The DNS entry that won't die...

Support section for FREESCO v0.4.x

The DNS entry that won't die...

Postby CDFiXER » Sun Jan 12, 2014 5:15 pm

Was getting lots of failures due to timeouts from the DNS my ISP supplies (known to be poor DNS servers), so I thought I would try Google's DNS servers at 8.8.8.8 and 8.8.4.4. Worked fine, but for whatever reason I decided to go with another DNS service. Changed my secondary and tertiary DNS entries to the new IP's, and they show up and appear to be working. However, now I get logs filled with (at intervals every few minutes, to seconds and sometimes stops for days!?!) :

IP fw-fwd rej eth0 UDP 192.168.231.12:50795 8.8.8.8:53 L=65 S=0x00 I=30113 F=0x0000 T=63

With the IP's of various Android devices on my network. Also see the above with 8.8.4.4. Tried rebooting all devices. Tried removing their connections and re-adding them, no help. Rebooted FREESCO. Looked/searched through FREESCO to find if the old DNS servers somehow did not get removed. Nothing found, the 3 DNS settings are in the cfg file as they should be and survive a reboot. Removed the Google ones using the proper place in Setup.

I suspect this is more a case of the devices not giving up/refreshing ALL of their network data as they should be. I am using DHCP and v0.4.4. Nothing out of the ordinary. Want the report pasted or attached? I do not see a place for an attachment.
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Re: The DNS entry that won't die...

Postby Lightning » Sun Jan 12, 2014 9:59 pm

IP fw-fwd rej eth0 UDP 192.168.231.12:50795 8.8.8.8:53
It is definitely a client behind FREESCO looking for this DNS server. The internal machine at 192.168.231.12 of course a report would tell me if you are running the DNS server in FREESCO in secure mode or not or if all other settings are ok.

As for attachments, there is a tab in the bottom shaded section of posts that shows "upload attachments"
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Re: The DNS entry that won't die...

Postby CDFiXER » Mon Jan 13, 2014 4:21 pm

Yes, running the DNS in secure mode.

As far as I know the settings are all ok, been running this way since 044 came out, well except for a change from dialup perhaps(or was that during 043, lol). This only started when I changed the DNS servers then back. Seems to only be devices I do not have "complete" access to their internal networking setup, such as unrooted Android phones, STB cable boxes, etc.
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Re: The DNS entry that won't die...

Postby Lightning » Tue Jan 14, 2014 12:11 pm

----- cat /etc/dhcpd.leases | sed s/#.*// -----

Hmmm, this is very strange. Even though you have the DHCP server running on FREESCO, it is showing that it has not given any leases out. Which makes me think there is another DHCP server on your system or every machine is hard coded???
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Re: The DNS entry that won't die...

Postby CDFiXER » Tue Jan 14, 2014 6:47 pm

Oh...crud. I THOUGHT I only copied them from the report.txt out to another list. :roll: I wanted to verify some of the MAC addresses to our current devices. Apparently I CUT them instead of copied them. Can I claim "loose nut behind the keyboard"?

There was a number of them. Here they are:

