sit tunnels limit?

[Rafal Maszkowski]

I have 24 IPv6-in-IPv4 tunnels set up. When I am trying to add another one I
see:
root w 6bone-gw:/usr/src,255# ip tun add repcio mode sit local 193.219.28.246 remote 157.158.1.102
root w 6bone-gw:/usr/src,0# ip link set repcio up
ioctl: No such device

I tried to change HASH_SIZE in net/ipv6/sit.c but it didn't help.

The kernel I'm using is a slightly modified 2.2.5-15 from RedHat 6.0
(2.2.7[-ac1] stop after uncompressing).

R.