Linksys wrt54g2 internet connection through ASA5520

Answered Question
Oct 25th, 2010
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I have a requirement to connect a linksys wrt54g2 for Internet and remote access through a sub interface on an ASA5520, all of the ethernet ports on the linksys are in use and can not be disconnected.  Can I use the Internet port on the Linksys to tunnel through the network back to a sub interface on the ASA to provide this connectivity?

Correct Answer by Jitendriya Athavale about 6 years 9 months ago

hi bruce,


could you please us on how your current setup is and what exactly you mean by


"Can I use the Internet port on the Linksys to tunnel through the network  back to a sub interface on the ASA to provide this connectivity?"

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Correct Answer
Jitendriya Athavale Mon, 10/25/2010 - 17:26
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hi bruce,


could you please us on how your current setup is and what exactly you mean by


"Can I use the Internet port on the Linksys to tunnel through the network  back to a sub interface on the ASA to provide this connectivity?"

bruce.thornton Mon, 10/25/2010 - 18:36
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This Linksys has 5 ports, 4 are used for Lan connections

and there is a single port labeled "Internet".

The 4 port are in use, and from a sinlge private network.  I need to provide Internet access to those 4 devices and allow for remote access to those devices via the Internet.  I want to use the port labeled Internet to provide Internet access this way.


1. Create a sub-interface on the inside interface of my ASA5520.

2. Create a global NAT for that sub-interface on the outside.

3.Create a dhcp scope on the ASA5520 for the network.

4.Create Layer 2 interface on my network and tunnel that Layer2 interface to the inside interface of the ASA5520

5. Setup ACLs and PAT for the 4 connections on the Linksys.

6. Attached the port labeled Internet to my network in the Layer 2 interface defined.


My question is can the port on the Linksys labeled Internet be configured as an access port and will the steps 1 thru 6 work in this secnerio?

Jitendriya Athavale Mon, 10/25/2010 - 19:34
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i dont think you can use that port as acces sport bcoz that is th eonlyport used for l3 connectivity in linksys



so if i understand you right you do not want to perfrom any natting on linksys bcoz of security concerns and want to use it only as switch to your internal networks


is putting the firewall first and then the linksys an option, you can use linksys as a gateway to internet


from wht i understand you have 4 networks on your inside and the asa 5520 comes with 4 gig ports and 1 fast eth port that should suffice your requirement


i hope i have understood your requirement and guiding you on right track

bruce.thornton Mon, 10/25/2010 - 19:48
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Yes I have 4 ports on the Linksys, they are all in use and I can't disconnect any of the 4 ports.  Can I disable Nat'ng on the Internet port and just use it as a router port.

Jitendriya Athavale Mon, 10/25/2010 - 20:25
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i am not sure about linksys devices but see if you can make a one to nat for the entire internal network on the linksys or i am not sure if there is an option to exempt traffic from natting


i think it should be possible to one to one nat for entire subnet if exempting the traffic from nat is not possible

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