Re: GNS ICMP drops to real switches

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 - 09:09:18 ART