[cs615asa] DNS with aws public IP problem

[Hongkun Zhang]

Maybe the security group in ec2 block the ups and icmp data. If so, you
need add the ups and icmp rules to your security group.

Xuyang Weng <xweng at stevens.edu>于2018年3月19日 周一17:23写道：

> 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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