our one of the location having connectivity at Dubai end as below:
Internet Leased Line 1:1 8 Mbps -------> internet cisco router-->cisco ASA--->cisco L3 Switch----> users
Internet Broad Band shared 1:8 Link 100 Mbps------->internet Broad Band router-->cisco L3 Switch----> Microsoft Proxy Server
we have configured site to site VPN on ASA from this site to HO India Location. Dubai end users are accessing internet through proxy server via another internet broad band link. this internet broad band is in vlan 2 & ASA & all users are vlan 1. presently users are accessing the internet & it is working fine. network diagram is attached.
now recently we have migrate the emails system from in-house to O365 cloud. now I am observing that internet browsing is getting slow as well as emails are getting slow response. we observed that internet broad band link is fully over utilizing. we can not upgrade the bandwidth of broad band link as this is limitation at ISP end.
can we do like this----
1. when user access O365 mail then its traffic will go via proxy ---->ASA ---> via internet link 8 Mbps.
2. when user access internet then its traffic will go via proxy ---->ASA ---> internet broad band router ----> Internet Broad band shared link 100 Mbps.
so that email load will shift on 8 Mbps link & rest of the internet load will go via broad band link as earlier users are accessing.
Is it feasible, if yes, please guide us that how to do it.
What you would have to do is specify the IP range of your ESP as the destination in the ACL, rather than the protocols, with https as the protocol, if you just wanted secure web traffic routed via the connection.
I doubt that is the cause of the issue, that's more likely due to the E-mails themselves (especially outgoing if you have DSL), the solution for this has been detailed.