[Pdns-users] pdns and default-ttl option
Hi, I use pdns with own implemented backend. Queries which is not recognised by my backend are redirected to the pdns-recursor. I'd like to change TTL value for all queries and found default-ttl option which is equal to 3600 by default, I've changed that to 300, but there is no effect and I still see arbitrary TTLs in pdns answer: powerdns.com.2596INA85.17.219.140 Is there any way to have same TTL for all queries I redirected to recursor (in my backend I set up ttl manually, so no problem with queries which can be resolved by backend)? Thank you. -- Regards, Lyfar Dmitriy ___ Pdns-users mailing list Pdns-users@mailman.powerdns.com http://mailman.powerdns.com/mailman/listinfo/pdns-users
Re: [Pdns-users] pdns and default-ttl option
On 11/4/10 12:47 PM, Dmitriy Lyfar wrote: I use pdns with own implemented backend. Queries which is not recognised by my backend are redirected to the pdns-recursor. I'd like to change TTL value for all queries and found default-ttl option which is equal to 3600 by default, I've changed that to 300, but there is no effect and I still see arbitrary TTLs in pdns answer: powerdns.com.2596INA85.17.219.140 Is there any way to have same TTL for all queries I redirected to recursor (in my backend I set up ttl manually, so no problem with queries which can be resolved by backend)? Thank you. The TTL indicated in a recursor response tells how long the recursor intends to keep that particular cached record for. It counts down from the time it was last retrieved from the master. I don't think PowerDNS has a mechanism to override that. However, it is there for a reason. -- Derrik Pates de...@devrandom.net ___ Pdns-users mailing list Pdns-users@mailman.powerdns.com http://mailman.powerdns.com/mailman/listinfo/pdns-users
Re: [Pdns-users] pdns and default-ttl option
On Thu, Nov 04, 2010 at 01:15:07PM -0600, Derrik Pates wrote: On 11/4/10 12:47 PM, Dmitriy Lyfar wrote: I use pdns with own implemented backend. Queries which is not recognised by my backend are redirected to the pdns-recursor. I'd like to change TTL value for all queries and found default-ttl option which is equal to 3600 by default, I've changed that to 300, but there is no effect and I still see arbitrary TTLs in pdns answer: powerdns.com.2596INA85.17.219.140 Is there any way to have same TTL for all queries I redirected to recursor (in my backend I set up ttl manually, so no problem with queries which can be resolved by backend)? Thank you. The TTL indicated in a recursor response tells how long the recursor intends to keep that particular cached record for. It counts down from the time it was last retrieved from the master. I don't think PowerDNS has a mechanism to override that. However, it is there for a reason. Yes, and that value is the value that a well behaved DNS client should use to schedule its next DNS query for that host. Cheers, Ken ___ Pdns-users mailing list Pdns-users@mailman.powerdns.com http://mailman.powerdns.com/mailman/listinfo/pdns-users
Re: [Pdns-users] pdns and default-ttl option
On 11/4/10 1:32 PM, Dmitriy Lyfar wrote: Thank you. Is there any way to control TTL for resource records in recursor? Sometimes I see: ggg.com http://ggg.com.428271INA212.72.60.198 Where recursor obtains this TTL value? As I said, it gets it from the authoritative server, then counts down over time until it reaches the time where the record is no longer good, and it throws it away. I did a quick query for 'ggg.com', and the authoritative servers for it provide a TTL of 432000 seconds, so a little math shows that the recursor you queried last retrieved that record slightly over 1 hour prior. There's not a way in pdns_recursor to override what's sent out as the record TTL, but as Kenneth pointed out, there's a good reason for clients to be able to see that, so trying to override it is probably not a good idea in the long run. -- Derrik Pates de...@devrandom.net ___ Pdns-users mailing list Pdns-users@mailman.powerdns.com http://mailman.powerdns.com/mailman/listinfo/pdns-users
Re: [Pdns-users] pdns and default-ttl option
On 11/4/10 2:30 PM, abang wrote: See http://doc.powerdns.com/built-in-recursor.html max-cache-ttl Maximum number of seconds to cache an item in the DNS cache, no matter what the original TTL specified. Available since 3.2. But that won't fix the TTL value to always be that specific value in returned records, which is what the OP wants. -- Derrik Pates de...@devrandom.net ___ Pdns-users mailing list Pdns-users@mailman.powerdns.com http://mailman.powerdns.com/mailman/listinfo/pdns-users
Re: [Pdns-users] pdns and default-ttl option
On Thu, Nov 04, 2010 at 02:53:00PM -0600, Derrik Pates wrote: On 11/4/10 2:30 PM, abang wrote: See http://doc.powerdns.com/built-in-recursor.html max-cache-ttl Maximum number of seconds to cache an item in the DNS cache, no matter what the original TTL specified. Available since 3.2. But that won't fix the TTL value to always be that specific value in returned records, which is what the OP wants. You should be able to do that will a lua script in version 3.3 with the no-cache directive and set the TTL for the packet manually. I have not tested it personally, but that sounds like it would work. Cheers, Ken ___ Pdns-users mailing list Pdns-users@mailman.powerdns.com http://mailman.powerdns.com/mailman/listinfo/pdns-users
