Cisco 1721 First few pings Timeout?

[bartbauldry]

Hello,

I have a Cisco 1721 router. It’s in a basic setup with NATs the public IP addresses to the internal LAN. The basic configuration is working, but it seems that where ever I ping, the first three requests time out then it will start to receive replies, this isn’t down to the DNS resolving either, host names are resolved in a normal timely manner. This problem is also felt while web browsing and with most applications.

This seems an odd problem; I’ve tried searching the internet but seem to have found nothing

Does anyone know what would be causing this and/or how to resolve it?

Thanks

Bart

 

[burtsbees]

Which interface?

Burt

 

[bartbauldry]

Hi,

I have a WIC-1ENET as the connection to the internet, and a WIC-4ESW for the connection to the LAN.

The console throws this error:

"CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on Ethernet5 (not full duplex), with Router FastEthernet1 (full duplex)."

Would this have something to do with it?

Thanks

Bart

 

[Minue]

Hello
The "mismatch" could be the problem.Try hard coding the devices,use the command "duplex half".I guess you are pluging the 1721 into a non-cisco.Cisco devices don't like the auto-negotiating with foreign appliances.
If the above doesn't solve the problem,then it may be an "arp" issue.
Regards