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

[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

>

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 AAAA 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.



<David McGinniss Wrote> The use case is that I am testing Phones for Sprint where we need to test a specific node when it is first placed in service or has had new SW or has been adversely impacting customer calls. Because there are multiple elements that perform the same function where the phone has a FQDN  of say compgw.vowifi2.spcsdns.net where the device may receive many ipaddress's  from the dns query. In this use case the phone is attaching to a WiFi access point. The Router on the LAN is running DNSMASQ.  I use the "address=/ compgw.vowifi2.spcsdns.net /XXX.XXX.XXX.XXX" to set the IP address to that of the target Serving Gateway I wish to test. The problem is that the phones being IPv6 capable will make an A record query over IPv6 transport and the address I set is not used.



I cannot figure out short of disabling IPv6 altogether how to get the AP/router which is the DNS server for the attached phones to serve the address I set if the query is received over IPv6.



Do you or anyone have a solution without disabling IPv6 on the router?





> ?

>

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

>

> ?

>

>



Regards



Geert Stappers




David S. McGinniss
Sr. Telecom Engineer
O: 913-315-0262 /M 630-926-3184
david.mcginniss at sprint.com<mailto:david.mcginniss at sprint.com>
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