unable to connect FritzBox over WAN Port

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unable to connect FritzBox over WAN Port

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
unable to connect FritzBox over WAN Port
unable to connect FritzBox over WAN Port
2024-01-28 14:02:25
Hardware Version: V2
Firmware Version: 2.2.3

Hi,

 

Last week I switched my network from AVM components to Omada with TP-Link hardware. All tp-link components are managed via SDN. My FritzBox 7590 is the last AVM device and is used as a DSL modem. LAN port 1 of the FritzBox is connected to the ER605 WAN port. I adopted the network 192.168.178.1/24 into the Omada configuration. The 7590 is now configured with the 192.168.0.1/29 network.

 

Okay, so. . . i forgot that the LAN phones are configured in my Fritzbox.. But I can't establish a connection from the internal network to the Fritzbox network. Is it possible to connect the 192.168.0.1 network from the 192.168.178.1 network via routing, NAT or whatever? Sorry for this beginner question, unfortunately I'm not a network administrator.

 

Regards

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#1
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6 Reply
Re:unable to connect FritzBox over WAN Port
2024-01-28 15:37:22

  @Hobbit76 

 

The 7590 is now configured with the 192.168.0.1/29 network.

Why /29 why not /24 ?

What's its DHCP server range set to ?

 

How is the WAN port of the ER605 configured ?

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#2
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Re:unable to connect FritzBox over WAN Port
2024-01-29 06:02:07

Hi @Hobbit76 

Thanks for posting in our business forum.

1. I would not recommend you set up with two routers. Remove one if you don't know about the NAT which is the most straightforward way out.

2. If you insist on using two routers, set up a NAT port forward or DMZ. Note if there is an issue with the double-NAT and blocking certain traffic, that would take twice port forwarding in some situations.

3. From the current setup, ER707-M2 LAN to FritzBox LAN, there should be a trouble-free connection because devices in the LAN(707-M2) can access the WAN(707-M2) IPs as they are located in the same subnet.

 

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#3
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Re:unable to connect FritzBox over WAN Port
2024-01-29 14:12:45

  @MisterW 

 

The Fritzbox does not require a /24 network. It's just supposed to be a transfer network. She only has one device, the router. A /30 network without DHCP should also be enough, but I also wanted to log in to the Fritzbox, so it has a /29 network with the DHCP range 192.168.0.2 to 192.168.0.6

 

The WAN connection type is dynamic IP via DHCP.

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#4
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Re:unable to connect FritzBox over WAN Port
2024-01-29 14:53:22 - last edited 2024-01-29 14:54:11

  @Hobbit76 

 

The Fritzbox does not require a /24 network. It's just supposed to be a transfer network. She only has one device, the router. A /30 network without DHCP should also be enough, but I also wanted to log in to the Fritzbox, so it has a /29 network with the DHCP range 192.168.0.2 to 192.168.0.6

 

Ok, that makes sense, my original concern was that the ER605 WAN had been allocated an address that was outside the LAN subnet of the Fritzbox, but that isnt the case.

 

Okay, so. . . i forgot that the LAN phones are configured in my Fritzbox

 

So do they have addresses in the 192.168.0.2 to 192.168.0.6 range ?

 

Given your setup, yes you will have a double NAT which is not ideal for some situations, but you should be able to access anything in the 192.168.0.1/29 subnet from the ER605 LAN. The ER605 will just treat any 192.168.0.1/29 destination address as being outside its lan ( 192.168.178.1/24 ) .and thus it will route it via the WAN port, performing a NAT translation as it does. So now its source is the WAN IP of the ER605 (192.168.0.3) and so is now local to the Fritzbox LAN. Any reply will go back via the reverse route and be un-natted.

So it should just work...

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#5
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Re:unable to connect FritzBox over WAN Port
2024-02-13 08:54:28

MisterW wrote

The ER605 will just treat any 192.168.0.1/29 destination address as being outside its lan ( 192.168.178.1/24 ) .and thus it will route it via the WAN port, performing a NAT translation as it does. So now its source is the WAN IP of the ER605 (192.168.0.3) and so is now local to the Fritzbox LAN. Any reply will go back via the reverse route and be un-natted.

So it should just work...

  You're right.

 

My LAN phones are working now. SIP requires a domain and the Omada solution does not provide local DNS. I have configured a Pihole and am using this as the primary DNS. fritz.box is now known as 192.168.0.1 and SIP telephony works.

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#6
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Re:unable to connect FritzBox over WAN Port
2024-02-13 09:51:25

  @Hobbit76 

 

SIP requires a domain

 

That's a new one on me. Is it just a requirement of SIP on the Fritzbox ? 

At least you have it working now

 

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#7
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