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<H1>[Mageia-discuss] Odd entry in log file</H1>
<B>imnotpc</B>
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TITLE="[Mageia-discuss] Odd entry in log file">imnotpc at Rock3d.net
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<I>Tue May 8 01:52:02 CEST 2012</I>
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<PRE>On 05/07/2012 04:47 PM, Maarten Vanraes wrote:
><i> Op maandag 07 mei 2012 14:23:44 schreef Frank Griffin:
</I>>><i> On 05/07/2012 06:45 AM, Frank Griffin wrote:
</I>>>>><i> On 05/06/2012 09:15 PM, imnotpc wrote:
</I>>>>><i> 1) Is eth0 the interface facing the internet ?
</I>>>><i> No, this interface faces the LAN which has a 192.168.0.0/24 subnet.
</I>>><i> OK, so if eth0 has no outside internet access, you are correct in saying
</I>>><i> that something in your network is doing this.
</I>>><i>
</I>>>>><i> 2) Is 173.194.74.154 the IP address assigned (currently) to you by
</I>>>>><i> your ISP ?
</I>>>><i> No, that IP returns to qe-in-f154.1e100.net which appears to be a
</I>>>><i> server owned by Google.
</I>>><i> Yes. I thought maybe Google was your ISP.
</I>>><i>
</I>>>>><i> 4) What does "traceroute 192.168.3.2" from the gateway give ?
</I>>>><i> [<A HREF="https://www.mageia.org/mailman/listinfo/mageia-discuss">root at Cedar1</A> /]# traceroute 192.168.3.2
</I>>>><i> traceroute to 192.168.3.2 (192.168.3.2), 30 hops max, 60 byte packets
</I>>>><i>
</I>>>><i> 1 74-94-209-242-BusName-VA.hfc.comcastbusiness.net (74.94.209.242)
</I>>>><i>
</I>>>><i> 0.670 ms 1.372 ms 1.686 ms
</I>>>><i>
</I>>>><i> 2 * * *
</I>>>><i>
</I>>>><i> Well isn't that interesting. That Comcast IP is the address of the ISP
</I>>>><i> gateway I use. Both of my firewall/gateway boxes that are logging
</I>>>><i> martian packets are connected to similar Comcast routers. The routers
</I>>>><i> are configured in bridge mode so the router DHCP service has no effect
</I>>>><i> on my connection, but it might still be active on the router. Also
</I>>>><i> each ISP router also has a wireless interface and that could still be
</I>>>><i> active. My firewall doesn't block any private IPs coming from the
</I>>>><i> Internet interface since the ISP routers would never forward them, so
</I>>>><i> that explains how they get past the firewall.
</I>>><i> No, I think traceroute doesn't special-case internal IP addresses. Your
</I>>><i> routing table is (correctly) set up to route traffic for anything other
</I>>><i> than your known subnets to the external internet, and that's exactly
</I>>><i> what traceroute is doing. It's your ISP's job to discard internal
</I>>><i> address packets, not yours.
</I>>><i>
</I>>><i> But I think you're on to something with the ISP routers. Is there some
</I>>><i> reason you don't just run the cable from the cable modem to the external
</I>>><i> NIC on the gateway PC ? If you're willing to try that, and the martians
</I>>><i> disappear, it's these routers.
</I>>><i>
</I>>><i> Try going into configuration on these routers, and see what their DHCP
</I>>><i> servers are set up for, and whether the 192.168.3 subnet appears
</I>>><i> anywhere in there. It's possible that one of your DHCP-using wireless
</I>>><i> clients is getting an answer to its broadcast from these guys before
</I>>><i> your internal router, and picking up a 192.168.3.2 IP address from them.
</I>><i>
</I>><i> my martians are mostly from: hosts in subnet of my public IP, or internal
</I>><i> ranges from modems, and mostly broadcasts or arp stuff.
</I>><i>
</I>><i> i think this 192.168.3.1 stuff is likely someone in your ISP subnet that is
</I>><i> doing bad natting and is trying to get out (much like you pinging 192.168.3.x
</I>><i> which is going outside your public ip, that'll get martians on someone elses
</I>><i> pc for instance
</I>
Since it seems to be coming in on the LAN facing interface, wouldn't it
be more likely a bad configuration somewhere in my LAN? Everything seems
to point to my cheap Netgear wireless router even though I just
rechecked it and it's configured properly (to the best of my knowledge).
Jeff
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