161 lines
4.5 KiB
Groff
161 lines
4.5 KiB
Groff
.\" Man page generated from reStructuredText.
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.TH "SYNCTHING-NETWORKING" "7" "Jul 14, 2020" "v1" "Syncthing"
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.SH NAME
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syncthing-networking \- Firewall Setup
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..
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.SH PORT FORWARDS
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.sp
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If you have a NAT router which supports UPnP, the easiest way to get a working
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port forward is to make sure UPnP setting is enabled on both Syncthing and the
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router – Syncthing will try to handle the rest. If it succeeds you will see a
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message in the console saying:
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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Created UPnP port mapping for external port XXXXX on UPnP device YYYYY.
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.sp
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If this is not possible or desirable you should set up a port forward for port
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\fB22000/TCP\fP, or the port set in the \fISync Protocol Listen Address\fP setting.
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The external forwarded port and the internal destination port has to be the same
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(i.e. 22000/TCP).
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.sp
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Communication in Syncthing works both ways. Therefore if you set up port
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forwards for one device, other devices will be able to connect to it even when
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they are behind a NAT network or firewall.
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.sp
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In the absence of port forwarding, relaying may work well enough to get
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devices connected and synced, but will perform poorly in comparison to a
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direct connection.
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.SH LOCAL FIREWALL
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.sp
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If your PC has a local firewall, you will need to open the following ports for
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incoming and outgoing traffic:
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.INDENT 0.0
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.IP \(bu 2
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Port \fB22000/TCP\fP (or the actual listening port if you have changed
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the \fISync Protocol Listen Address\fP setting.)
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.IP \(bu 2
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Port \fB21027/UDP\fP (for discovery broadcasts on IPv4 and multicasts on IPv6)
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.UNINDENT
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.SS Uncomplicated Firewall (ufw)
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.sp
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If you’re using \fBufw\fP on Linux and have installed the \fI\%Syncthing package\fP <\fBhttps://apt.syncthing.net/\fP>, you can allow the necessary ports by running:
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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sudo ufw allow syncthing
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.sp
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If you also want to allow external access to the Syncthing web GUI, run:
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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sudo ufw allow syncthing\-gui
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.sp
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Allowing external access is \fBnot\fP necessary for a typical installation.
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.sp
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You can then verify that the ports mentioned above are allowed:
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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sudo ufw status verbose
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.sp
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In case you installed Syncthing manually you can follow the \fI\%instructions to manually add the syncthing preset\fP <\fBhttps://github.com/syncthing/syncthing/tree/main/etc/firewall-ufw\fP> to ufw.
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.SS Firewalld
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.sp
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If you are using [Firewalld](\fI\%https://www.firewalld.org\fP) it has included
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support for syncthing (since version 0.5.0, January 2018), and you can enable
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it with
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.INDENT 0.0
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.INDENT 3.5
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sudo firewall\-cmd –zone=public –add\-service=syncthing –permanent
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sudo firewall\-cmd –reload
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.UNINDENT
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.UNINDENT
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.sp
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Similarly there is also a syncthing\-gui service.
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.SH REMOTE WEB GUI
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.sp
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To be able to access the web GUI from other computers, you need to change the
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\fIGUI Listen Address\fP setting from the default \fB127.0.0.1:8384\fP to
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\fB0.0.0.0:8384\fP\&. You also need to open the port in your local firewall if you
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have one.
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.SS Tunneling via SSH
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.sp
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If you have SSH access to the machine running Syncthing but would rather not
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open the web GUI port to the outside world, you can access it through a SSH
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tunnel instead. You can start a tunnel with a command like the following:
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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ssh \-L 9999:localhost:8384 machine
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.sp
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This will bind to your local port 9999 and forward all connections from there to
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port 8384 on the target machine. This still works even if Syncthing is bound to
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listen on localhost only.
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.SH VIA A PROXY
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.sp
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Syncthing can use a SOCKS5 proxy for outbound connections. Please see proxying\&.
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.SH AUTHOR
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The Syncthing Authors
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.SH COPYRIGHT
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2014-2019, The Syncthing Authors
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.\" Generated by docutils manpage writer.
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.
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