[LARTC] Logging dropped out-of-sequence packets on a load balanced router

[derek]

Hi,

I am trying to get information on out-of-sequence packets being dropped 
on my load balanced multilink router.

Can anyone give me any information on how best to log/track such packets?

The router is based on Leaf Bering uClib 2.4 (kernel 2.4.26)

The load balancing is being done using teql over a number of gre 
tunnels, each on a separate ethernet  ADSL to a central box where the 
gre tunnels terminate and the packet stream hits the Internet.

If one of the ADSL channels suffers from high latency then it seems that 
packets get dropped - I assume due to excessive packets being out of  
sequence on the remote end.

The effect is particulary noticeable if  one ADSL channel has a higher 
round trip latency than the others, or under heavy load if one channel 
has a lower speed.

Best regards,
Derek