Hi,
i connected an android phone through l2tp client that comes with the phone from Verizon. i was unable to get the connection to allow some SIP information to pass to an application on the phone. I tried to put the server in the DMZ and still no luck. I added the open VPN client and config file to the phone and was able to get the app to communicate after doing so. i have 2 questions:
1. Do Verizon and or other providers block ports or protocols through the mobile VPN client that comes with most phones? ( I was not able to configure it since i don't have access to it)
2. is it normal that a gateway would be able to block protocols or ports in a VPN? ( i was under the impression once established on a port it could bypass firewall rules for ports or protocols since it is encrypted. The only way i could get it working was to put the VPN server in the DMZ for now.)
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Port Forwarding
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tifolahu
- Posts: 1
- Joined: Mon Feb 07, 2022 4:08 am
Port Forwarding
Last edited by tifolahu on Wed Jun 22, 2022 4:42 am, edited 1 time in total.
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nobody12
- Posts: 139
- Joined: Sat Feb 13, 2021 10:22 pm
Re: Port Forwarding
Did you use Softether as the VPN-Server?
regarding Q1:
L2TP over IPSec is a protocol which does not pass any proxy or firewall easily. Also unlikely it works good when the client is in an IPV6 network or behind Carrier NAT.
regarding Q2:
If you have a router which itself has the ability to be a IPSec VPN Server, chances are good it will not be able to let IPSec passthrough. Then, a simple port forwarding will not be sufficent to make IPSec work. Server and client have to be NAT-T compatible.
IPSec works best for Lan2LAn connections where the endpoint of the connection is at the internet gateway.
regarding Q1:
L2TP over IPSec is a protocol which does not pass any proxy or firewall easily. Also unlikely it works good when the client is in an IPV6 network or behind Carrier NAT.
regarding Q2:
If you have a router which itself has the ability to be a IPSec VPN Server, chances are good it will not be able to let IPSec passthrough. Then, a simple port forwarding will not be sufficent to make IPSec work. Server and client have to be NAT-T compatible.
IPSec works best for Lan2LAn connections where the endpoint of the connection is at the internet gateway.
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amisaxd
- Posts: 1
- Joined: Fri Jan 28, 2022 6:07 am
Re: Port Forwarding
I Also got similar question regarding connecting to l2tp client..tifolahu wrote: ↑Mon Feb 07, 2022 5:20 amHi,
i connected an android phone through l2tp client that comes with the phone from Verizon. i was unable to get the connection to allow some SIP information to pass to an application on the phone. I tried to put the server of kmspico 11 in the DMZ and still no luck. I added the open VPN client and config file to the phone and was able to get the app to communicate after doing so. i have 2 questions:
1. Do Verizon and or other providers block ports or protocols through the mobile VPN client that comes with most phones? ( I was not able to configure it since i don't have access to it)
2. is it normal that a gateway would be able to block protocols or ports in a VPN? ( i was under the impression once established on a port it could bypass firewall rules for ports or protocols since it is encrypted. The only way i could get it working was to put the VPN server in the DMZ for now.)