Cisco has developed several clients that can be installed on end devices that deliver secure connectivity using VPN and other security technologies. The software that has been developed over the years includes:
1Password on Mac does not fill or save from applications that are not web browsers. It only saves and fills into web pages. You can of course use it to store all sorts of secure info, likely including the credentials for your VPN client, but you'd need to copy & paste the information out.
I just installed the AnyConnect client from my company in order to get the stuff I needed to make OpenConnect work, so I did go through the install and might be able to help you out. This was with 3.1.04063, so keep that in mind as I don't know what's different for 4.0. My company has a Windows cifs share with the anyconnect available clients, but they were in a .pkg format. I extracted them with 7-zip on Windows, then copying that folder to somewhere I could get at from Arch.
I used to sort of be able to use the actual anyconnect client, but only from my 32 bit chroot (I'm on x64). And then something seemed to go awry with /etc/resolv.conf or some other network settings, as the successful VPN connection in the chroot didn't seem to translate into my "actual" 64 bit environment and thus I couldn't do anything with the internet. Web pages just wouldn't load. Same with a 32 chroot installed browser, though, too... so I'm not sure what the issue was. I could ping, with ridiculously slow return times, but never do anything useful.
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