I'm sure I'm bringing up a topic that's been brought up before, but I figured I'd have a go. Anyone from Google around that could answer to why there is no reverse DNS/PTR with most Google IP addresses (from traceroute, etc)? Alternatively, is there a server that can be utilized by the net operators community to at least get an answer on some of the IPs? It's very frustrating to contend with no PTR records in traces for troubleshooting and the like. Any information (off list or on) would be greatly appreciated. Thanks, Blair Trosper Updraft Networks & North Texas GigaPOP
On 10/26/2012 7:13 PM, Blair Trosper wrote:
I'm sure I'm bringing up a topic that's been brought up before, but I figured I'd have a go.
Anyone from Google around that could answer to why there is no reverse DNS/PTR with most Google IP addresses (from traceroute, etc)?
Alternatively, is there a server that can be utilized by the net operators community to at least get an answer on some of the IPs?
It's very frustrating to contend with no PTR records in traces for troubleshooting and the like.
Any information (off list or on) would be greatly appreciated.
Thanks, Blair Trosper Updraft Networks & North Texas GigaPOP Which particular address are you referring to? I get PTR responses for the limited set of address I get from google.
such as den03s06-in-x14.1e100.net [2607:f8b0:400f:801::1014]
On Fri, Oct 26, 2012 at 11:52 PM, nanog <nanog@afxr.net> wrote:
On 10/26/2012 7:13 PM, Blair Trosper wrote:
I'm sure I'm bringing up a topic that's been brought up before, but I figured I'd have a go.
Anyone from Google around that could answer to why there is no reverse DNS/PTR with most Google IP addresses (from traceroute, etc)?
Alternatively, is there a server that can be utilized by the net operators community to at least get an answer on some of the IPs?
It's very frustrating to contend with no PTR records in traces for troubleshooting and the like.
Any information (off list or on) would be greatly appreciated.
Thanks, Blair Trosper Updraft Networks & North Texas GigaPOP
Which particular address are you referring to? I get PTR responses for the limited set of address I get from google.
examples are good... I suspect he means things inside 15169's network that are not serving external people services: 209.85.243.114 for instance?
Hi Blair I guess that's pretty much because they don't really wish to put any info related to routers in public including location & circuit bandwidth which is often given major networks in PTR. Btw I guess you must be troubleshooting some routing issue. My experience has been decent with them in past. They are usually responsive on the email addresses mentioned in peering db for AS15169. http://www.peeringdb.com/view.php?asn=15169 On Sat, Oct 27, 2012 at 12:18 PM, Christopher Morrow < morrowc.lists@gmail.com> wrote:
On Fri, Oct 26, 2012 at 11:52 PM, nanog <nanog@afxr.net> wrote:
On 10/26/2012 7:13 PM, Blair Trosper wrote:
I'm sure I'm bringing up a topic that's been brought up before, but I figured I'd have a go.
Anyone from Google around that could answer to why there is no reverse DNS/PTR with most Google IP addresses (from traceroute, etc)?
Alternatively, is there a server that can be utilized by the net
operators
community to at least get an answer on some of the IPs?
It's very frustrating to contend with no PTR records in traces for troubleshooting and the like.
Any information (off list or on) would be greatly appreciated.
Thanks, Blair Trosper Updraft Networks & North Texas GigaPOP
Which particular address are you referring to? I get PTR responses for the limited set of address I get from google.
examples are good... I suspect he means things inside 15169's network that are not serving external people services: 209.85.243.114
for instance?
-- Anurag Bhatia anuragbhatia.com Linkedin <http://in.linkedin.com/in/anuragbhatia21> | Twitter<https://twitter.com/anurag_bhatia>| Google+ <https://plus.google.com/118280168625121532854>
On Sat, Oct 27, 2012 at 7:05 AM, Anurag Bhatia <me@anuragbhatia.com> wrote:
Hi Blair
I guess that's pretty much because they don't really wish to put any info related to routers in public including location & circuit bandwidth which is often given major networks in PTR.
more over, what help is it? I'm of two minds really about this: 1) it's handy to say: the router in elbonia is being 'bad' 2) it's just as simple to say: 'your router with interface ip 1.2.3.4 is being bad' (or: "everything through 1.2.3.4 is forked... plstofixkthxbi!") It's often cited as a headache to maintain the PTRs (not really, automation ftw!) I think really it gets down to "how does it really help?"
