[GTALUG] IP mystery

[Darryl Moore]

Hello LUGgers.

Here is an interesting mystery for anyone interesting. I'd love if 
anyone could explain it. The following is cut and paste directly from my 
bash session and not edited in anyway. What the $*#$^ is going on here?

I have reset all the routers between these two machines in case somehow 
they were responding to ARP requests instead of the target machine. I've 
done everything except for resetting the target itself. Also I have a 
daemon on the target which is doing 'C' system calls with 
getifaddrs(&ifap) library calls and it reports back both 192.168.11.50 
and 192.168.11.133 even though ifconfig does not.

Anybody have a clue what is going on here?

cheers,
Darryl

----------------------------------






darryl at darryl-Aspire-V3-575:~$
darryl at darryl-Aspire-V3-575:~$
darryl at darryl-Aspire-V3-575:~$
darryl at darryl-Aspire-V3-575:~$ ssh root at 192.168.11.133
Warning: Permanently added '192.168.11.133' (ECDSA) to the list of known 
hosts.
Welcome to Ubuntu 16.04 LTS (GNU/Linux 4.4.0-64-generic i686)

  * Documentation:  https://help.ubuntu.com/

658 packages can be updated.
406 updates are security updates.

New release '18.04.2 LTS' available.
Run 'do-release-upgrade' to upgrade to it.


You have new mail.
Last login: Thu Feb 21 14:45:01 2019 from 192.168.11.127
root at elp123456:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:f1:f3:8f:05:7d
           inet addr:192.168.11.50  Bcast:192.168.11.255  Mask:255.255.254.0
           inet6 addr: fe80::2f1:f3ff:fe8f:57d/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:1269911 errors:0 dropped:1065 overruns:0 frame:0
           TX packets:682949 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:214230001 (214.2 MB)  TX bytes:129622352 (129.6 MB)

eth0:2    Link encap:Ethernet  HWaddr 00:f1:f3:8f:05:7d
           inet addr:192.168.9.1  Bcast:192.168.9.255  Mask:255.255.255.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

lo        Link encap:Local Loopback
           inet addr:127.0.0.1  Mask:255.0.0.0
           inet6 addr: ::1/128 Scope:Host
           UP LOOPBACK RUNNING  MTU:65536  Metric:1
           RX packets:2264301 errors:0 dropped:0 overruns:0 frame:0
           TX packets:2264301 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1
           RX bytes:1188627720 (1.1 GB)  TX bytes:1188627720 (1.1 GB)

tun0      Link encap:UNSPEC  HWaddr 
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
           inet addr:10.8.1.245  P-t-P:10.8.1.245  Mask:255.255.0.0
           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
           RX packets:214252 errors:0 dropped:0 overruns:0 frame:0
           TX packets:214990 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:100
           RX bytes:12935258 (12.9 MB)  TX bytes:69517662 (69.5 MB)

root at elp123456:~#