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Ping problem to Gigabit cards 77xx with large buffer size (-l option)

 

Ping problem to Gigabit cards 77xx with large buffer size (-l option)

Hello,

I just have discovered that all my HP DL380 Gigabit Nics (7781/7782) on DL380G3 and G4 don't answer to a ping test with larger packet size (> 25000) than default (32) ...

Using the following command ping x.x.x.x -l 50000, I always get a request timed out message

No special parameter has been used when configuring these cards. Last drivers have been applied

Windows 2003 server SP1
Network Utility 8.20.0.16
Driver 8.48.0.0

On the same network, HP 100TX Nics (3163 per exampe) on DL380G2 respond well to this kind of ping with packet as bigger as 50000...

Does anybody know why this happens? Is it normal?

Thanks in advance for help

Philippe
1 REPLY
Bill Ruys
Occasional Advisor

Re: Ping problem to Gigabit cards 77xx with large buffer size (-l option)

It could be that the Gigabit NICs are attempting to reply using "Jumbo Frames". Your switches may be having trouble due to their inherent MTU size.

Check and see if Jumbo Frames are enabled on the NICs. Try disabling them and then try pinging again.