[c-nsp] Packet Loss when sourced from VLAN but not switch

[Rodney Dunn]

Put a sniffer on the wire and figure out who is dropping it.

When you source it from a different IP address there is a chance
your return path takes a different direction so you need to chase
that down too.

On Thu, Oct 19, 2006 at 09:41:03AM -0400, Christian Koch wrote:
> Hi all,
> 
> 
> Having an issue maybe someone can shed some light on.
> 
> When I ping from the switch, 300bytes+ to Specificed IP I receive no
> packet loss
> 
> edge5-gw2#ping
> Protocol [ip]: 
> Target IP address: 213.52.216.4
> Repeat count [5]: 100
> Datagram size [100]: 300
> Timeout in seconds [2]: 
> Extended commands [n]: 
> Sweep range of sizes [n]: 
> Type escape sequence to abort.
> Sending 100, 300-byte ICMP Echos to 213.52.216.4, timeout is 2 seconds:
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> Success rate is 100 percent (100/100), round-trip min/avg/max = 1/5/120
> ms
> 
> When I ping from the switch sourcing the vlan, I receive packet loss
> 
> edge5-gw2#ping                  
> Protocol [ip]:                    
> Target IP address: 212.71.229.25         
> Repeat count [5]: 500
> Datagram size [100]: 500
> Timeout in seconds [2]: 
> Extended commands [n]: y
> Source address or interface: vlan318               
> Type of service [0]: 
> Set DF bit in IP header? [no]: 
> Validate reply data? [no]: 
> Data pattern [0xABCD]: 
> Loose, Strict, Record, Timestamp, Verbose[none]: 
> Sweep range of sizes [n]: 
> Type escape sequence to abort.
> Sending 500, 500-byte ICMP Echos to 212.71.229.25, timeout is 2 seconds:
> Packet sent with a source address of 213.52.216.6 
> .!!!!!!!!!!!!!.!.!!!!!!!!!!!!!!!!!!!!!!!.!!.!!!!.!!!!.!!!!!!!!!!!!.!.!
> !!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!.!!!!
> !!!!!!!!!.!!.!!!!!!!!!!.!!!!.!.!!!!..!!!!!!!!!!!!!!!!..!.!!!.!!!!!!!!!
> !!!!.!!!!!.!!!!!!.!!!.!!!!!!!!!.!.!!.!!!!!!!!!!!!!!!!!!.!.!.!!.!.!!!!!
> !.!!!.!!!!!!!!.!!..!!!!!!!!!!!.!!!!.!!!..!.!!!!!!!!!!!!!!.!!!.!!.!!!!!
> !!!!!!!!!!!!.!!!!!!!!!.!!!.!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!
> !!!.!!!!!!!!!!!!!!!!!!.!.!!.!!!...!!!.!!!.!!.!!!.!!!!!!!!.!!!!!!!!!!.!
> !!!!!!!!!!
> Success rate is 87 percent (435/500), round-trip min/avg/max = 1/5/700
> ms
> edge5-gw2.LHR3#
> 
> 
> Anyone have any ideas or insight on what and why this may be happening?
> 
> Thanks
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