Very Computer

I can run the command (iptables -t nat -A POSTROUTING -o eth0 -s
192.168.50.0/255.255.255.240 -j MASQUERADE) manually, and the box will masq
properly.

I saved the ruleset with iptables-save > /etc/sysconfig/iptables.  The file
is written properly, and the iptables init script appears to be setting
everything up correctly.  Even after running the iptables startup script
after a reboot, running iptables-save returns the correct ruleset, but the
machine does not masquerade anything.  I have to run the command manually,
then it will masquerade everything from my internal network properly.

I've also noticed that iptables -L does not return any rule info on the
masquerade rule, regardless of whether or not I run the iptables init script
or the masquerade command manually.

Here's the output of iptables-save:
-----
# Generated by iptables-save v1.2.4 on Sat Dec 29 16:06:24 2001
*nat
:PREROUTING ACCEPT [53:10026]
:POSTROUTING ACCEPT [7:552]
:OUTPUT ACCEPT [7:552]
-A POSTROUTING -s 192.168.50.0/255.255.255.240 -o eth0 -j MASQUERADE
COMMIT
# Completed on Sat Dec 29 16:06:24 2001
# Generated by iptables-save v1.2.4 on Sat Dec 29 16:06:24 2001
*filter
:INPUT ACCEPT [834:54183]
:FORWARD ACCEPT [530:292786]
:OUTPUT ACCEPT [595:76685]
COMMIT
# Completed on Sat Dec 29 16:06:24 2001
-----

I have verified that ipchains is not running on the box (I've even removed
it).  I had this same problem when I ran RH 7.1 on the same machine.  I
completely reinstalled the OS on the machine (using 7.2), and I'm still
running into this problem.

Anyone have any ideas?

*nat
:PREROUTING ACCEPT [39986:2449590]
:POSTROUTING ACCEPT [410:71021]
:OUTPUT ACCEPT [35921:2247507]
-A POSTROUTING -o eth1 -j MASQUERADE
COMMIT
*filter
:INPUT ACCEPT [248896:179591216]
:FORWARD ACCEPT [182710:41251104]
:OUTPUT ACCEPT [553057:188899781]
-A FORWARD -s 192.168.10.0/255.255.255.0 -o eth1 -j ACCEPT
COMMIT

eth0 is an internal interface, eth1 is external.

iptables will list the masquerading rule if you do
iptables -t nat -nL

-S