Re: weird problem with ping (I know, shame on me)

Jersey,
Look into your routing table for that destination.
If the routing table follows the same path as the traceroute from the 6509 then you will know that the routing of that hop is fine.

My guess is that you may have some PBR defined on your network...

Look for route-maps that would select your source traffic and send it a different way then the information in the routing table....

Also the target host? Does it use a different default GW then the router send the packet on the last hop?

Any default routes used on the path?

You must draw out the network with the routing hop by hop to be able to find the issue... Both ways... From the source to the destination and the reverse...

This is not something that anyone can answer easily on a forum...

/Carl

On 2011-02-08, at 10:32, Jersey Guy <guy.jersey_at_gmail.com> wrote:

> Hi Larry,
> I can ping successfully from the 6509 using the source IP of the vlan on
> which the user sits. From the user's PC, cannnot ping the same address! If I
> do a trace from the pc, it does after 8 hops. I don't know what the 8th hop
> is, as I'm not able to telnet to it (connection refused). When I get into
> the 7th hop and do a trace for the destination IP, the route points to a
> different machine than the 8th hop in the traceroute. That is weird.
>
> On Fri, Feb 4, 2011 at 6:27 AM, Larry H <larryh12203_at_gmail.com> wrote:
>
>> Have you tried to ping from the 6509 using the source ip of one of the user
>> vlan's? What is the result? What about a trace from the pc? Where does it
>> die?
>>
>> Thanks
>> Larry Hadrava
>> CCIE #12203
>>
>> Sent from my iPad
>>
>> On Feb 3, 2011, at 6:16 PM, Jersey Guy <guy.jersey_at_gmail.com> wrote:
>>
>>> From the user's machine I can ping plenty of other IPs including the
>> default
>>> gateway and other IPs many hops away.
>>>
>>> On Thu, Feb 3, 2011 at 6:07 PM, Raghav Bhargava
>>> <raghavbhargava12_at_gmail.com>wrote:
>>>
>>>> Did u check the user machine..whether there is a host firewall blocking
>>>> icmp on his machine..
>>>>
>>>> -Raghav
>>>>
>>>> On Thu, Feb 3, 2011 at 2:35 PM, Jersey Guy <guy.jersey_at_gmail.com>
>> wrote:
>>>>
>>>>> Folks,
>>>>> I have a 6509 switch with a few user vlans. From the switch I can ping
>> a
>>>>> certain IP address that sits multiple hops away. From user workstations
>>>>> that
>>>>> have this switch as their default gateway, I can't ping the same IP
>>>>> address.
>>>>> I've checked the usual stuff - subnet mask, being able to ping the
>> default
>>>>> gateway, being able to ping other IPs, rebooting the darn PC....no
>> change.
>>>>> For clarification, when on the switch, I run extended ping with the
>> user's
>>>>> vlan as the source address. It works fine. Just can't ping from the
>> user's
>>>>> machine! Any pointers/ideas please?!
>>>>>
>>>>> TIA
>>>>>
>>>>>
>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>
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>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Warm Regards
>>>> Raghav
>>>
>>>
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>
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Received on Tue Feb 08 2011 - 11:12:31 ART