ROUTE target and kernel 2.6.19

[ArcosCom Linux User]

Hi, I'm using:
   iptables 1.3.5 (FC5 distro with ROUTE target enabled)
   kernel 2.6.19
   pom-ng 20061129

My box is a dual xeon machine (SMP kernel).

I'm using 2 uplinks to connect my network to internet and its working
fine, but some disconnection isues using messenger (amsn, gaim, m$msn,
msn-messenger, etc...) needs I route all -p tcp --dport msnp over one
uplink.

To solve this problem, I want to try -j ROUTE target, to route all msnp
traffic only for one uplink (I don't know if this will solve the problem,
but I want to try). For this purpose, I wrote:

iptables -t mangle -A PREROUTING -p tcp --dport msnp -j ROUTE --gw
<uplink> --continue

The error is:
iptables: Unknown error 4294967295

In dmesg:
ipt_ROUTE: targinfosize 0 != 40

Any help about this?

Thanks