Btw I guess you must be troubleshooting some routing issue. My experience has been decent with them in past. They are usually responsive on the email addresses mentioned in peering db for AS15169.
also folk watch this list (and others)...though certainly the proper contact method is that which is in peeringdb.
http://www.peeringdb.com/view.php?asn=15169
On Sat, Oct 27, 2012 at 12:18 PM, Christopher Morrow <morrowc.lists@gmail.com> wrote:
On Fri, Oct 26, 2012 at 11:52 PM, nanog <nanog@afxr.net> wrote:
On 10/26/2012 7:13 PM, Blair Trosper wrote:
I'm sure I'm bringing up a topic that's been brought up before, but I figured I'd have a go.
Anyone from Google around that could answer to why there is no reverse DNS/PTR with most Google IP addresses (from traceroute, etc)?
Alternatively, is there a server that can be utilized by the net operators community to at least get an answer on some of the IPs?
It's very frustrating to contend with no PTR records in traces for troubleshooting and the like.
Any information (off list or on) would be greatly appreciated.
Thanks, Blair Trosper Updraft Networks & North Texas GigaPOP
Which particular address are you referring to? I get PTR responses for the limited set of address I get from google.
examples are good... I suspect he means things inside 15169's network that are not serving external people services: 209.85.243.114
for instance?
--
Anurag Bhatia anuragbhatia.com
Linkedin | Twitter | Google+
On Sat, Oct 27, 2012 at 5:01 PM, Randy Bush <randy@psg.com> wrote:
It's often cited as a headache to maintain the PTRs (not really, automation ftw!) I think really it gets down to "how does it really help?"
why is my traffic between seattle and new york going through tokyo?
'because someone forgot to rename the ptr' ?
On 28/10/2012 01:47, Christopher Morrow wrote:
On Sat, Oct 27, 2012 at 5:01 PM, Randy Bush <randy@psg.com> wrote:
It's often cited as a headache to maintain the PTRs (not really, automation ftw!) I think really it gets down to "how does it really help?"
why is my traffic between seattle and new york going through tokyo?
'because someone forgot to rename the ptr' ?
'because it's the mid-2000s and I'm using ipv6?'
On Oct 27, 2012, at 11:28 , Christopher Morrow <morrowc.lists@gmail.com> wrote:
On Sat, Oct 27, 2012 at 7:05 AM, Anurag Bhatia <me@anuragbhatia.com> wrote:
Hi Blair
I guess that's pretty much because they don't really wish to put any info related to routers in public including location & circuit bandwidth which is often given major networks in PTR.
more over, what help is it? I'm of two minds really about this: 1) it's handy to say: the router in elbonia is being 'bad' 2) it's just as simple to say: 'your router with interface ip 1.2.3.4 is being bad' (or: "everything through 1.2.3.4 is forked... plstofixkthxbi!")
True, but... It's handy to say foo-e1-kcks is hosed. Not as handy to say 2001:db8:5fe3:139a:6254:03ff:fe19:acf3 is hosed.
It's often cited as a headache to maintain the PTRs (not really, automation ftw!) I think really it gets down to "how does it really help?"
See above? Beyond that, it's also convenient if you're trying to correlate outages affecting more than just google. For example, if I'm getting complaints about access to google, yahoo, nymex, and edgar and traceroutes to all three of those show packet loss between routers in Dallas and routers in Atlanta, then I know I'm probably facing a fiber or carrier outage or partial outage along the Dallas to Atlanta path. I may be able to take independent action to reroute my traffic via a more northerly path to avoid that problem. Owen
participants (7)
-
Anurag Bhatia -
Blair Trosper -
Christopher Morrow -
nanog -
Nick Hilliard -
Owen DeLong -
Randy Bush