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 Post subject: Physical link only via cloud to router not virtual switch
PostPosted: Sun Mar 04, 2012 1:59 am 
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Joined: Sun Mar 04, 2012 1:30 am
Posts: 3
Hi

Running 0.8.2-Beta2.

I'm experiencing a similar problem to http://forum.gns3.net/posting.php?mode=reply&f=14&t=4433&sid=75a0a656a5a241e536317d45c66121a8

If I connect a cloud (bound to my NIC) and link to a router, everything works fine.

If I create a virtual switch between my router and cloud then I get intermittent pings. Some pings will time out, some will reply.

I have had the same intermittent ping when I connect a loopback to a virtual switch. Also I have tried connecting a Linksys wireless NIC to a virtual switch and get the same issues.

However, if I connect direct to the virtual router from cloud wireless or cloud loopback or cloud Realtek NIC it works OK.

Running Windows 7 64bit. Realtek PCIe GBE RTL8167.

I couldn't even get any traffic through until I found the fixes from various threads about disabling:

IPv4 Checksum Offload (disabled)
Large Send Offload (disabled)
TCP Checksum Offload (disabled)
UDP Checksum Offload (disabled)

As Wireshark was showing incorrect checksums.

Show mac on the switch displays the correct MAC for router and NIC. Also arp table on router shows correct MAC for NIC.

Wireshark capturing on real NIC of PC shows ICMP echo then eventually a reply.

Any ideas?




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 Post subject: Re: Physical link only via cloud to router not virtual switc
PostPosted: Mon Mar 05, 2012 4:52 pm 
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Joined: Sun Mar 04, 2012 1:30 am
Posts: 3
OK I have done some troubleshooting.

What I have found is if I go to Local Area Connection Properties of my NIC and untick COMODO Internet Security Firewall Driver. Disable the NIC and then re-enable it. Start GNS3. It works connecting cloud to switch and switch to router.

I cant find anything on Google about Comodo Firewall having compatibility issues with GNS3, Dynamips or WinPcap.

Its strange that it works using a cloud connection direct to router but not direct to switch.

I need to keep my firewall running. I have tried allowing all on the firewall but to no avail. This is the REAL world connection for my virtual routers so I need to use this NIC.


Any suggestions?


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 Post subject: Re: Physical link only via cloud to router not virtual switc
PostPosted: Mon Mar 05, 2012 5:19 pm 
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Joined: Sun Mar 04, 2012 1:30 am
Posts: 3
OK another update.

Created a loopback adapter in Windows (no IP address - IP assigned via DHCP). Bridged this with my LAN adapter. The bridged connection STILL has Comodo driver enabled. BUT it now works!!

... 1 way.

I can ping from PC to virtual router but not the other way round.

So it seems that doesn't work either.

My only option seems to be to disabled the Comodo driver on the NIC.

Any other ideas?




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