Re: GNS ICMP drops to real switches

Hi maarten,

I think this could be the GNS3 emulator issue only.

I have faced similar issues many times.with GNS3.....e.g packet drops ,
learning arp but not able to ping,,,multicasting dsn't work properly,,,,
OSPF & eigrp flaps even with 0% CPU utilization ..,etc...

regards,
Shekhar

On Wed, Aug 15, 2012 at 5:09 PM, Stephen Lynch <slynch_at_absnt.com> wrote:

> 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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> > >> ___________
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> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > > --
> > > Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
> >
> >
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> >
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Received on Wed Aug 15 2012 - 17:14:03 ART