load balancing nat

[Subhro]

Hello folks,

I have a strange problem on hand. I have got two internal LANs and one
ISP link. I am trying to share the link between the two internal LANs
and do a load balancing between the two. The rules I am using are:

nat on $ext_if from { $int1_if:network, $int2_if:network } to any ->
$ext_if round-robin

where $int1_if, $int2_if are two internal interfaces and $ext_if is
the external interface.

However my observation is systems using $int_2 as gateway loose
connectivity randomly. Also the TTL values for the pings to the
gateway change to 150 from 64 as soon as the system looses
connectivity.

The systems in the LAN are all windows xp boxes.

Could anyone please tell me where I am going wrong?

Thanks and Best Regards
Subhro

-- 
Subhro Kar
Security Engineer
iViZ Techno Solutions Pvt. Ltd.
Dhanshree Bldg, 1st Floor
Plot XI-16, Sector V
Salt Lake City
700091
India