Re: GNS ICMP drops to real switches

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 - 15:33:17 ART