[c-nsp] round-trip differences towards google

[Rens]

Hi all,

 

I'm having some difficulties understand some round-trip difference on the
same router just by changing the source interface:

 

Pings are done towards a resolved IP of www.google.be

 

ping 209.85.227.103 repeat 50

 

Type escape sequence to abort.

Sending 50, 100-byte ICMP Echos to 209.85.227.103, timeout is 2 seconds:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (50/50), round-trip min/avg/max = 8/9/12 ms

 

ping 209.85.227.103 repeat 50 source AT3/0.102

 

Type escape sequence to abort.

Sending 50, 100-byte ICMP Echos to 209.85.227.103, timeout is 2 seconds:

Packet sent with a source address of xxx

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (50/50), round-trip min/avg/max = 8/9/12 ms

 

ping 209.85.227.103 repeat 50 source AT3/0.134

 

Type escape sequence to abort.

Sending 50, 100-byte ICMP Echos to 209.85.227.103, timeout is 2 seconds:

Packet sent with a source address of xxx 

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (50/50), round-trip min/avg/max = 80/83/88 ms

 

ping 209.85.227.103 repeat 50 source lo0 

 

Type escape sequence to abort.

Sending 50, 100-byte ICMP Echos to 209.85.227.103, timeout is 2 seconds:

Packet sent with a source address of xxx 

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (50/50), round-trip min/avg/max = 80/83/88 ms

 

Is this google magic depending on my source IP address?

 

Regards,

 

Rens