Destination suddenly not reachable

[lkytmr]

I have been running mediawiki on an ubuntu machine for six months on IP 172.26.3.223.

The wiki stopped responding one day in the middle of a wiki page edit and I found that I could no longer ping 172.26.3.223 from Windows. I found that if I set the machine’s IP to 172.26.3.224, it works. Any other IP except for .223 works.

My interface file and output from ifconfig are included below.

I have three IP addresses on this one machine,

1.) one assigned from DHCP (usually 172.26.3.137),
2.) one static IP 172.26.3.223 (this is the one that stopped working)
3.) one static IP 172.26.3.225 (this one still works)

My window’s machines

1.) Cannot ping 172.26.3.137 (Destination host unreachable.)
2.) Cannot ping 172.26.3.223 (Destination host unreachable.)
3.) Can ping 172.26.3.225

My ubuntu-mediawiki machine

1.) Can ping all three of its own IP addresses
2.) Can ping external IP addresses

Thanks for any help you can offer
Tom

Here is my interfaces file:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp

auto eth0:1
iface eth0:1 inet static
address 172.26.3.225
netmask 255.255.0.0
gateway 172.26.0.1

auto eth0:2
iface eth0:2 inet static
address 172.26.3.223
netmask 255.255.0.0


Here is the output of ifconfig
Last login: Mon Feb 14 09:33:05 2011 from 172.26.3.119
tmr@csc-wiki:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:e0:4c:87:b5:fc
inet addr:172.26.3.137 Bcast:172.26.255.255 Mask:255.255.0.0
inet6 addr: fe80::2e0:4cff:fe87:b5fc/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:179 errors:0 dropped:0 overruns:0 frame:0
TX packets:186 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:18092 (18.0 KB) TX bytes:24571 (24.5 KB)
Interrupt:22 Base address:0xe800

eth0:1 Link encap:Ethernet HWaddr 00:e0:4c:87:b5:fc
inet addr:172.26.3.225 Bcast:172.26.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:22 Base address:0xe800

eth0:2 Link encap:Ethernet HWaddr 00:e0:4c:87:b5:fc
inet addr:172.26.3.223 Bcast:172.26.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:22 Base address:0xe800

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:16436 Metric:1
RX packets:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1248 (1.2 KB) TX bytes:1248 (1.2 KB)

[Iowan]

Probably won't shed any new light, but...
What's in your routing table (route -n)?

[lkytmr]

As it turns out, our IT guy shut my wiki down. I'm not sure how you go about turning an IP address off but I'm assuming the gateway has a table that you can blacklist ip addresses with.

Its really irritating because he turned it off and never said a word. Cost me a days worth of work.

He's a control freak.