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Confused about NAT configuration

Confused about NAT configuration

Confused about NAT configuration
Confused about NAT configuration
Sunday
Model: AD7200  
Hardware Version:
Firmware Version:

Morning!

 

I am not sure to start with beginning or simply what I am needing, so I will start short version;

 

My TP-Link is connected to my Starlink... TP-Link gets a 10.3.19.27 IP w/ 10.3.0.1 GW.

Connected to my TP-Link is a Cisco SG350XG Switch which will be in L3 as I have other vlans on SG from a diff ISP and reasons that I want to inter-connect..

The TP-Link 'LAN' will be 192.168.10.0 and Interface connecting to SG will be 192.168.10.1

SG350XG L3 Interface connecting to TP-Link will be 192.168.10.2

On SG I will create a vlan 10 w/ a Network of 172.16.2.0 and have a Static Route back to TP 'route 172.16.2.0/24 192.168.10.1' [Is this right? "for 172.16.2.0 to route to TP-Link you look here, 192.168.10.1"]

On TP-Link I will create a static route '172.16.2.0/24 192.168.10.2' [Is this right? "to find 172.16.2.0 you look here, 192.168.10.2"]

 

If this is correct so far, then next part would be NAT

Essentially I want anything 172.16.2.0 to be NAT'd to TP-Link, so I would create a dynamic NAT essentially "172.16.2.0 any any 192.168.10.0' ?

Sorry, this is where I get all confused.

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#1
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4 Reply
Re:Confused about NAT configuration
Yesterday

  @DasGoG 

 

Beware that TP-Link router doesn't understand VLANs. I believe that there\s no need of static route on the TP-Link router.(its NAT table should do the work).

On the SG you should have a static route for 172.16.2.0/24 via 192.168.10.2 to route the VLAN10 outside traffic to the TP-Link router..

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#2
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Re:Confused about NAT configuration
Yesterday

Hello

 

So I indeed tried this verbatim, and actually on 2 routers I had, but nothing. Now when I connect the TPLink router to the Starlink and a PC into the TP-Link, I have internet but when I plug TP into SG and do as ya said, nada. I wonder if it's because the Starlink router is already doing NAT and/or its own thing and maybe me doing a 2nd NAT is messing up? 
I just think it's the Starlink router not giving me good routing protocols. My only option is maybe to put it (Starlink) into bypass mode. 

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#3
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Re:Confused about NAT configuration
Yesterday - last edited Yesterday

  @DasGoG 

 

 

Actually the TP-Link router is doing a simple NAT - that's why when you connect a PC to the TP-Link router, you have an internet access.

I would configure Starlink in bypass mode - it would be easier to do a port-forwardung if you need it.Then I would revise my SG switch configuration.

A similar topic about VLAN default gateway on a Cisco Layer3 switch is discussed in this thread.

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#4
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Re:Confused about NAT configuration
18 hours ago

  @terziyski 

 

Hey 

Yeah I am also to believe that this is a double NAT thing and will put the starlink into bypass. Ill let ya know in case any one else ever has these questions.

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#5
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