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seen Jun 6 '13 at 5:36

Nov
10
awarded  Scholar
Nov
10
comment How to get public DNS server addresses?
Sorry for delay - accepted.
Nov
10
accepted How to get public DNS server addresses?
Jun
21
comment How to get public DNS server addresses?
Nevermind - got it. Was a matter of properly putting in the NS records with the registrar for the domain I'm using. Works well. Thanks again.
Jun
21
comment How to get public DNS server addresses?
200_success, can you mail me offline or reply here regarding your setup? Trying to replicate it. Yours was working fine and mostly returning what I expected....I implemented the code and it's returning only the public IPs of the networks i'm testing from (rather than dns servers like yours). Mail is jwm.forward@gmail.com
Jun
13
comment How to get public DNS server addresses?
thanks. it's definitely problematic and using an above example i've found that the source IPs that get identified are other dns servers on the same network (EG i hardcode 4.2.2.2 and get back a different dns server at verizon/level3). probably not possible to do what i'm after. really appreciate the feedback. i'll continue testing.
Jun
13
comment How to get public DNS server addresses?
thanks very much! by doing nslookups and setting the NS to resolverid.acrotect.com it appears to return the public dns server that forwarded the query. in multiple tests these differed from what was hardcoded on my routers. for instance 4.2.2.1 and 4.2.2.2 come back with different dns servers in verizon/level3 in my locale. similar results with some ec2 machines, amazon dns servers other than what i hardcoded were returned. if you can leave the server up for a few days, much appreciated. looks like indeed it won't be possible to do what i'm after.
Jun
13
comment How to get public DNS server addresses?
an agent yes, but those commands will often only yield me an internal address of a router, which is the problem. i want to know what servers my home router is using for external resolution - whether they are provided by the ISP or whether they are hard coded in by a user on the router. the problem is that all the results i get seem to leave these out. i know that often times people hard code on their machine which is fine but that's only part of the time.
Jun
13
comment How to get public DNS server addresses?
Thanks for the reply, but not an option - this type of data will need to be easily retrieved from client machines (mostly in fact on home networks using major ISPs with typical setups). The most typical use case would be a script running on a user's machine that can tell what DNS servers their ISP is providing...when their DHCP info points at their internal router address for dns. Ipconfig returns an internal address, dig and nslookup traces cite the internal router address, etc.
Jun
13
asked How to get public DNS server addresses?
Nov
4
comment Postfix :: redirect spam mail to different mx transport?
Thanks. I got it working using spampd (proxy daemon) and a postfix content filter. spampd acts as a before-queue filter and calls spamass. when finished it passes the mail back to postfix on a secondary listener and a header check is used. If there's a hit it uses a FILTER argument to send the mail somewhere else via smtp. Otherwise the mail goes out using the relay domain address specified in the transport map.
Nov
4
asked Postfix :: redirect spam mail to different mx transport?