![]() # - down: the only sensible 'down' action is to release the DHCP lease (as a courtesy to the # - the solution is to spawn a little "helper" that waits until the lease is acquired, # but can't until we get the DHCP lease we won't get the lease until we this script exits # - thus we have a chicken-and-egg situation: we need to manually fixup the DNS config, # macOS 10.4.7 the DHCP-acquired DNS information is not "merged" into the System # to make the interface functional, all by itself - *except* for one small thing: as of ![]() # - that's not directly a problem as the macOS DHCP client should do everything we need # - this means the DHCP acquisition can't complete until after this script exits # until *after* this script returns this makes sense: this script could fail in which # packets are queued up on the interface (and not actually sent over the openvpn tunnel) # - on testing w/ openvpn 2.0.5, and tcpdump on the tap interface as soon as it comes up, # to the server is available for use (ditto 'up-delay' at least for UDP) # - up: openvpn calls the 'up' script after the tun/tap interface is created, but before the link # incorporate the DHCP-supplied DNS configuration ![]() # - uses ipconfig to acquire a DHCP lease via the OpenVPN tap interface, and scutil to # A script to be used as an OpenVPN bridged (tap) up/down script on Mac OSX 10.4 # Use in your OpenVPN config file as follows: # - this script extracts any such options and merges them into the current DNS config # - the server may also have pushed routes, and "DHCP"-like information (DNS Domain and server) # - OpenVPN will have assigned peer address as part of the tun establishment # A script to be used as an OpenVPN routed (tun) up/down script on Mac OSX 10.4 # Incorporating option processing from standard tunnelblick scripts # Splitting the result into separate up and down scripts # Merging Ben Low's openvpn-tun-up-down.sh and openvpn-tap-up-down.sh scripts These are provisioned automatically.# - must be bash: uses bash-specific tricks Unlike on Windows platform however, you do not need to worry about adding multiple virtual network adapters. You have to be careful not to implement conflicting routes and subnets when connecting to multiple OpenVPN servers at the same time. This program does support connecting to multiple OpenVPN servers at the same time, but there is a catch. Server-locked profiles are not supported, as mentioned earlier. The tray menu in the system tray will then show you options to use this connection profile – to start or stop the connection. You can for example download a user-locked or an auto-login profile from the OpenVPN Access Server web interface, and drag and drop it on the Tunnelblick icon. This program supports drag and drop to place OpenVPN connection profiles into Tunnelblick. This is accomplished on the Connect Client with a universal server-locked profile which is not supported by the OpenVPN GUI program. On the other hand, it does miss some features that Connect Client does have as well like Python support for post-auth scripting and other functions that integrate Connect Client with Access Server, like the ability to import connection profiles directly from an Access Server, or the ability to authenticate any valid user on your Access Server and have them connect without having to install a connection profile for each separate user account. It is called Tunnelblick and it is less limited in functionality than the OpenVPN Connect Client because it does support the option to connect to multiple OpenVPN servers at the same time. The open source project has a client for the macOS operating system as well. I find the feature comparison from the OpenVPN website quite helpful: Alternative: OpenVPN open source Tunnelblick program
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