LinuxにおけるSNAT、DNATの設定方法について確認したのでメモ。 前提としては、NAT用ルータとしてではなくパケット送信する端末としての設定である。 よく使うことが想定されるのは[1-1]及び[2-1]である。 環境 [
I did some tests with iptables NETMAP but I can't manage to make it work because I don't find a way to modify source+destination after routing decision. I prefer to avoid the new --client-nat OpenVPN's feature. Maybe I have to force routing with ip route? Or to loop twice into the network stack with veth? Note : I don't want to use masquerade. I'll need something like: ip6tables -t nat -A POSTROUTING -o eth0 -s fc00::/64 -j NETMAP --to 2006::/64 to nat the addresses to global addresses (and with proper dnat rules) But I can not find anything like that in nftables 2019-04-03 - Phil Sutter
# /sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE # /sbin/iptables -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT # /sbin/iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT You should now be NATing. You can test this by pinging an external address from one of your internal hosts.
Dec 09, 2019 · iptables -F We used the -F switch to flush all existing rules so we start with a clean state from which to add new rules. iptables -A INPUT -i lo -j ACCEPT Now it's time to start adding some rules. We use the -A switch to append (or add) a rule to a specific chain, the INPUT chain in this instance. To use this file, your kernel and iptables must have NETMAP support included. The columns in the file are as follows (where the column name is followed by a different name in parentheses, the different name is used in the alternate specification syntax).
Jun 16, 2020 · What is Iptables, and How Does It Work? Simply put, iptables is a firewall program for Linux.It will monitor traffic from and to your server using tables.These tables contain sets of rules, called chains, that will filter incoming and outgoing data packets.
Apr 11, 2020 · Basic iptables howto. Iptables is a firewall, installed by default on all official Ubuntu distributions (Ubuntu, Kubuntu, Xubuntu). When you install Ubuntu, iptables is there, but it allows all traffic by default. Ubuntu comes with ufw - a program for managing the iptables firewall easily.