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[SOLVED]Desktop inet address changed while unattended
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roki942
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Joined: 18 Apr 2005
Posts: 285
Location: Seattle

PostPosted: Mon Sep 28, 2015 6:11 pm    Post subject: [SOLVED]Desktop inet address changed while unattended Reply with quote

This is the 2nd time it's happend (in the past month) and as as it's someting I don't understand it has me a bit freaked.

Yesterday my deskktop was 192.168.1.100 and my netbook was 192.168.1.101.
Was sshed into the netbook from the desktop and runing a distccd update.
This morning the xterm with the ssh session was not responding (couldn't even type into it)

My netbook is now 192.168.1.103

Desktop is
Code:
me@Desktop ~ $ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.45.145  netmask 255.255.0.0  broadcast 169.254.255.255
        ether 00:1c:c0:1f:23:b2  txqueuelen 1000  (Ethernet)
        RX packets 5771257  bytes 8257453099 (7.6 GiB)
        RX errors 0  dropped 102  overruns 0  frame 0
        TX packets 3054705  bytes 292202567 (278.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 20  memory 0xe1480000-e14a0000 

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        loop  txqueuelen 0  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

and my router is showing my desktop connected as 192.168.1.100

The last dmesg entry is
Code:

[100876.032397] Chrome_ChildThr[23250]: segfault at 0 ip 000000000040970f sp 00007feef4ffe510 error 6 in plugin-container[400000+5a000]
[101728.653336] Chrome_ChildThr[23658]: segfault at 0 ip 000000000040970f sp 00007f22f1cfe510 error 6 in plugin-container[400000+5a000]
[105853.158564] nf_conntrack: automatic helper assignment is deprecated and it will be removed soon. Use the iptables CT target to attach helpers instead.
[132616.743528] e1000e: eth0 NIC Link is Down
[132619.170942] e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: Rx/Tx


My rc.log is empty with a last modified time of 3:10:01 am
rc.log-20150927,gz has a last entry of
Code:
rc default logging stopped at Thu Sep 24 10:15:53 2015


As this is all a bit over my head I'd really appeciate some help in figuring it out.

Thanks


Last edited by roki942 on Tue Sep 29, 2015 11:06 pm; edited 1 time in total
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kikko
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Joined: 29 Apr 2014
Posts: 261
Location: Milan, IT

PostPosted: Mon Sep 28, 2015 8:00 pm    Post subject: Reply with quote

Hi roki942
surely that's weird.... Desktop address is in APIPA range, is that configured in your "/etc/conf.d/net"?
Anyway do you have an idea of what time the disconnection happened (may I suggest you to run a "dmesg -T", to display times in a human readable format)
It maybe related to DHCP leases, do you use it in your network?
Last but not least, does syslog logs says something?

I hope these suggestions could help you in your troubleshooting
Regards
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 44230
Location: 56N 3W

PostPosted: Mon Sep 28, 2015 9:34 pm    Post subject: Reply with quote

kikko,

Code:
$ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.45.145  netmask 255.255.0.0  broadcast 169.254.255.255
it looks like the linx wend down and stayed down long enough for dhcpcd to time out and help itself to a link local address.

dmesg may show the link gowing down.

That you get new IP addresses suggests that your router has lost track of address assignments.
Did it power cycle?
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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roki942
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Joined: 18 Apr 2005
Posts: 285
Location: Seattle

PostPosted: Tue Sep 29, 2015 5:02 am    Post subject: Reply with quote

So the link did go down
Code:
[Mon Sep 28 09:48:51 2015] e1000e: eth0 NIC Link is Down
[Mon Sep 28 09:48:54 2015] e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: Rx/Tx
[Mon Sep 28 09:48:54 2015] e1000e 0000:00:19.0 eth0: 10/100 speed: disabling TSO


I left /etc/conf.d/net as it was so nothing there.

I don't know if it powered off or not.

What I still find confusing is why the router's DHCP client table still showed the ip as being 192.168.1.100.
Guess I don't understand how it would lose track.

Thanks
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kikko
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Joined: 29 Apr 2014
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Location: Milan, IT

PostPosted: Tue Sep 29, 2015 7:46 am    Post subject: Reply with quote

Hi roki942
Maybe that is the address you router has leased for the client, but if dhcp daemon in your client client has timed out that address hasn't been applied
Regards
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roki942
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Location: Seattle

PostPosted: Tue Sep 29, 2015 11:06 pm    Post subject: Reply with quote

Thanks kikko & Neddy!

I've added this to my list of things to learn/explore :)
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