Re: GNS ICMP drops to real switches

Sweet, glad you were able to resolve your issue. You should report the bug
to the GNS3 developmental team.

http://forum.gns3.net/developement-f14.html?sid=203b1fb0bb46939604ec52b5f95dfcb5

- SL

On Wed, Aug 15, 2012 at 9:58 AM, Maarten Vervoorn <mr.vervoorn_at_gmail.com>wrote:

> 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
>>>>>>> >>
>>>>>>> >> ______________________________**______________________________**
>>>>>>>
>>>>>>> >> ___________
>>>>>>> >> Subscription information may be found at:
>>>>>>> >> http://www.groupstudy.com/**list/CCIELab.html<
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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 - 10:00:30 ART