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Old 07-08-2009, 10:37 AM   #1
zion_rulz
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Registered: May 2009
Location: India
Distribution: kubuntu-8.04.2
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Traceroute problem in LAN -- strange!!


Hi,

This is quite strange; I have 3 VLANs configured in my workplace

160.18.145.0
160.18.146.0
160.18.147.0

gateway - 160.18.145.1

Now, I have 2 systems running on suse 11.1
a)160.18.146.aaa
b)160.18.147.bbb

I am able to ping each other, but unable to traceroute. I don't have a gateway configured on either of these machines; not sure if that's the reason.

Any help will be appreciated.
Thanks in advance.
 
Old 07-08-2009, 01:59 PM   #2
gratuitous_arp
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Registered: Jul 2009
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Depending on the level of security in your environment, low TTL values may be blocked by access lists or iptables rules as traceroute is often used maliciously for network mapping. Even if you have authorization to check, it's probably not a good idea to post your company's ACLs and firewall rules here, so you could simply see if traceroute works when you use a higher TTL value by using:

traceroute -f 250 <IP>

Are you saying that your clients don't have routes to one another? If you're routing between multiple VLANs, you should have a VLAN interface or a router subinterface somewhere that acts as a default gateway for that VLAN/subnet. Otherwise you shouldn't be getting off-net unless there is something else going on in your network. Can you post the output of "ip route" and "ip addr show" from the two machines you're testing connectivity between?
 
Old 07-09-2009, 02:33 AM   #3
zion_rulz
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Smile

Thanks for responding. I had been able to fix the issue; I have stopped the firewall and it started working
 
  


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