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added faq on multiple supernode ports

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Logan007 2020-09-16 14:49:09 +05:45
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doc/Faq.md
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@ -26,12 +26,20 @@ You can request the current status by just sending a new line, i.e. pressing [EN
### Is there support for multiple supernodes?
As of now, one additional supernode is supported. The additional supernode is handled in a backup-fashion: A reserve-supernode can be started if one fails. The reserve-supernode just has to be known to the edges beforehand (simply by an additional `-l <ip:port>` at the edge).
Actively using several in parallel will have your network fall apart (partitioned – some edges connected to one supernode, some to another).
Actively using several supernodes in parallel will have the network fall apart (partitioned – some edges connected to one supernode, some to another).
Considering these known limitations, current discussions however seem to move more towards a fully p2p-approach which then would require no supernode at all, every node might be equal highly increasing network resilience.
Considering these known limitations, current discussions however seem to include thoughts on increasing supernode reliability as well as fall-back mechanisms and might even shift more towards a full p2p-approach which then would not require a supernode at all, every node could be equal highly increasing network resilience.
### Can a supernode listen on multiple ports?
The supernode itself can only listen on one port. However, your firewall might be able to map additional UDP ports to the supernode's regular port:
`sudo iptables -t nat -A PREROUTING -i <network interface name> -d <supernode's ip address> -p udp --dport <additional port number> -j REDIRECT --to-ports <regular supernode port number>`
This command line can be put down as additional `ExecStartPost=` line (without `sudo`) in the supernode's `.service` file which can hold several such lines if required.
## Edge