[CentOS] Making FORWARD_IPV4=YES permanent / DHCP multiple routers
Tim Alberts
talberts at msiscales.comTue Feb 12 18:26:54 UTC 2008
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First, 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 0 So how do I do this? Second, In DHCP, you can specify multiple DNS servers: option domain-name-servers 10.0.0.1, 10.0.0.2, 10.0.0.3; can you also do this with routers? option routers 10.0.0.1 10.0.0.2; so that if one is down, the network PC's can fail over to another?
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