DNS problems....

RouterOS General
1

hai friends,

i am using v5.8 and i have an avarage of 100 customers.out of these 100 customers 95 customers getting DNS errors like they didn’t get yahoo properly.after update DNS ip it is particaly rectified.

Can any one assist me in solving this parmently.

I am using my own DNS(i.e., 202.62.64.3) and free DNS(i.e.,208.67.222.222)

why i am geting these issues please help me.

2

Try using 208.67.222.222 by itself without your own.

3

After I set max udp packet size to 8192 some errors went away. I increased cache size to 8192Kib and decreased TTL to 6 hours as well.

Then Yahoo, Windows Update & et all stopped creating frequent problems.

But works “better” if you can also disable DNS service on Windows PCs (XP, Vista & Seven).

Regards;

4

hai can you assist in brief.

5

Yep!

6

To change this values open terminal inside Winbox and navigate to ip > dns

then type:

set max-udp-packet-size=8192

set cache-size=8192Kib

set cache-max-ttl=6h

And that’s it.

Regards;

7

Thanks for your responce.

when i set these values to mikrotik can i disable DNS in system as well as in mikrotik

8

No!

Keep accept remote requets = yes to allow custommers to query MT abt DNS.

If MT customers interface IP is 10.0.0.1 … then at each customer the default gw & dns could be 10.0.0.1 as well. Normally this is dictated by MT DHCP (where you must have network definitions that reflects the parameters you are using, like network, dns ip adress, gateway, ntp server if any, etc).

Regards;

9

One of my routers:

[mramos@CORE] > ip
[mramos@CORE] /ip> dns
[mramos@CORE] /ip dns> pr
servers: 8.8.8.8,208.67.222.222,200.30.0.97
allow-remote-requests: yes
max-udp-packet-size: 8192
cache-size: 8192KiB
cache-max-ttl: 6h
cache-used: 718KiB
[mramos@CORE] /ip dns>