Re: GNS ICMP drops to real switches

What kind of pings give you drops ? (I.e. size, frequency)
Is this repeatable ?

May be you are getting a collision where it is not expected?
Your host link is @100Mbps ? @ Giga ?

Is your host link dedicated to just this virtual trunk ? Can you check
tx (virtual) count vs real rx and vice versa ?

Just some thougths...
-Carlos

Maarten Vervoorn @ 15/08/2012 04:34 -0300 dixit:
> Dear all,
>
> Can anyone help me with this ICMP drop issue?
>
> I have created a CCIE R&S lab in GNS and used QinQ to connect the virtual
> router network to the real switches. All connectivity is working.
>
> When I ping form a virtual router to a physical switch I receive drops
> about 5 percent avarage.
>
> I installed GNS on a windows 2008 R2 64bit machine. 1 Xeon procesors with 4
> cores each and 6 Gbit of memory
> Idle PC is calculated and at 0% when the lab is booted
> The NIC is a HP-NC382i DP (Broadcom chipset)
> I use the HP configuration tooling to create serveral VLAN on the adapter.
> This VLAN is presented as a NIC in Windows which I use in GNS for a virtual
> router to real switch connection
>
> When I ping from the real switch to the virtual router I receive no drops
> When I ping from router to router (virtually connected) I receive no drops
> When I ping from router to router ( through the physical switch network) I
> receive the same drops.
> When I ping the cpu of the server and router is not increased.
>
> When I use wireshark to snif the traffic on the physical interface of the
> server I can see the ICMP request of the packet that times out. I do not
> receive that packet on the switch behind the port.
>
> When I look at the statistics of the NIC on the server I do not see any
> errors
> When I look at the statistics of the router interface I do not see any
> errors
> When I look at the statistics of the breakout switch port I do not see any
> errors
> When I look at the statistics of the real switch port I do not see any
> errors
>
> I updated the drivers to the latest version. which didn't have any result.
> I replaced the cable. Which also didn't have any results
>
> Any one have any experience with this same issue? Some setteing on the
> adapter maybe. I have tried to enable or disable serveral things like flow
> control but this doesn't seem to help
>
> Thanks in advance
>
> Regards,
>
> Maarten Vervoorn
>
>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net