If I am running an IPSEC tunnel over an ADSL connection with bandwidth limits 2mbps down and 1mbps up is the bandwidth over the tunnel limited to 1mbps in both directions or is it also asynchronous?
Update: The answers so far haven't helped, so maybe I should give some more info of why I am asking the question.
Currently all of our resources are located at our data center, and clients in remote offices access these resources via IPSEC - each office has an ASA 5505 that has a VPN link to an ASA 5510 at the data centre. We use split tunnelling so that traffic not destined for the data center does not have to go over the IPSEC tunnel.
Many of our offices are on asynchronous connections (ADSL and VSAT for example) where the upload bandwidth is typically half the download bandwidth.
We are currently looking at the option of moving our file storage to a cloud provider, in which case the clients would access the files via HTTPS, rather than over the VPN.
One of the possible cases supporting the change would be a performance benefit. It has been suggested to me that users in asynchronously connected offices may potentially see a doubling of download speeds because traffic down an IPSEC tunnel in either direction is limited by the slowest direction. Is this true?