Controlling which interface named uses

[Ondřej Surý]

The other approach might be the up/down scripts on your ppp connection that will reconfigure the query-source(-v6) address as the connection is established or tore down.

Ondřej
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Ondřej Surý — ISC (He/Him)

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> On 10. 6. 2023, at 19:24, Ondřej Surý <ondrej at isc.org> wrote:
> 
> You are over-complicating things. If unconfigured, named binds the outgoing UDP to 0.0.0.0 (::0), which means the chosen IP address is picked by the kernel. You need to configure priorities on your interfaces in the kernel - ip route is your friend.
> 
> And for goddess’ sake, don’t do anything wild like proposed round robin across default routes. That would be a living hell to debug.
> 
> Ondřej
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> Ondřej Surý — ISC (He/Him)
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> My working hours and your working hours may be different. Please do not feel obligated to reply outside your normal working hours.
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>> On 10. 6. 2023, at 18:55, Alessandro Vesely <vesely at tana.it> wrote:
>> 
>> On Fri 09/Jun/2023 18:32:25 +0200 Anand Buddhdev wrote:
>>>>> On 09/06/2023 17:26, Alessandro Vesely wrote:
>>>>> Having two WANs, it would be reasonable, in case one doesn't work, to try the other one.  However, it's always useless to try the LAN.  Is there any way to configure which interface is used for outgoing queries?
>>> You can configure "query-source" and "query-source-v6" in named.conf, to tell BIND which interface to use for outgoing queries.
>> 
>> 
>> Thank you, Anand; I hadn't found those statements.  However, they take a single address only.
>> 
>> I'm not as much concerned about IP version as about availability.  Enabling IPv6 looks nice as I see queries going out through an interface which is not the default.  But will named turn back to the default interface in case the IPv6 link goes down?
>> 
>> Keep in mind that links sometimes seem to be up, as they're connected to a PPP peer or router, for example, but don't actually work.  Knowing that UDP entails multiple attempts, it would be great to have, say, even attempts on wan0 and odd ones on wan1.  If that's not possible, perhaps I could look for ways to configure it using dscp.  Any hint?
>> 
>> 
>> Best
>> Ale
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