Re: GNS ICMP drops to real switches

Agreed, all should work fine, if we understand the limitations.
NTP needs precise timing, which you loose when virtualizing things.
Mcast needs multicasting at the cable, which you have not when you build
point to point udp circuits. And so on.

On the other hand, seeing it on wireshark does not imply it makes the
cable. Pcap might get some weird error when trying to impose the packet
and simply drop it. That's why I was trying to pin point where that was
happening.

Those 1000 pings, are at what frequency ? I.e., one second between each
or back to back ? Just make a simple one virtual router to one real end
system to see # of packets sent / received...

-Carlos

Maarten Vervoorn @ 15/08/2012 10:18 -0300 dixit:
> 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 <mailto: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 <mailto: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
> <mailto: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
> <http://www.ccie.net/>
> >>
> >>
> ______________________________**______________________________**
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> >>
> >>
> >>
> >>
> >>
> >>
> >>
> > --
> > Carlos G Mendioroz <tron_at_huapi.ba.ar
> <mailto:tron_at_huapi.ba.ar>> LW7 EQI Argentina
>
>
> 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