[GTALUG] IP mystery

Alvin Starr alvin at netvel.net
Thu Feb 21 15:01:43 EST 2019


try running "ip addr"

There are some aliases that will not be reported back by ifconfig.


On 2/21/19 2:55 PM, Darryl Moore via talk wrote:
> 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:~#
> ---
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-- 
Alvin Starr                   ||   land:  (905)513-7688
Netvel Inc.                   ||   Cell:  (416)806-0133
alvin at netvel.net              ||



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