Re: GNS ICMP drops to real switches

I have did some more troubleshooting and it seems that when I send only
40byte icmp packets I will no drops. When I send ICMP packets of 41 bytes I
do receive drops

Regards,

Maarten

2012/8/15 Maarten Vervoorn <mr.vervoorn_at_gmail.com>

> Stephen,
>
> All protocols work fine. The packets are leaving the virtual network
> because I can see it in wireshark. This probably means something is wrong
> with the NIC. Could be hardware or some driver settings
>
> I also used GNS during my CCIE study everything works perfectly no ping
> drops there. I would not relate this issue to GNS or dynamibs but to some
> NIC settings. Currently I'm building a CCIE lab for some collegues who are
> also studying for the CCIE exam. I was wondering someone maybe had the same
> issue and was able to solve it.
>
> Kind regards,
>
> Maarten Vervoorn
>
> 2012/8/15 Stephen Lynch <slynch_at_absnt.com>
>
>> I know this is probably not something you want to hear, but I used GNS3
>> throughout my entire study process and somethings simply don't work.
>> Multicast and NTP are technologies that don't really play well with GNS3
>> and you may get varied results from lab to lab.
>>
>> Stephen Lynch
>> CCIE #36243
>>
>>
>>
>>
>> On Wed, Aug 15, 2012 at 9:06 AM, Maarten Vervoorn <mr.vervoorn_at_gmail.com
>> > wrote:
>>
>>> It is ping with any number from a 7200 router. If I send 1000 or 5000
>>> pings
>>> 5% is dropped. Size is 100bytes.
>>>
>>> Host link is 100Mbps. No error and collisions are in the statistics of
>>> the
>>> adapter, virtual router, breakout switch or physical switch.
>>> The physical host link is shared among 9 virtual routers with 12 ethernet
>>> connections over that. The NIC creates an adapter for each VLAN which is
>>> attached to one ethernet link of the virtual router and not shared with
>>> other connections. Behind the physcial port is a breakout switch which
>>> uses
>>> QinQ tunneling.
>>> I have also tested the configuration without QinQ and just attached one
>>> router to the breakout switch and have routed ports on both sites. So a
>>> direct L3 connection between physical and virtual and gave the same
>>> result.
>>> I can see the packet in Wireshark leaving the server. That is just before
>>> the data is actually set on the NIC. But I do not receive it on the
>>> switch
>>> behind it. So it seems on the transmit site of the NIC it gets dropped
>>>
>>> Kind regards,
>>>
>>> Maarten Vervoorn
>>>
>>>
>>>
>>>
>>>
>>> 2012/8/15 Carlos G Mendioroz <tron_at_huapi.ba.ar>
>>>
>>> > 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
>>> >>
>>> >>
>>> >> Blogs and organic groups at http://www.ccie.net
>>> >>
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>>>
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>>> >>
>>> >>
>>> >>
>>> >>
>>> >>
>>> >>
>>> >>
>>> > --
>>> > Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>>
>>>
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>>>
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Received on Wed Aug 15 2012 - 15:26:11 ART