Well the traffic to the upstream, yes, but the DNS servers are in a
different port of the BMU.


Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373

On Fri, Jun 19, 2015 at 11:08 AM, Sam Tetherow <[email protected]> wrote:

> So not all traffic goes out through the mikrotik core?  Must have read the
> diagram wrong.
>
>
> On 06/19/2015 09:49 AM, Josh Luthman wrote:
>
>> That won't work in my situation.
>>
>> Josh Luthman
>> Office: 937-552-2340
>> Direct: 937-552-2343
>> 1100 Wayne St
>> Suite 1337
>> Troy, OH 45373
>> On Jun 19, 2015 10:48 AM, "Sam Tetherow" <[email protected]> wrote:
>>
>>  I wouldn't blanket rewrite everyone's DNS traffic, there are legitimate
>>> reasons to use external DNS servers.
>>>
>>> Yes you can rewrite the DNS traffic with a simple NAT rule
>>>
>>> /ip firewall nat add chain=dst-nat to-addresses=<new-dns-server>
>>> dst-ports=53 protocol=udp dst-address=<old-dns-server>
>>> /ip firewall nat add chain=dst-nat to-addresses=<new-dns-server>
>>> dst-ports=53 protocol=tcp dst-address=<old-dns-server>
>>> /ip firewall nat add chain=src-nat to-addresses=<old-dns-server>
>>> src-ports=53 protocol=udp src-address=<new-dns-server>
>>> /ip firewall nat add chain=src-nat to-addresses=<old-dns-server>
>>> src-ports=53 protocol=tcp src-address=<new-dns-server>
>>>
>>> I think I still have customers with routers that use my old AT&T DNS IPs
>>> from 9 years ago.
>>>
>>> On 06/19/2015 09:13 AM, Micah Miller wrote:
>>>
>>>  Why use the ip's from the old DNS servers at all?  Couldn't you simply
>>>> redirect all DNS traffic from your customers to your new DNS?
>>>>
>>>> Somthing like this possibly:
>>>> /ip firewall nat chain=dst-nat to-addresses=<new-dns-server>
>>>> to-ports=53 protocol=udp src-address=<customer-subnet> dst-port=53
>>>>
>>>> On Fri, Jun 19, 2015 at 8:55 AM, Josh Luthman
>>>> <[email protected]> wrote:
>>>>
>>>>  Here's my network from a high level:
>>>>>
>>>>> Customers -> Powercode BMU (router) -> Mikrotik Core -> Upstreams
>>>>>                        Powercode BMU (router) <- DNS servers
>>>>>
>>>>> Is it possible to redirect the traffic in this case?  I'm kind of
>>>>> thinking
>>>>> on paper here, but what if I took the IPs of the old DNS servers, put
>>>>> them
>>>>> on the MT core and then did a dstnat to the new IPs?
>>>>>
>>>>> The reasoning behind this is the public IPs of the old servers are TWC
>>>>> addresses and I am moving to my own ARIN (portable) IPs.
>>>>>
>>>>> Josh Luthman
>>>>> Office: 937-552-2340
>>>>> Direct: 937-552-2343
>>>>> 1100 Wayne St
>>>>> Suite 1337
>>>>> Troy, OH 45373
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>>>>>
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