Community discussions

MUM Europe 2020
 
User avatar
sjwrick
Frequent Visitor
Frequent Visitor
Topic Author
Posts: 77
Joined: Tue Jul 25, 2006 10:12 pm

DNS not passing through to third party router

Thu Jun 02, 2016 10:30 pm

Running ROS 6.35.2

RB 2011UiAS (though have seen issue on other routers)

Customer connects and is able to ping out and open some websites. Other sites (which are almost always predictable across the client base i.e.: crucial.com, eyeonwater.com, msn.com, download apple app store items) DNS times out in getting information.

Take a Netgear router. Pings, routes out, just does not connect to these websites. Same with Dlink and Apple router. Other websites are just fine.

IF I hardcode the DNS to external DNS into the computer, iPad, Android things WORK - I can get to all sites.
IF I put in a Mikrotik (750,951,941,...) router with DHCP network assignment to tell DHCP-clients to use external DNS servers things WORK.

Solution of hardcoding external DNS or Mikrotik replacement with external DNS in Network assignment works everytime.

PROBLEM does not effect every client on network. Only some. Have many clients with third party rulers working just fine.

Comments? Solution with without the intervention? Why does DNS not passthrough third party router to client network devices? Why, when using the client router as the DNS proxy(?), not work??

Problem seemed to be introduced into 6.34 and continues ....
 
samsung172
Forum Guru
Forum Guru
Posts: 1186
Joined: Sat Apr 04, 2009 3:45 am
Location: Østfold - Norway
Contact:

Re: DNS not passing through to third party router

Fri Jun 03, 2016 1:19 am

Try to change the dns to 8.8.8.8
 
zmckenzie
just joined
Posts: 8
Joined: Wed May 30, 2007 12:53 am

Re: DNS not passing through to third party router

Fri Jun 03, 2016 2:07 am

Sounds like you may not have the RB2011 setup to handle DNS requests.

Go to IP/DNS, make sure there is a check mark for 'Allow Remote Requests'. Also, make sure there is at least one DNS server listed above ie. 8.8.8.8, etc.
Ryan McKenzie
MTCNA, MTCWE Certified Trainer
 
User avatar
sjwrick
Frequent Visitor
Frequent Visitor
Topic Author
Posts: 77
Joined: Tue Jul 25, 2006 10:12 pm

Re: DNS not passing through to third party router

Fri Jun 03, 2016 8:13 am

Core router is set this way

/ip dns print
servers: 8.8.8.8,8.8.4.4
dynamic-servers:
allow-remote-requests: yes
max-udp-packet-size: 4096
query-server-timeout: 2s
query-total-timeout: 10s
cache-size: 2048KiB
cache-max-ttl: 1w
cache-used: 1972KiB

I was told that Google DNS can be flaky so I can use an Internal DNS server if that is called for.
 
User avatar
ZeroByte
Forum Guru
Forum Guru
Posts: 4051
Joined: Wed May 11, 2011 6:08 pm

Re: DNS not passing through to third party router

Sat Jun 04, 2016 3:40 am

Probably your firewall rules are blocking the queries/replies.
When given a spoon,
you should not cling to your fork.
The soup will get cold.

Who is online

Users browsing this forum: Bing [Bot], Google [Bot], SandroVendramin and 181 guests