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Aspirant

RBK852 Nat loopback bug on satellite

I have a domainname setup to access the NAS on my network. For example mydomain.com


When I go to this domain on an external network, so out of home or on my phone provider, everything works fine.
When I do this when connected to the main router of the RBK852 set, again everything works fine.

When I am connected to the satellite however, it doesn't. Seems like a NAT loopback issue? 

Message 1 of 20
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Guru

Re: RBK852 Nat loopback bug on satellite

Something to contact NG support about and get additional help and information on. 


My Setup (Cable 900Mbps/50Mbps)>CAX80>Orbi RBK50 v2.5.1.16(Router Mode)
Additional NG HW: C7800/CM1100/CM1200, Orbi CBK40, Orbi RBK50/RBK853, R7800, R7960P, EX7500/EX7700, XR450 and WNHDE111
Message 2 of 20
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Aspirant

Re: RBK852 Nat loopback bug on satellite

Found out the issue only exists when the satellite is connected with a cable for backhaul . When it is connected wirelessly it works as expected.

Support won't do any good. I thought bugs were meant to be reported here?
Message 3 of 20
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Guru

Re: RBK852 Nat loopback bug on satellite

No, contact and report the bug there with support.

 

When the RBS is wire connected, is it directly connected to the RBR or is there switch in between? 


My Setup (Cable 900Mbps/50Mbps)>CAX80>Orbi RBK50 v2.5.1.16(Router Mode)
Additional NG HW: C7800/CM1100/CM1200, Orbi CBK40, Orbi RBK50/RBK853, R7800, R7960P, EX7500/EX7700, XR450 and WNHDE111
Message 4 of 20
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Aspirant

Re: RBK852 Nat loopback bug on satellite

A Netgear prosafe switch is between the RBR and the RBS.
Message 5 of 20
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Guru

Re: RBK852 Nat loopback bug on satellite

What is the model# of the ethernet switch in the configuration?

 

To rule out the switch causing problems, directly connect the RBS the back of the RBR and test again with out the switch. 


My Setup (Cable 900Mbps/50Mbps)>CAX80>Orbi RBK50 v2.5.1.16(Router Mode)
Additional NG HW: C7800/CM1100/CM1200, Orbi CBK40, Orbi RBK50/RBK853, R7800, R7960P, EX7500/EX7700, XR450 and WNHDE111
Message 6 of 20
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Apprentice

Re: RBK852 Nat loopback bug on satellite

Yep, it's a bug. Apparently, only select devices in Netgear's line up were chosen to receive standard functionality that meets RFCs.

 

Please ignore @FURRYe38 posts. They either don't know what they're talking about, or in the few cases where they do, choose to ignore it (the NAT loopback issue in particular was discussed here multiple times.)

Message 7 of 20
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Aspirant

Re: RBK852 Nat loopback bug on satellite

An 800 Euro Mesh system that doesn't have the basic functionality of a 75 euro router... Smiley Sad

If only that was the only shortcoming of this overpriced system.
Message 8 of 20
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Guru

Re: RBK852 Nat loopback bug on satellite

Would be great to know if this happens with out the switch in line as well. Trying to gather some info. 

What is the model# of the ethernet switch in the configuration?

 

If loopback is working with the RBR and not the RBS, lets try to figure out the RBS issue. Maybe if we can gather some info, we can work with NG on this. Smiley Wink

 

Well if it's still a problem for you then ether contact NG support and let them know about it or return it and find something that works for you. 

 

 


@phusebox wrote:
An 800 Euro Mesh system that doesn't have the basic functionality of a 75 euro router... Smiley Sad

If only that was the only shortcoming of this overpriced system.




My Setup (Cable 900Mbps/50Mbps)>CAX80>Orbi RBK50 v2.5.1.16(Router Mode)
Additional NG HW: C7800/CM1100/CM1200, Orbi CBK40, Orbi RBK50/RBK853, R7800, R7960P, EX7500/EX7700, XR450 and WNHDE111
Message 9 of 20
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Aspirant

Re: RBK852 Nat loopback bug on satellite

I will test it some more and come back on this. It might even be that the wifi part does support it and the Ethernet part doesn't. Will test that as well as without the switch. Replacing the switch for another one would be an easy and cheap solution.
Message 10 of 20
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Guru

Re: RBK852 Nat loopback bug on satellite

Please post the model # of the switches you have. There are some odd issues with switches that can cause problems. 

