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 Post subject: Re: GNS3 0.8.2 BETA2 released
PostPosted: Sat Mar 17, 2012 1:47 am 
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Joined: Sun Jul 24, 2011 8:42 am
Posts: 5
Am I the only one experiencing constant packet loss (5-10% per host) for no reason since GNS3 was bumped to 8.x? I've run a few searches on the forum with no related hits coming up. I'm not talking about a complex network either, this occurs on a single ethernet link between a pair of hosts.

I'm using a 7200 IOS version 12.4T/15.xM and have tried this on a number of Windows boxes (XP and 7), with different hardware, including a VMware guest, with the same results. Uninstalling 8.x and replacing it with 7.4 fixes the problem.

Any suggestions?




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 Post subject: Re: GNS3 0.8.2 BETA2 released
PostPosted: Sat Mar 17, 2012 1:58 am 
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Joined: Sat Oct 11, 2008 1:41 pm
Posts: 2668
Location: Canada
This is very weird. I think you are the first to report this kind of prob.

You can try to use Dynamips 0.2.8-RC2 (http://www.gns3.net/dynamips/ to download) in GNS3 0.8.2. Also have you tried other IOS platform?

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 Post subject: Re: GNS3 0.8.2 BETA2 released
PostPosted: Sun Mar 18, 2012 3:17 am 
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Joined: Sun Jul 24, 2011 8:42 am
Posts: 5
I gave 0.2.8-RC2 a go and can verify that the problem still presents.

When you asked about other platforms, I didn't have any old images lying around but I started to wonder about the interface type. So I tried both 0.2.8-RC2 and 0.2.8-RC3 with 8.x, 7200 12.4(24)T7 and Ethernet, Fast Ethernet and Gigabit interfaces.

I normally use Fast or Gig (the config needs less changing around when I drop it onto production), so I tried these first and as expected, both of these interfaces showed drops in 8.x (both RC2 and RC3 community)

What wasn't expected was that Ethernet interfaces were clean for >1000 pings. So I guess I have a workaround in the interim :-)

R1 connected to R2 with one of each interface:

Code:
en
conf t
int eth1/0
no shut
ip add 10.1.1.2 255.255.255.252
int fa2/0
no shut
ip add 10.1.2.2 255.255.255.252
int gig3/0
no shut
ip add 10.1.3.2 255.255.255.252
end

R2#ping 10.1.1.1 repeat 100

Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 99 percent (99/100), round-trip min/avg/max = 72/93/364 ms
R2#ping 10.1.2.1 repeat 100

Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 10.1.2.1, timeout is 2 seconds:
.!!!.!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!
!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!
Success rate is 95 percent (95/100), round-trip min/avg/max = 56/87/128 ms
R2#ping 10.1.3.1 repeat 100

Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 10.1.3.1, timeout is 2 seconds:
.!!!.!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!
!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 95 percent (95/100), round-trip min/avg/max = 40/85/124 ms


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 Post subject: Re: GNS3 0.8.2 BETA2 released
PostPosted: Mon Mar 19, 2012 6:27 am 
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Joined: Tue Mar 08, 2011 2:25 pm
Posts: 101
Testing with the 0.8.2 (just released) and an older release makes a difference?
It is indeed very strange, UDP tunnels connect each peer directly to the other, these are your virtual links.

Very wild guess: bad performance in Dynamips (idlepc/max or something else) makes UDP packets queue within the running IOS system. They fill up the queue before they are delivered by the kernel and next arriving packet are dropped.
One could try to mitigate this by checking idlemax/idlepc settings and maybe find a way to tune the IOS to make the queue bigger if it's possible (that's beyond my knowledge but it would'nt be surprising that such a feature exists).


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 Post subject: Re: GNS3 0.8.2 BETA2 released
PostPosted: Mon Mar 19, 2012 7:31 am 
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Joined: Sat Feb 12, 2011 9:16 am
Posts: 87
malbert wrote:
Am I the only one experiencing constant packet loss (5-10% per host) for no reason since GNS3 was bumped to 8.x? I've run a few searches on the forum with no related hits coming up. I'm not talking about a complex network either, this occurs on a single ethernet link between a pair of hosts.

I'm using a 7200 IOS version 12.4T/15.xM and have tried this on a number of Windows boxes (XP and 7), with different hardware, including a VMware guest, with the same results. Uninstalling 8.x and replacing it with 7.4 fixes the problem.

Any suggestions?
have you tried with your firewall off? (VM and host)

_________________
Live Raizo / Live Linux to simulate networks and performing system administration experiments.
* Last Release : v5.14.09.02p
[ http://sourceforge.net/projects/live-raizo ]


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 Post subject: Re: GNS3 0.8.2 BETA2 released
PostPosted: Thu Mar 22, 2012 6:26 am 
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Joined: Sun Jul 24, 2011 8:42 am
Posts: 5
benjamin wrote:
Very wild guess: bad performance in Dynamips (idlepc/max or something else) makes UDP packets queue within the running IOS system...

The same Dynamips version was tested across both 7.4 and 8.X with the results only presenting in 8.X. There is a way to increase queue-limit on the hardware, logical interface, and any QoS classes, but the queues are already far larger than the ping count required to present drops.

Raizo62 wrote:
have you tried with your firewall off? (VM and host)

No, I imagine a firewall fault would cause all or nothing. Windows has granted the Dynamips executable a firewall exemption, and the firewall settings are consistent across 7.4 and 8.x


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 Post subject: Re: GNS3 0.8.2 BETA2 released
PostPosted: Fri Jul 19, 2013 5:14 pm 
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Joined: Fri Jul 19, 2013 5:04 pm
Posts: 1
Hi Malbert,

Nice post, what a coincidence I'm building a CME 7 with a 7200 router and the IOS 12.4(24)T had the same problem as you. I'm using the latest all-in-one GNS3 package. Neithet Gigabit nor Fastethernet seemed to work fine all those had packet loss so it was frustrating trying to copy tar files for phones from my TFTP on the laptop, the problem was timeouts and I relized I had packets loss, unexpected it happens on the same machine, I have a link to one of my Local Area Networks on my laptop.
Anyway found your post and your workaround works fine !
Using a Ethernet/full duplex ping rate is perfect and with no loss
Thanks a lot




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