Can't Ping

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# 1  
Can't Ping

I have an old MP-Ras Unix system. I have setup netowkring but am unable to ping any local network pcs or the default gateway. If i use the arp -a command I receive the correct mac address for all connected pcs but I cannot ping anything except the local address. Any help would be appreciative.

netstat -rn
Routing tables
Destination      Gateway                Flags    Refs      Use  Interface
default              UGS         0        0  en2              UH          2        8  lo0      UC          0        0  en2              UGHS        0        0  lo0      UCS         0        0  en2

arp -a
? ( at 0:18:1:fc:41:a2 (802.3) 
? ( at (incomplete) (802.3)
mcpserver ( at 0:11:85:7a:58:b9 (802.3)
? ( at (incomplete) (802.3)
? ( at (incomplete) (802.3)

Last edited by DukeNuke2; 11-01-2011 at 07:34 PM..
# 2  
It seems that there are some sort of firewalls in between your host and other hosts which discards ICMP packets .
# 3  
That was my thought but there is no firewall on the unix pc and all other pcs on the network can ping each other so I ruled out firewall on pcs and or router
# 4  
If this is not the case it might be that your TCP/IP ICMP stack settings discard ICMP packets.
Try to ping yourself from the host itself ( not the loop back address ) and from some other host and see what happens.
# 5  
I can ping myself from the host but I cannot ping myself from any other host.

---------- Post updated at 11:31 PM ---------- Previous update was at 11:24 AM ----------

When I telnet into my router and do an arp -a command the router shows my unix ip with incomplete. It is not able to resolve mac address which I believe is the reason why I can't ping any other pcs on my network. Any ideas
# 6  
it might be due to some bug in router software . You can clear the mac enrty from the router database and check if its getting updated correctly after that .
# 7  
Can you show me the out put of the commands below?

ifconfig -a

netstat -rnv
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