Hi,

This usually happens when a router has 2 routes to the
same destination net but one of the next-hops doesn't
have a route back to the source. 

Whats your routing table look like, how about the
destination routers routing table? 

Is the IP address space on your LAN side public space
your ISP provided? How about the interface connecting
to them? Also, try pinging with extended commands
using your LAN IP as a source and see if that is
error-free. If it is, then the destination router has
a route back to that IP subnet fine.

Do a debug ip packet, might want to point it to an
access-list so it doesn't show you everything. eg:
debug ip pack 101. 

If the debugs show everything going out the same
interface then it's probably the other end. 

HTH, Erick

--- Hamid Ali Asgari  wrote:
> Hi group,
> 
> I have a router which is the main gateway of my
> network. All the
> hosts on my network can successfully ping everywhere
> on the internet,
> but the ROUTER itself has always a success rate at
> 50%. Bellow is the
> ping result:
> 
> Router#ping       
> Protocol [ip]: 
> Target IP address: 193.0.0.193
> Repeat count [5]: 10
> Datagram size [100]: 
> Timeout in seconds [2]: 
> Extended commands [n]: 
> Sweep range of sizes [n]: 
> Type escape sequence to abort.
> Sending 10, 100-byte ICMP Echos to 193.0.0.193,
> timeout is 2 seconds:
> !.!.!.!.!.
> Success rate is 50 percent (5/10), round-trip
> min/avg/max =
> 
> Same time my computer which is exactly behind the
> router can ping
> 193.0.0.193 without any errors.
> 
> 
> No routing protocol is running on the router and
> it's using simple
> static routes and all of its interfaces have VALID
> IP addresses.
> 
> Any idea what the problem is ???
> 
> Thanks in advance,


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