Re: [Dnsmasq-discuss] DNSMASQ used to force redirection for testing. IPv6 transport issue.

[Geert Stappers]

On 07-06-2019 16:48, Mcginniss, David S wrote:

> All,
>
>  
>
> I have loaded DDWRT on a small router and I am having the issue as
> follows.
>
>  
>
> I have set an IP for a FQDN as follows.
>
>  
>
> listen-address=127.0.0.1
>
Why  listen on localhost?   ( please elaborate that configuration
decission )


> listen-address=::1
>
> address=/FQDN/XXX.XXX.XXX.XXX
>
> The if a WiFi UE makes an A record query over IPv4 transport all is
> well and I am able to force connection to the XXX.XXX.XXX.XXX node I
> am testing.  The GTM serving the DNS has many geographic nodes and
> within regions many nodes served round robin.  The problem is when
> dual stack clients attach they prefer IPv6 and will send their A
> record query out over IPv6 and get another IP from the GTM pool. This
> is correct behavior the devices do both  and A record searches
> over IPv6. 
>
>  
>
> It is these clients that I am testing with and to make testing valid I
> need to leave them in out of the box condition.
>
>  
>
> I need to have the Router reply to the IPv6 A record query with my
> fixed address and I haven’t been able to figure out how to force it to
> do so.
>

FWIW    I haven't been able to figure out what the use case is.


>  
>
> Anyone who has already tackled this and could enlighten me from this list?
>
>  
>
>

Regards

Geert Stappers


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[Dnsmasq-discuss] DNSMASQ used to force redirection for testing. IPv6 transport issue.

[Mcginniss, David S [CTO]]

All,

I have loaded DDWRT on a small router and I am having the issue as follows.

I have set an IP for a FQDN as follows.

listen-address=127.0.0.1
listen-address=::1
address=/FQDN/XXX.XXX.XXX.XXX
The if a WiFi UE makes an A record query over IPv4 transport all is well and I 
am able to force connection to the XXX.XXX.XXX.XXX node I am testing.  The GTM 
serving the DNS has many geographic nodes and within regions many nodes served 
round robin.  The problem is when dual stack clients attach they prefer IPv6 
and will send their A record query out over IPv6 and get another IP from the 
GTM pool. This is correct behavior the devices do both  and A record 
searches over IPv6.

It is these clients that I am testing with and to make testing valid I need to 
leave them in out of the box condition.

I need to have the Router reply to the IPv6 A record query with my fixed 
address and I haven't been able to figure out how to force it to do so.

Anyone who has already tackled this and could enlighten me from this list?


David S. McGinniss
Sr. Telecom Engineer
O: 913-315-0262 /M 630-926-3184
david.mcginn...@sprint.com
[Macintosh HD:Users:stephanie.laemoa:Desktop:moveforward_1.png]

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