SOPHOS SSL VPN with different domains AD Controllers

Question

Hi; 
 We have a large server farm behind sophos firewall. There are different domain name AD servers available. I can authenticate users over ADs with these different domains. I can also use AD authentication on SSL VPN connections. No problem till this part. 
 Domain member computers connected with SSL VPN need to connect to sharing areas and RDH Farm areas defined by the domain name. 
 If I type one of the AD servers in the SSL VPN gloabal settings, including the IPV4 DNS address, for example (acb.local) users in the acb.local domain can access the domains inside with their domain name. 
 But there are 5 different domains used inside. But there are 5 different local domains used inside and we can define 2 IPV4 DNS addresses in SSL Global settings. 
 Is there a way to ensure that users in these 5 domains can query their DNS and operate easily in their own local domain names when they make SSL VPN?

Raphael Alganes · Answer

Hello there, 
 
 You might need to configure DNS request route for this use case: https://docs.sophos.com/nsg/sophos-firewall/19.5/Help/en-us/webhelp/onlinehelp/AdministratorHelp/Network/DNS/NetworkDNSRequestRouteAdd/index.html 
 If you want to resolve domain names through an alternate DNS server rather than forwarders or root servers, you can configure a DNS request route for that server. In this use case, your 5 local domains. So when client machines try to resolve their FQDNs, DNS request routes will route these to a DNS server that can resolve the request. 
 Hope this helps. Have a nice day and thank you for choosing Sophos 
 
 Cheers,