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 Post subject: TTL expired in transit
PostPosted: Sun Jan 05, 2014 3:02 pm 
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Joined: Sun Jun 02, 2013 9:20 am
Posts: 7
Hello everyone,

Few days ago I cleaned up my computer and also upgraded GNS3 to the latest version. But that seems to have screwed up my lab.

I get this error "TTL expired in transit", each time I try to ping any GNS3 device from my local computer. I tried everything possible, but it just doesn't work.

Here's the topology:

Image
(Image URL: http://picpaste.com/topology-3hYXJAp1.jpg)

fa0/0 on R1 has the IP 172.16.1.1/24. I have only one loopback adapter on my Windows 7 machine and it has the IP 172.16.1.2/24.

Here's my windows routing table:

Image
(Image URL: http://picpaste.com/routing-TUnF4IjE.jpg)

Sure there's a routing loop that is causing the problem as can be seen from the tracert:

Image
(Image URL: http://picpaste.com/tracert-nS29Bwdp.jpg)

I tried everything possible, removed default routes, added new routes etc. but can't figure out.

Any help on this?

Thanks in advance.




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 Post subject: Re: TTL expired in transit
PostPosted: Sun Jan 05, 2014 6:42 pm 
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Joined: Thu Jul 26, 2012 11:19 pm
Posts: 143
Location: U.K.
Can you post your topology.net? - paste the output of show run from the GNS3 console.

_________________
GNS3 0.8.4 running on Windows 8.1
GNS3 0.8.4 running on CentOS 6.5


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 Post subject: Re: TTL expired in transit
PostPosted: Mon Jan 06, 2014 5:59 pm 
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Joined: Sun Jun 02, 2013 9:20 am
Posts: 7
nickbeee wrote:
Can you post your topology.net? - paste the output of show run from the GNS3 console.


Hey "nickbeee", thank you very much for the reply. However I found out what the cause of the issue is and also that this issue has been reported on gns forums quite a few times previously but there seems to be no solution to it.

So I'm going to post it in a new topic.

Admin/Moderator - kindly close this thread.


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 Post subject: Re: TTL expired in transit
PostPosted: Mon Jan 06, 2014 10:25 pm 
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Joined: Thu Jul 26, 2012 11:19 pm
Posts: 143
Location: U.K.
It doesn't happen in every case which is why I asked to see a topolog.net file. Using GNS3 0.8.4 on Win 8.1 64 bit I can ping the router from the loopback through a switch. If I turn off Windows firewall (or add a rule for ICMP) I can ping the loopback from the router. It may be specific to a particular version of Windows OR Dynamips OR antivirus software (which can load additional drivers into the Windows network interface).

Quote:
Few days ago I cleaned up my computer and also upgraded GNS3 to the latest version. But that seems to have screwed up my lab.


So could you ping before you upgraded GNS3? IF so what GNS3 version did you have previously? Which version of Windows? Which version of WinPcap? Which antivirus software?

Here's my topology.net for this
Code:
autostart = False
version = 0.8.4
[127.0.0.1:7200]
    workingdir = working
    udp = 10001
    [[7200]]
        image = D:\GNS3-Common\Images\c7200-advipservicesk9_li-mz.124-15.T14.image
        idlepc = 0x60701b54
        sparsemem = True
    [[ETHSW SW1]]
        1 = access 1 R1 f0/0
        2 = access 1 nio_gen_eth:\device\npf_{afb07db4-ee8c-459c-873a-7006ad7e6bf7}
        x = -185.5
        y = -96.0
        z = 1.0
    [[ROUTER R1]]
        console = 2102
        aux = 2502
        cnfg = configs\R1.cfg
        slot0 = C7200-IO-2FE
        f0/0 = SW1 1
        slot1 = PA-A1
        x = -378.0
        y = -104.0
        z = 1.0
[GNS3-DATA]
    configs = configs
    workdir = working
    [[Cloud C1]]
        symbol = Host
        x = 25.5
        y = -99.5
        z = 1.0
        connections = SW1:2:nio_gen_eth:\device\npf_{afb07db4-ee8c-459c-873a-7006ad7e6bf7}



_________________
GNS3 0.8.4 running on Windows 8.1
GNS3 0.8.4 running on CentOS 6.5


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