Re: PTR records for IPv6

2013-09-03 Thread Florian Lohoff
Hi, On Mon, Sep 02, 2013 at 09:30:22AM +1200, Brian E Carpenter wrote: > So, is there any real operational value in this, or is it just > a case of "we did it for v4 so it must be right for v6"? Its a nice to have IMHO. Whats missing is an idea how to get forward and reverse DNS out to resident

Re: PTR records for IPv6

2013-09-03 Thread Mikael Abrahamsson
On Mon, 2 Sep 2013, Mohacsi Janos wrote: Yes, but we must not forget temporary addresses. If the MTA has temporary addresses, then it will prefer them for its smtp sessions. So, one should either disable temporaries on all MTAs or use DNS dynamic updates. I think that it would be much wiser to

Re: PTR records for IPv6

2013-09-03 Thread Bjørn Mork
Florian Lohoff writes: > On Mon, Sep 02, 2013 at 09:30:22AM +1200, Brian E Carpenter wrote: >> So, is there any real operational value in this, or is it just >> a case of "we did it for v4 so it must be right for v6"? > > Its a nice to have IMHO. > > Whats missing is an idea how to get forward an

Re: PTR records for IPv6

2013-09-03 Thread Mohacsi Janos
On Tue, 3 Sep 2013, Mikael Abrahamsson wrote: On Mon, 2 Sep 2013, Mohacsi Janos wrote: Yes, but we must not forget temporary addresses. If the MTA has temporary addresses, then it will prefer them for its smtp sessions. So, one should either disable temporaries on all MTAs or use DNS dynam

Re: PTR records for IPv6

2013-09-03 Thread Florian Lohoff
Hi, On Tue, Sep 03, 2013 at 01:06:56PM +0200, Bjørn Mork wrote: > I have played with the idea of implementing some sort of selv service > for the end users, allowing them to either have their prefix delegated > or to add a few simple *static* PTR records for specific addresses. I do > not see any

Re: PTR records for IPv6

2013-09-03 Thread Marco d'Itri
On Sep 03, Mikael Abrahamsson wrote: > Mostly because it's on by default. Even if you configure a static > address and default gw, as soon as the system sees RAs it might > start to use SLAAC based privacy addresses for outgoing connections. This is clearly a misconfiguration. -- ciao, Marco

Re: PTR records for IPv6

2013-09-03 Thread Marco Sommani
On 03/set/2013, at 14:38, m...@linux.it (Marco d'Itri) wrote: > On Sep 03, Mikael Abrahamsson wrote: > >> Mostly because it's on by default. Even if you configure a static >> address and default gw, as soon as the system sees RAs it might >> start to use SLAAC based privacy addresses for outgoi

Re: PTR records for IPv6

2013-09-03 Thread Frank Habicht
On 9/3/2013 3:46 PM, Marco Sommani wrote: > > On 03/set/2013, at 14:38, m...@linux.it (Marco d'Itri) wrote: > >> On Sep 03, Mikael Abrahamsson wrote: >> >>> Mostly because it's on by default. Even if you configure a static >>> address and default gw, as soon as the system sees RAs it might >>> s

Re: PTR records for IPv6

2013-09-03 Thread Nick Hilliard
On 03/09/2013 13:46, Marco Sommani wrote: > On 03/set/2013, at 14:38, m...@linux.it (Marco d'Itri) wrote: >> On Sep 03, Mikael Abrahamsson wrote: >> >>> Mostly because it's on by default. Even if you configure a static >>> address and default gw, as soon as the system sees RAs it might >>> start t

RE: PTR records for IPv6

2013-09-03 Thread Frank Bulk
If an ISP assigned a /64 to their mail server, they could assign each customer a permanent unique IP on their MTA, perhaps hash-generated. Every message could be traceable without the X-Authentication header. =) Frank -Original Message- From: ipv6-ops-bounces+frnkblk=iname@lists.clue