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TRAMP file name syntax can accommodate ad hoc specification of
multiple proxies without using tramp-default-proxies-alist
configuration setup(see Multi-hops).
Each proxy is specified using the same syntax as the remote host specification minus the file name part. Each hop is separated by a ‘|’. Chain the proxies from the starting host to the destination remote host name and file name. For example, hopping over a single proxy ‘bird@bastion’ to a remote file on ‘you@remotehost’:
C-x C-f /ssh:bird@bastion|ssh:you@remotehost:/path
Proxies can take patterns %h or %u.
TRAMP adds the ad-hoc definitions on the fly to
tramp-default-proxies-alist and is available for re-use during
that Emacs session. Subsequent TRAMP connections
to the same remote host can then use the shortcut form:
‘/ssh:you@remotehost:/path’.
For ad-hoc definitions to be saved automatically in tramp-default-proxies-alist for future Emacs sessions, set tramp-save-ad-hoc-proxies.
(setq tramp-save-ad-hoc-proxies t)