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 Post subject: GNS ping drops to real switches
PostPosted: Tue Aug 14, 2012 6:26 pm 
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Joined: Tue Aug 14, 2012 6:25 pm
Posts: 3
Dear all,

Can anyone help me with this ping 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 2 to 4 percent.

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)

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 ideas what this could be? 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




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 Post subject: Re: GNS ping drops to real switches
PostPosted: Sat Aug 18, 2012 3:47 am 
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Joined: Sat Oct 11, 2008 1:41 pm
Posts: 2668
Location: Canada
Hi,

Dynamips can have a few issues (drops) with some model of NICs on Windows. Can you do the test using Linux for instance? Just to confirm the problem.

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Jeremy, GNS3 Programmer & Benevolent Dictator for Life.


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 Post subject: Re: GNS ping drops to real switches
PostPosted: Sun Aug 26, 2012 9:23 pm 
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Joined: Sun Aug 26, 2012 9:16 pm
Posts: 2
I have same issue, are you use c7200 ios? do you use gigabit router interfaces to connect to the physical switches?

also I noticed when pinging from router to physical switch there are no drops, but pinging from physical switch, there is.


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 Post subject: Re: GNS ping drops to real switches
PostPosted: Mon Aug 27, 2012 7:02 am 
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Joined: Tue Aug 14, 2012 6:25 pm
Posts: 3
I have solved the issue.

It was due to sparse memory enable.

Kind regards,

Maarten Vervoorn


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 Post subject: Re: GNS ping drops to real switches
PostPosted: Mon Aug 27, 2012 12:20 pm 
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Joined: Sun Aug 26, 2012 9:16 pm
Posts: 2
Thank you verrrrrrrrrrrry much my friend, now it's working


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 Post subject: Re: GNS ping drops to real switches
PostPosted: Mon Aug 27, 2012 11:06 pm 
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Joined: Sat Oct 11, 2008 1:41 pm
Posts: 2668
Location: Canada
Hey thanks, I was far from thinking this is due to sparsemem feature ... strange but it is true that we recently spotted some issues with it for c1700 and c2600 platforms.



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