[cs615asa] DNS with aws public IP problem

Xuyang Weng xweng at stevens.edu
Mon Mar 19 17:17:21 EDT 2018


Hi Yifang,

I did not try private IP, but public IP works for me. Did you check the
firewall rules?


On Mon, Mar 19, 2018 at 5:09 PM, Yifang Yuan <yyuan17 at stevens.edu> wrote:

> Hi All:
> Does anyone set client name-server to DNS server’s public IP? My client
> works with DNS server’s private address, but not public.
>
> Let me specific:
> 1 My DNS server(AWS) private ip is 172.31.33.1 and public is 51.51.51.51.
> 2 My DNS client(AWS)’s name-server is set to 172.31.33.1. Client could
> resolve domain name.
> 3 My DNS client(AWS)’s name-server is set to 51.51.51.51. *Client can’t
> resolve domain name.*
> 4 My Macbook’s name-server is set to 51.51.51.51. My laptop could resolve
> domain name.
>
> Name-sever is set in /etc/resolv.conf. I use dig to confirm the
> configuration is loaded.
> Because the dns public ip works on my laptop, I suppose AWS limit the
> access from inside to themselves public address. Is it true? Thank you.
>
> Yifang
>
>
>
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