Convert nf_tables to iptables (legacy) of synology container

iptables -t nat -I POSTROUTING 1 -s 10.0.0.1/24 -o eth0 -j MASQUERADE Warning: Extension MASQUERADE revision 0 not supported, missing kernel module? iptables v1.8.11 (nf_tables): Could not fetch rule set generation id: Invalid argument

How to convert nf_tables to iptables lecagy in docker

When installing the WireGuard kernel on Synology 7.x, since there is no official kernel for WireGuard, it’s necessary to install wg from the internet. wgDashboard is one option to consider. However, because nf_tables is used by default for Docker containers, any commands related to PostUp or PreUp will not work with nf_tables.

Solution to change nf_tables to iptables legacy

Enter docker that we need to change using command: 

sudo docker exec -it wgdashboard /bin/bashcode-box

Next: 

apk add iptables-legacycode-box

Next:

ln -sf /usr/sbin/iptables-legacy /usr/sbin/iptablescode-box

Check and verify:

iptables --versioncode-box

Done, Now you can run some thing like: iptables -t nat -I POSTROUTING 1 -s 10.0.0.1/24 -o eth0 -j MASQUERADEcode-box