[Mikrotik] rOS v6.1 and Router Outbound IP Address

Scott Reed sreed at nwwnet.net
Mon Jul 1 15:39:44 CDT 2013


The first thing it will look for is route cost/weight.
Then the IP addresses.  I am not sure what rules it uses for your issue, 
but for most things MT likes to start with the highest valued item.

On 7/1/2013 3:02 PM, Rory McCann wrote:
> On this particular router, my upstream assigned two IPs from different 
> subnets, so I technically have two default routes. One is just 
> disabled since the default gateways in question are assigned to the 
> same device. (I can communicate over each IP fine and everything was 
> working fine in 5.x).
>
> When referencing the terminal, I was under the understanding (per 
> Butch's explanation) that when you issue /ip address print, the first 
> publicly routable IP listed is the IP that the router will use for 
> communication. In my case, the IP I WANT the router to use comes 
> before the IP that it actually uses in the terminal listed of the IP 
> addresses, however upon reboot it uses the other IP.
>
> Rory McCann
> Minn-Kota Ag Products
> P: 701-403-4877 | E: rory at mkap.com
>
> On 7/1/2013 1:46 PM, Grand Avenue Broadband wrote:
>> Can you not utilize "pref-src" in the routing table to ensure the 
>> behavior you desire?
>>
>> I may not be understanding your question -- particularly, your 
>> mention of "the terminal" increases my doubt.
>>
>> On Jul 1, 2013, at 11:17 AM, Rory McCann <rmm.lists at gmail.com> wrote:
>>
>>> Has something changed recently in routerOS v6.x that involves how 
>>> the router chooses its IP address for outbound (router to internet 
>>> or router to router) connectivity?
>>>
>>> In the past, the router would always choose the first public IP 
>>> address listed in the terminal for its outbound communications. In 
>>> v6.1 (which I installed to utilize untagged VLAN support) I've 
>>> noticed that it appears to be choosing the lowest integer IP rather 
>>> than the first assigned.
>>>
>>> Eg: I have a router with 10.10.10.1 and 10.10.10.10 assigned to it. 
>>> 10.10.10.10 was the first one programmed and my "preferred" router 
>>> communication IP for IPSec, EoIP, etc.
>>>
>>> Upon reboot, the router starts talking on 10.10.10.1 instead of 
>>> 10.10.10.10. I have to remove and re-add the IP in order to change 
>>> this behavior. Upon reboot it again chooses 10.10.10.1.
>>>
>>> Are there some new firewall/NAT rules that affect this behavior or a 
>>> setting somewhere or is this some kind of obscure bug?
>>>
>>> -- 
>>> Rory McCann
>>> Minn-Kota Ag Products
>>> P: 701-403-4877 | E: rory at mkap.com
>>>
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>>> Visit http://blog.butchevans.com/ for tutorials related to Mikrotik 
>>> RouterOS
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>> RouterOS
>
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-- 
Scott Reed
Owner
NewWays Networking, LLC
Wireless Networking
Network Design, Installation and Administration

  

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