 
tcpdump yet but my current theory is that the wireless router doesn't or 
can't NAT certain types of packets and those are triggering the kernel 
log messages. Or perhaps it's only NATing packets from a host with a 
valid DHCP lease and simply forwarding anything else that comes in.

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