Re: GNS ICMP drops to real switches

Stephen,

Thanks for your help. I solved it finaly. You were right it was somewhere
in GNS. It was due to sparse memory support was enabled. I disabeled that
option allready in GNS but it still remains active in the configuration
file. After removing that option the drops disapeared.

Kind regards,

Maarten Vervoorn

2012/8/15 Stephen Lynch <slynch_at_absnt.com>

> Hmm not quite sure...wish I could help more.
>
> -SL
>
> On Aug 15, 2012, at 9:33 AM, Maarten Vervoorn <mr.vervoorn_at_gmail.com>
> wrote:
>
>
> Stephen,
>
> Thanks for your replies.I have not tried to swap nic because there is only
> one 4 port NIC. I can try to change to an other port on the same NIC. I use
> a breakout switch so one NIC is connected to a breakout swithc which uses
> QinQ with a VLAN for each ethernet connection. I set the MTU on my adapter
> to 9000 bytes.
>
> Regards,
>
> Maarten
>
>
> 2012/8/15 Stephen Lynch <slynch_at_absnt.com>
>
>> You try swapping out the NICs? Are you using USB to Ethernet adapters or
>> a breakout switch? I actually set my adapters to accept Jumbo Frames and
>> that solved a lot of issues for me (1500 > 2000 bytes).
>>
>> On Wed, Aug 15, 2012 at 9:26 AM, Maarten Vervoorn <mr.vervoorn_at_gmail.com>wrote:
>>
>>> 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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>>>>>>
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> > --
>>>>>> > Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>>>>>
>>>>>>
>>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>>
>>>>>>
>>>>>> _______________________________________________________________________
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Received on Wed Aug 15 2012 - 15:58:53 ART