This topic

If BT really blocking traffin inbound towards my router?

bellocarico — Mon, 26 Jun 2023 12:13:26 GMT

Rhetoric question... any port forwarding I setup on my device doesn't work.

I have my own device that works find on Virgin Media, I just plug BT in and all of the sudden all the services I have on the router (VPN to mention one) are not reachable.

I have verified this in two ways:

- https://canyouseeme.org

- locally on my router using tcpdump. No even a SYN is received on the opened port.

Can anyone confirm this is wanted and expected behavior?

I'm still within the 14 days cooling off period so this is a decision making point for me.

Thanks!

Re: If BT really blocking traffin inbound towards my router?

licquorice — Mon, 26 Jun 2023 12:22:37 GMT

BT don't block traffic.

If you are running a VPN, your perceived public IP address won't be the public IP address of the hub.

Re: If BT really blocking traffin inbound towards my router?

bellocarico — Mon, 26 Jun 2023 12:29:25 GMT

VPN inbound not outbound, also this VPN doesn't set the default gateway it's site-to-site.

As mentioned there is no SYN received on the device I'm using although connectivity outbound works.

I have just spoken to a tech support guy and he had a good point I'm going to test now:

- disable any filtering on the BT account interface and see if that help

I'll feedback soon.

Re: If BT really blocking traffin inbound towards my router?

bellocarico — Mon, 26 Jun 2023 12:40:11 GMT

Nope. All the filters are off on my account and I can get no packet inbound.

Re: If BT really blocking traffin inbound towards my router?

licquorice — Mon, 26 Jun 2023 12:46:08 GMT

Can you confirm that your public IP address as shown at https://www.whatismyip.com/ is the same as that shown by the hub.

Re: If BT really blocking traffin inbound towards my router?

bellocarico — Mon, 26 Jun 2023 12:51:26 GMT

109.148.166.253

Re: If BT really blocking traffin inbound towards my router?

bellocarico — Mon, 26 Jun 2023 12:56:06 GMT

So ping works, but I couldn't establish any TCP/UDP from the Internet.

Re: If BT really blocking traffin inbound towards my router?

bellocarico — Mon, 26 Jun 2023 13:02:02 GMT

I am testing with my own device behind the BT hub2 now using a DMZ config. Same result. Ping towards the public IP works but any other port for services I host on my router is just not reachable.

Re: If BT really blocking traffin inbound towards my router?

bellocarico — Mon, 26 Jun 2023 14:10:44 GMT

I had a lengthy call with BT Tech support. It took a while to get through the right person but eventually I could have a proper tech conversation. Friendly and emphatic but after 60 min of attempts they lifted white flag as they have no idea on what's the root cause.

Re: If BT really blocking traffin inbound towards my router?

licquorice — Mon, 26 Jun 2023 14:11:25 GMT

@bellocarico wrote:

109.148.166.253

That doesn't actually answer my question. Are the 2 IPs the same?

Re: If BT really blocking traffin inbound towards my router?

bellocarico — Mon, 26 Jun 2023 14:42:44 GMT

Yes it does. I also restarted the Hub2 got a new IP and that's the correct one.