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VPN connected but cannot reach internal devices

Schoflemen79
Level 1
1 of 5

Hey guys,

 

I set up the Swisscom VPN and can establish a connection. However, once connected, I cannot reach ANY devices on my internal network, not even the router. It turns out I have a 32-bit subnet mask (255.255.255.255), so I'm essentially in a network with... myself. If I add a static route 192.168.1.0/24 and use my assigned internal (VPN) IP address as the gateway, everything works fine.

 

My question is: why am I getting a 32-bit mask and how can I get a regular 24-bit mask so I needn't create a static route every time?

 

Thanks 🙂

Tom

4 Comments 4
Doremi
Level 1
2 of 5

@Schoflemen79 

 

Hello

 

 

If you are testing the vpn from home with a PC etc. in Wi-Fi it will not work. To test the vpn you must be in 4G or 5G connection.

 

 

Cordially Doremi

Mystrom & La pomme croquée
Schoflemen79
Level 1
3 of 5

Thanks! I'm abroad right now, so definitely dialing into my network from outside of it.

Black Mamba
Level 1
4 of 5

@Schoflemen79 

 

thanks for contribution and the feedback

 

to complete the answer / solution @Doremi 

 

this recent discussion can help

Report on good VDSL2 experience with Zyxel XMG3927... | Swisscom Community

post @lucaberta 27.11.2020 17:03

" ... The IPv4 Mask Length is 0, which means that the whole IPv4 address (32 bits) is mapped in the IPv6 address.

The Service Provider IPv6 Prefix is used as the main supernet in which 6RD maps the IPv4 32 bits plus the local interface addresses. ... "

 

also in the german Community

XMG3927-B50A u. Wingo?! | Swisscom Community

the first post 17.03.2020 22:50

" ... Für IPv6 kannst du 6RD konfigurieren, indem du 6rd.wingo.ch als Gateway, 2a02:21b0::/32 als IPv6-Netzwerk und eine Netzmaske (bit mask length) IPv4 von 0 verwendest. Die MTU ist 1480 Bytes. ... "

" ... You can configure 6RD for IPv6 by using 6rd.wingo.ch as gateway, 2a02: 21b0 :: / 32 as IPv6 network and a network mask (bit mask length) IPv4 of 0. The MTU is 1480 bytes. ... "

Schoflemen79
Level 1
5 of 5

Thank you so much for sharing this! Honestly, I haven't been a systems engineer in many years and was never a network engineer. So IPv6 and 6RD are a little over my head.

 

I think I understand, though, that for VPN to work properly, I need a router over which I have more control. Could you help me understand why? VPN did work when I hotspotted myself before I left home. At that time, I must have had a proper mask, otherwise I wouldn't have been able to print the test page.

 

Still a little puzzled 😊

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