Cannot ping own IP

My server can ping other file and application servers.  However, it cannot ping its own IP and router.  I have MPTS and TCP/IP v.3 running on OS/2 Warp Connect 3.0.
MokMokAsked:
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OttaConnect With a Mentor Commented:
Use 'ifconfig lo up'

(Note: 'lo' is the first letters of 'LOOPBACK', not "ten".)
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OttaCommented:
What's the output from the OS/2 command:

   netstat -r

???

Can other servers "ping" the router?
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MokMokAuthor Commented:
Adjusted points to 190
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MokMokAuthor Commented:
I tried 'ifconfig lo up', i executed it in the command line but i don't know what happened to my computer.  can you explain what 'ifconfig lo up' does?  thanks and regards.
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OttaCommented:
'IFCONFIG LO UP'.

I(nter)
F(ace)
CONFIG(uration) utility to set the TCP/IP
LO(opback) interface into the
UP (not "down") status,
to enable TCP/IP "clients" and "servers" to communicate "internally",
rather than communicating to a different host.

Check the output from 'netstat -r'
both "before" and "after" the command.
Post both results here.

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MokMokAuthor Commented:
Before netstat (cannot ping ip anymore)

default                  router                    netmask
172.0.0.1              189.5.16.93           0.0.0.0
189.5.16               172.0.0.1               255.255.255.255
189.5.16               189.5.16.83           255.255.255.0
189.5.16.83          189.5.16.93           255.255.255.0
189.5.16.93          189.5.16.93           255.255.255.255
189.61.10.226      189.5.16.93           255.255.255.255

After netstat the same data
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OttaCommented:
> 189.5.16.83
> 189.5.16.93
> 255.255.255.0

Are you sure about this line?
'83' versus '93' ???

> 172.0.0.1 189.5.16.93 0.0.0.0

Are you sure that it is '172' ?

After rebooting, try 'ifconfig lo'.
What is the output?
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MokMokAuthor Commented:
172 should be 127....

after rebooting the pc, it gives me...
default                  router                    netmask
default                  189.5.16.93           0.0.0.0
127.0.0.1              127.0.0.1               255.255.255.255
189.5.16               189.5.16.93           255.255.255.0
189.5.16               189.5.16.93           255.255.255.0
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OttaCommented:
What's the output from:

netstat -a   ...and... ifconfig lan0

???
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