Making FORWARD_IPV4=YES permanent / DHCP multiple routers

Tim Alberts talberts at
Tue Feb 12 18:27:17 UTC 2008


I'd like to configure my system to forward ip, to act as a gateway for 
my network.  I've always used a script during startup to do this:

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o ${UPLINK} -j SNAT --to ${IP_NAT}

This works fine, however I want this permanent so I don't have to run 
the script on startup.  I have the firewall setup with SNAT fine, but 
when I write the file /etc/sysconfig/network with the line 
'FORWARD_IPV4=YES' it still doesn't enable the ip forwarding after boot?

cat /proc/sys/net/ipv4/ip_forward

So how do I do this?

In DHCP, you can specify multiple DNS servers:

option domain-name-servers,,;

can you also do this with routers?

option routers;

so that if one is down, the network PC's can fail over to another?

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