Is there any config option to disable public network connection? about torrent

[anacrolix]

You can use the IPBlocklist option in Config, http://godoc.org/github.com/anacrolix/torrent#Config. Set IP ranges that block everything you don't want. There are only a few private network ranges in IPv4, so it should only take a few ranges. Or you could just block all the ranges you're not interested in. Here's an example based on common ranges:

Public network:0.0.0.0-9.255.255.255
Public network:11.0.0.0-126.255.255.255
Public network:128.0.0.0-192.167.255.255
Public network:192.169.0.0-255.255.255.255

This would allow 10/8, 127/8, 192.168/16. You could create this using http://godoc.org/github.com/anacrolix/torrent/iplist#NewFromReader, see the tests for examples: https://github.com/anacrolix/torrent/blob/master/iplist/iplist_test.go#L14.

See https://en.wikipedia.org/wiki/Reserved_IP_addresses

There's also the Config.DisableIPv6 option, if you don't want to have to deal with IPv6.

[anacrolix]

Can I get your thoughts on this? A few people have mentioned the use of this project for private clouds. Perhaps a config option/pull-request/supplementary package is in order to facilitate this.