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No internet on ASA with outside int static ip but works with DHCP

tater0214
Level 1
Level 1

I am very new to all of this and have just been going off of videos and numerous forum posts to set everything up and trying to learn. I have an ASA 5510 for home use and I am unable to get internet access to the inside interface whenever I use a static ip for the outside interface but everything works fine if I use DHCP on the outside. I need a static ip I believe so I can open port 443 on my router to allow vpn to function. What's even stranger is that I have some aironet 3602i access points running in autonomous mode for wifi on the inside network and when I use the static ip on the asa the 5G network works fine but the 2.4G does not and chrome returns "server IP address could not be found." when trying to load a webpage but when I use DHCP on the asa both networks work. I am stumped and any help is greatly appreciated. It also seems like a computer connected to the inside via ethernet can access the internet fine but cannot ping my router on the outside (192.168.0.1) nor something like 8.8.8.8. I have posted both the static and dhcp configs and can post the aironet configs if needed.

1 Accepted Solution

Accepted Solutions

with DHCP
the ASA as DHCP client receive DNS IP from ISP and forward it to Inside client via 
ddhcp auto-config outside interface inside 

this make client have DNS IP and can use DNS lookup.

when you config static IP in Outside, and you dont not specify DNS IP the Inside client can not resolve IP and connect failed.

so with static config DNS for DHCP Inside client.

View solution in original post

2 Replies 2

with DHCP
the ASA as DHCP client receive DNS IP from ISP and forward it to Inside client via 
ddhcp auto-config outside interface inside 

this make client have DNS IP and can use DNS lookup.

when you config static IP in Outside, and you dont not specify DNS IP the Inside client can not resolve IP and connect failed.

so with static config DNS for DHCP Inside client.

Ok it was 2 issues, one was like you mentioned the dns, the other was that ICMP was not enabled causing the ping to not work. I still technically had internet working before but it was only on the 5G wifi and ethernet on the inside but not on the 2.4G for some reason but after changing some dns settings both networks started working. If anyone knows why this is I'd like to learn why but I am not complaining either way since it is working now. Thanks for the help 

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