Hi, Everybody,
An admin that works with me was trying to remove an alias from an
interface and ended up causing network connectivity on the server to
cease.
I was wondering if the following scenario was standard behavior:
$ ifconfig xl0
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:10:5a:a9:ed:be
media: Ethernet 100baseTX full-duplex
status: active
inet6 fe80::210:5aff:fea9:edbe%xl0 prefixlen 64 scopeid 0x1
inet 192.168.25.20 netmask 0xffffff00 broadcast 192.168.25.255
$ sudo ifconfig xl0 inet alias 192.168.25.49 \
netmask 255.255.255.255 broadcast 192.168.25.49
$ ifconfig xl0
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:10:5a:a9:ed:be
media: Ethernet 100baseTX full-duplex
status: active
inet6 fe80::210:5aff:fea9:edbe%xl0 prefixlen 64 scopeid 0x1
inet 192.168.25.20 netmask 0xffffff00 broadcast 192.168.25.255
inet 192.168.25.49 netmask 0xffffffff broadcast 192.168.25.49
$ sudo ifconfig xl0 inet -alias 192.168.25.49 \
netmask 255.255.255.255 broadcast 192.168.25.49
$ ifconfig xl0
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:10:5a:a9:ed:be
media: Ethernet 100baseTX full-duplex
status: active
inet6 fe80::210:5aff:fea9:edbe%xl0 prefixlen 64 scopeid 0x1
inet 192.168.25.20 netmask 0xffffffff broadcast 192.168.25.49
As you can see from the above example, the computer would no longer be
able to communicate on the network. The fix is:
$ sudo ifconfig xl0 inet alias 192.168.25.20 \
netmask 255.255.255.0 broadcast 192.168.25.255
$ sudo route -n delete default
$ sudo route -n add default 192.168.25.1
Then, network connectivity is restored. Generally, I remove aliases
with just "ifconfig xl0 inet -alias 192.168.25.49", but I think it's
reasonable for an admin to try the example above.
So... is this expected behavior?
-ME
--
http://erdelynet.com/
Support OpenBSD! http://www.openbsd.org/orders.html
