Tim Alberts wrote:
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}
For ip forwarding, edit /etc/sysctl.conf and make sure you have a line that says net.ipv4.ip_forward = 1
For iptables, if you already have a working iptables config, just run: service iptables save This will create an /etc/sysconfig/iptables for you. Then make sure that the system loads up these rules on boot with: chkconfig iptables on
Re: your dhcp question below...you can do what you list (the man page [man dhcp-options] and RFC2132 say they should be listed in order of preference) but the question really is, "What will the DHCP client do with multiple IPs in this option?" because I could see this behavior being inconsistent.
-Shawn
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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