fwd is a network port forwarder written in golang.
It's cross platform, supports multiple architectures and it's dead simple to use.
Read all about it in this article.
I must admit ngrok was an huge inspiration for fwd. If you don't know the tool you should definitely check out this talk from @inconshreveable.
This tool combo (fwd + ngrok) allows some wicked mischief, like taking firewall hole punching to another level! And the setup is trivial.
ngrok allows to expose a local port on a public endpoint and fwd allows to connect a local port to a remote endpoint. You see where I'm heading with this... With both tools you can connect a public endpoint to a remote port as long as you have access to it.
Here's how it works:
+---------+ +---------+
:9000 | | 172.28.128.3:22 | |
Internet +------------------> | fwd | +------------------------> | ssh |
tcp.ngrok.io:1234 | | 172.28.128.1 | |
+---------+ +---------+
# get a public endpoint, ex: tcp.ngrok.io:1234
ngrok tcp 9000
# forward connections on :9000 to 172.28.128.3:22
fwd --from :9000 --to 172.28.128.3:22
# get a shell on 172.28.128.3 via a public endpoint
ssh tcp.ngrok.io -p 1234
With great power comes great responsibility. - Ben Parker
Forwarding a local port to a remote port on a different network:
+---------+ +---------+
192.168.1.99:8000 | | 172.28.128.3:80 | |
curl +---------------------> | fwd | +-------------------------> | web |
| | 172.28.128.1 | |
+---------+ +---------+
Get the binaries or build it yourself.
Download prebuilt binaries for several platforms and architectures:
go get github.com/kintoandar/fwd
go install github.com/kintoandar/fwd
NAME:
fwd - The little forwarder that could
USAGE:
fwd --from localhost:2222 --to 192.168.1.254:22
VERSION:
0.1.0
AUTHOR(S):
Joel Bastos <[email protected]>
COMMANDS:
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS:
--from value, -f value source HOST:PORT (default: "127.0.0.1:8000") [$FWD_FROM]
--to value, -t value destination HOST:PORT [$FWD_TO]
--list, -l list local addresses
--udp, -u enable udp forwarding (tcp by default)
--help, -h show help
--version, -v print the version
COPYRIGHT:
MIT License
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