Re: GNS ICMP drops to real switches

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
>> >>
>> >>
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>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> > --
>> > Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>
>>
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Received on Wed Aug 15 2012 - 15:18:55 ART