[CentOS] Making FORWARD_IPV4=YES permanent / DHCP multiple routers
CM
cristim at mail.multinet.ro
Tue Feb 12 18:32:45 UTC 2008
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}
>
> 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?
>
Modify /etc/sysctl.conf :
# Controls IP packet forwarding
net.ipv4.ip_forward = 1
CM
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