 


My Setup (Cable 900Mbps/50Mbps)>CAX80>Orbi RBK50 v2.5.1.16(Router Mode)
Additional NG HW: C7800/CM1100/CM1200, Orbi CBK40, Orbi RBK50/RBK853, R7800, R7960P, EX7500/EX7700, XR450 and WNHDE111
Message 11 of 20
Highlighted
Aspirant

Re: RBK852 Nat loopback bug on satellite

The switch that is between the RBR and RBS is a Netgear GS105E.

Message 12 of 20
Highlighted
Guru

Re: RBK852 Nat loopback bug on satellite

This is a smart managed switch. Can you disable IGMP protocols and any green ethernet features on this switch? 


My Setup (Cable 900Mbps/50Mbps)>CAX80>Orbi RBK50 v2.5.1.16(Router Mode)
Additional NG HW: C7800/CM1100/CM1200, Orbi CBK40, Orbi RBK50/RBK853, R7800, R7960P, EX7500/EX7700, XR450 and WNHDE111
Message 13 of 20
Highlighted
Aspirant

Re: RBK852 Nat loopback bug on satellite

It seems I am gonna have to reset it, as my login credentials don't seem to work anymore. Nor do the default settings.

Message 14 of 20
Highlighted
Guru

Re: RBK852 Nat loopback bug on satellite

Please try the RBS directly connected to the RBR as well with out the switch connected...


My Setup (Cable 900Mbps/50Mbps)>CAX80>Orbi RBK50 v2.5.1.16(Router Mode)
Additional NG HW: C7800/CM1100/CM1200, Orbi CBK40, Orbi RBK50/RBK853, R7800, R7960P, EX7500/EX7700, XR450 and WNHDE111
Message 15 of 20
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Apprentice

Re: RBK852 Nat loopback bug on satellite

Please don't waste time following @FURRYe38 "advice." The lack of NAT loopback support has probably nothing to do with your Layer 2 hardware.  It's (a) documented - your device is not on the list of those supporting NAT loopback.

 

It's likely due to the age of the software in the device. It uses a kernel module called "ACOS" which, based on the header files published by NG, dates back to 2005 and earlier - it's based on some previous VxWorks software written by Hon Hai Precision Ind. Co. Ltd. (better known as Foxconn.)  The recommendations for NAT hairpinning are from 2008, so they are probably having trouble implementing them in a 2020 consumer device!.

 

 

Message 16 of 20
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Aspirant

Re: RBK852 Nat loopback bug on satellite

Well, the funny thing is it does work when the satellite is not connected to a cable backhaul or when the client is connected to the router.
Message 17 of 20
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Apprentice

Re: RBK852 Nat loopback bug on satellite

"connected to the router" with an Ethernet cable without a switch in between, or connected via wireless? Make sure you have the wireless turned off.

 

Those are different interfaces inside the devices.  I tested on mine running "nc" directly on the router (so coming from 127.0.0.1) and it didn't work. Inside the router, there are multiple interfaces from which packets can be received.  Wired and wireless use different interfaces. The port forwarding rules must accommodate both.

 

The router generally can't tell if there's a switch between its wired interface and the client or not.  All Layer 2 protocols are designed to be transparent in this respect, especially with unmanaged switches, which are simple frame forwarders (plus some learning of the topology of your home network). Not that it's impossible for the switch to play a role, but just very, very unlikely.

Message 18 of 20
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Aspirant

Re: RBK852 Nat loopback bug on satellite

Will try again just with Ethernet and without WiFi.
Message 19 of 20
Highlighted
Guru

Re: RBK852 Nat loopback bug on satellite

Wow, thats facinating. Smiley Wink

 

Now can you fully disable ALL IGMP protocols and any green ethernet features on the switches management web page to see if the switch will change the behavior? I presume there maybe one or both of these features that could be interferring with the lookback behavior. If not, try a non managed, non green ethernet switch. I use HP Procurve 1400/1800 series for my network

 

 


@phusebox wrote:
Well, the funny thing is it does work when the satellite is not connected to a cable backhaul or when the client is connected to the router.

 


My Setup (Cable 900Mbps/50Mbps)>CAX80>Orbi RBK50 v2.5.1.16(Router Mode)
Additional NG HW: C7800/CM1100/CM1200, Orbi CBK40, Orbi RBK50/RBK853, R7800, R7960P, EX7500/EX7700, XR450 and WNHDE111
Message 20 of 20