lease 192.168.231.13 {
starts 2 2014/01/14 17:18:11;
ends 3 2014/01/15 11:04:51;
hardware ethernet 00:1a:4d:59:d3:50;
uid 01:00:1a:4d:59:d3:50;
client-hostname "Jason-PC";
}
lease 192.168.231.19 {
starts 2 2014/01/14 16:11:40;
ends 3 2014/01/15 09:58:20;
hardware ethernet 40:0e:85:0c:57:92;
uid 01:40:0e:85:0c:57:92;
client-hostname "android-";
}
lease 192.168.231.23 {
starts 2 2014/01/14 11:30:57;
ends 3 2014/01/15 05:17:37;
hardware ethernet cc:3a:61:12:ff:67;
uid 01:cc:3a:61:12:ff:67;
client-hostname "android-";
}
lease 192.168.231.26 {
starts 2 2014/01/14 08:54:11;
ends 3 2014/01/15 02:40:51;
hardware ethernet 00:0a:97:02:11:37;
}
lease 192.168.231.24 {
starts 2 2014/01/14 08:39:12;
ends 3 2014/01/15 02:25:52;
hardware ethernet 00:0a:97:02:50:d3;
}
lease 192.168.231.12 {
starts 2 2014/01/14 06:20:45;
ends 2 2014/01/14 14:49:05;
hardware ethernet a8:e3:ee:ed:8c:89;
uid 01:a8:e3:ee:ed:8c:89;
}
lease 192.168.231.10 {
starts 2 2014/01/14 11:45:21;
ends 2 2014/01/14 11:47:21;
hardware ethernet 48:5d:60:d8:d9:05;
client-hostname "android-9";
}
lease 192.168.231.14 {
starts 1 2014/01/13 15:51:45;
ends 2 2014/01/14 09:38:25;
hardware ethernet 00:08:ca:c3:b0:41;
client-hostname "android-8";
}
lease 192.168.231.15 {
starts 0 2014/01/12 09:20:55;
ends 1 2014/01/13 03:07:35;
hardware ethernet 7c:dd:90:3d:ac:01;
uid 01:7c:dd:90:3d:ac:01;
}
lease 192.168.231.16 {
starts 0 2014/01/12 06:18:17;
ends 1 2014/01/13 00:04:57;
hardware ethernet 00:c0:9f:6a:1f:10;
uid 01:00:c0:9f:6a:1f:10;
client-hostname "your-b6";
}
lease 192.168.231.18 {
starts 0 2014/01/12 05:51:49;
ends 0 2014/01/12 23:38:29;
hardware ethernet 00:0e:35:b6:1a:37;
uid 01:00:0e:35:b6:1a:37;
client-hostname "your-b6";
}
lease 192.168.231.11 {
starts 6 2014/01/11 18:55:02;
ends 0 2014/01/12 12:41:42;
hardware ethernet 8c:c1:21:04:a5:5f;
uid 01:8c:c1:21:04:a5:5f;
client-hostname "COM-MID1";
}
lease 192.168.231.17 {
starts 0 2014/01/12 05:45:53;
ends 0 2014/01/12 05:45:53;
abandoned;
client-hostname "your-b6";
}
lease 192.168.231.13 {
starts 2 2014/01/14 17:18:14;
ends 3 2014/01/15 11:04:54;
hardware ethernet 00:1a:4d:59:d3:50;
uid 01:00:1a:4d:59:d3:50;
client-hostname "Jason-PC";
}
lease 192.168.231.24 {
starts 2 2014/01/14 17:31:30;
ends 3 2014/01/15 11:18:10;
hardware ethernet 00:0a:97:02:50:d3;
}
lease 192.168.231.24 {
starts 2 2014/01/14 17:32:31;
ends 3 2014/01/15 11:19:11;
hardware ethernet 00:0a:97:02:50:d3;
}
Catapultam habeo.
Nisi pecuniam omnem mihi dabis, ad caput tuum saxum
immane mittam.
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CDFiXER
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Re: The DNS entry that won't die...

Postby CDFiXER » Tue Jan 14, 2014 6:53 pm

You know upon a little more research it appears to be the same two Android devices. They are unrooted and both have been rebooted (multiple times) so not sure how to force them to completely renew their DHCP information.
Catapultam habeo.
Nisi pecuniam omnem mihi dabis, ad caput tuum saxum
immane mittam.
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CDFiXER
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Posts: 380
Joined: Tue Jan 07, 2003 1:45 am

Re: The DNS entry that won't die...

Postby Lightning » Tue Jan 14, 2014 9:49 pm

I wish I could help a bit more, but it seems that DHCP leases and Android devices have a long history of issues and because they are also closely tied with Google it makes me wonder about the Google DNS address.
So at this point the ONLY for absolute certain way to make sure ALL machines update there DHCP leases would be to change the IP subnet of your internal network and clear the /etc/dhcpd.leases and /boot/etc/dhcp.liz file and then reboot the router with the new subnet in place. Although if the Android devices have this IP hard coded in some manor it won't help.
If you are afraid that you might make a mistake. The chances are high that you will never learn anything.
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Re: The DNS entry that won't die...

Postby CDFiXER » Wed Jan 15, 2014 6:52 pm

I will do so this weekend. Thank you Lightning!

If this still happens, I will put in some filtering to kill the crap going into the log.
Catapultam habeo.
Nisi pecuniam omnem mihi dabis, ad caput tuum saxum
immane mittam.
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CDFiXER
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