Telkom UDP ports blocked?

[RoLeLu]

I'm currently using Telkom unrestricted apn and trying to open ports for UDP to no success. TCP ports open just fine but when I try to open UDP ports they seem to stay closed.


Am I doing anything wrong here? Has any one else had any problems opening trying to UDP ports on Telkom unrestricted APN?

 

[Rickster]

I'm currently using Telkom unrestricted apn and trying to open ports for UDP to no success. TCP ports open just fine but when I try to open UDP ports they seem to stay closed.
View attachment 1649387
Am I doing anything wrong here? Has any one else had any problems opening trying to UDP ports on Telkom unrestricted APN?

What router is this?

 

[RoLeLu]

What router is this?

It's an android app called SerialTest

 

[Rickster]

It's an android app called SerialTest

Don't you have to open the port on the router?

 

[Retro1337]

I'm currently using Telkom unrestricted apn and trying to open ports for UDP to no success. TCP ports open just fine but when I try to open UDP ports they seem to stay closed.
View attachment 1649387View attachment 1649389
Am I doing anything wrong here? Has any one else had any problems opening trying to UDP ports on Telkom unrestricted APN?

Public IP is visible at bottom of first picture btw.

 

[RoLeLu]

Oh

Public IP is visible at bottom of first picture btw.

Oh yeah, thanks for pointing that out, I'll just reset my network

Edit: Covered the IP up, (not that it matters much now :|)

 

[RoLeLu]

Don't you have to open the port on the router?

It's an app that allows you to run a server from your phone among other things, and the options to set a port are in it. You set a port number in the app and then run the server and it should open the ports which you designated.

 

[netstrider]

It's an app that allows you to run a server from your phone among other things, and the options to set a port are in it. You set a port number in the app and then run the server and it should open the ports which you designated.

Is the Telkom sim in your phone or in an LTE router?

 

[RoLeLu]

Is the Telkom sim in your phone or in an LTE router?

Phone

 

[netstrider]

Phone

You will have to open the ports directly on the phone then. Not sure if that will be possible but there may be some way.

 

[RoLeLu]

You will have to open the ports directly on the phone then. Not sure if that will be possible but there may be some way.

I have attempted that with the above app as well as another port forwarding app and both have the same results (TCP ports can open but UDP ports seem to stay closed). Maybe it would only open if someone were to send UDP packets to me(?) Just was wondering if Telkom unrestricted apn blocks UDP packets if anyone can answer this question.

 

[netstrider]

I have attempted that with the above app as well as another port forwarding app and both have the same results (TCP ports can open but UDP ports seem to stay closed). Maybe it would only open if someone were to send UDP packets to me(?) Just was wondering if Telkom unrestricted apn blocks UDP packets if anyone can answer this question.

A service needs to actively run on that port otherwise the port will list as closed even if it is forwarded, in my experience.

 

[RoLeLu]

A service needs to actively run on that port otherwise the port will list as closed even if it is forwarded, in my experience.

I see..

Well I've tested it again; this time using Tailscale which only uses UDP afaik for establishing connections with other peers and it worked.

I guess UDP ports close faster than TCP ports when traffic stops running through them, but they do seem to be opening after all

 

[netstrider]

I see..

Well I've tested it again; this time using Tailscale which only uses UDP afaik for establishing connections with other peers and it worked.

I guess UDP ports close faster than TCP ports when traffic stops running through them, but they do seem to be opening after all

Likely closed once the last packet is transmitted because there is no handshake to keep the connection alive.