[1.1.87][switch] Can't join multiplayer game

[koypl]

When i try to join someone there will show up "could not establish network communication with server" and
when i try to host game show up "failed to determine external ip address"

[Twinsen]

Unfortunately since multiplayer is peer to peer you might have problems connecting to some players depending on you ISP.

Try forwarding port 34197 in your router.
https://wiki.factorio.com/Multiplayer

[koypl]

I don't know how to do it bcuz none of tutorials show on my router

[Twinsen]

Name: Factorio
Protocol: TCP+UDP (or UDP)
WAN Host IP Address: 0.0.0.0 ~ 255.255.255.255 (or your external IP address shown on https://whatismyipaddress.com/ for example)
LAN Host: The IP address of your Nintendo Switch, shown in System Setting -> Internet -> IP address
WAN Port: 34197 ~ 34197
LAN Host Port: 34197 ~ 34197

[koypl]

thx i solve my problem