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bellocarico
Beginner

on ‎26-06-2023 13h13

1,932 Views
Message 1 of 11

If BT really blocking traffin inbound towards my router?

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!

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10 REPLIES 10
licquorice
Distinguished Sage
Distinguished Sage

on ‎26-06-2023 13h22

1,918 Views
Message 2 of 11

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

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.

 

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bellocarico
Beginner

on ‎26-06-2023 13h29

1,909 Views
Message 3 of 11

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

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.

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bellocarico
Beginner

on ‎26-06-2023 13h40

1,897 Views
Message 4 of 11

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

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

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licquorice
Distinguished Sage
Distinguished Sage

on ‎26-06-2023 13h46

1,892 Views
Message 5 of 11

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

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

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bellocarico
Beginner

on ‎26-06-2023 13h51

1,881 Views
Message 6 of 11

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

109.148.166.253

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bellocarico
Beginner

on ‎26-06-2023 13h56

1,871 Views
Message 7 of 11

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

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

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bellocarico
Beginner

on ‎26-06-2023 14h02

1,862 Views
Message 8 of 11

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

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.

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bellocarico
Beginner

on ‎26-06-2023 15h10

1,810 Views
Message 9 of 11

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

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.

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licquorice
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Distinguished Sage

on ‎26-06-2023 15h11

1,808 Views
Message 10 of 11

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

@bellocarico wrote:

109.148.166.253

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

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