cancel
Showing results for 
Search instead for 
Did you mean: 
Create a Post
Maik
Silver

Different DNS server per VS

Hello guys,

I'm pretty new when it Comes to VSX deployments and the related VS configuration. I have a quite Basic setup with one VSX cluster consisting out of two physical devices. On top of the VSX cluster we have two VS running (VS #1 and #2). Each VS has two dedicated interfaces. So currently there is not virtual switch or router in place, as there was no need for VS-to-VS communication or shared interfaces.

Now to my issue:

Basically I just want each VS to use a different DNS server, as per default the DNS config (as well as some other GAiA paramaters) are getting synched from VS0. The issue is, that once a change in clish of VS2 is made (regarding DNS) this is also getting synched to all the other VS (including VS0). So basically I assume that there is not way to have a different dns server entries for each VS...? I found a SK that mentions this problem and offers a solution - but this is only related for the remote access vpn blade and can't be used by any other feature. Without the possibility of configuring one or multiple different dns Servers for each VS I do not see a way to get any updates or the proxy feature working, as the gateway itself needs to send dns queries here.

It is also not wanted to have a shared dns in this environment as each VS should work completely independent from the other. So even if I adjust the routing so that VS2 can reach the DNS of VS0 no solution is met.

I read the VSX admin guide and could not find any word regarding this issue - so it could be the case that I overlooked something. Hopefully someone can point me in the right direction. 🙂

Regards,

Maik

5 Replies
Wolfgang
Silver

Re: Different DNS server per VS

Maik,

the system is working as expected, by design the DNS configuration is shared beetween all VSs, see DNS configuration of a single VS affects all other VSs too

You can change the DNS-server for the MOB-blade only following All Virtual Systems on VSX Gateway / VSX cluster with enabled Mobile Access blade are trying to reac...

Wolfgang

Maik
Silver

Re: Different DNS server per VS

Hello Wolfgang,

 

Thanks for your reply. Yes, I my guess was that it works by design like I described.

I am just wondering if there is any way to do it differently? I mean, why should I keep everything seperate from each VS but not the DNS settings (to mention one example, which is related to this thread). Does this mean that I need to specify several DNS servers so that all are getting synched while only one is applicable per vs? I have the requirement to separate DNS strictly - thus not allowing VS2 to access the same DNS as VS1 or VS0.

 

The only "solution" I can think of is specifying three dns servers, that are getting synched to all VS in my Environment:

- Primary [for VS0]

- secondary [for VS1]

- tertiary [for VS2]

But this would lead to failing DNS requests each time VS1 or VS2 try to do a name resolution… so this is not really a solution but just a very dirty Workaround (that would also eliminate redunancy per VS dns, as I would have only one dns Server per vs).

Wolfgang
Silver

Re: Different DNS server per VS

Maik,

I understand your problem and you are not alone. But it is how it works.

If you have requirements  to separate the DNS, then VSX maybee is not a solution or you have to accept the limitation.

Maybe some of the other VSX guys here has an idea or maybe with R80.30 is something new ?

Wolfgang

Maik
Silver

Re: Different DNS server per VS

*push*

Some words from the community would be great - maybe someone already had this issue in the past and solved it via some way?

0 Kudos
Highlighted
Employee+
Employee+

Re: Different DNS server per VS

NAT or BIND Views might help as work arounds.

0 Kudos