If all of the above is as expected (specifically the capabilities and run-time options of the target system Dropbear ssh server) you should then be able to do something like one of: ssh -L10443:127.0.0.1:443 dropbearhost (If the binaries were renamed you can confirm their identity with the -V option.)įinally, for Dropbear server it must be started without the -j or -k options to allow it to observe client requests for local and remote forwarding respectively. With Dropbear client you should run dbclient -h (or ssh -h), the presence of the -L and/or -R indicate DROPBEAR_CLI_LOCALTCPFWD and DROPBEAR_CLI_REMOTETCPFWD respectively were set at build time. With Dropbear server you should be able to run dropbear -h or ( sshd -h if it has been renamed), the presence of the -j and/or -k options indicate DROPBEAR_SVR_LOCALTCPFWD and DROPBEAR_SVR_REMOTETCPFWD respectively were set at build time. Usefully, these options control both the feature itself, and whether the feature is documented in the -h help output-if the relevant options are omitted from the help output then they were omitted from the build. AFAICT every public release since 2003 has had some form of TCP forwarding support (but not necessarily enabled when it was built). These are all set by default in the official (current dropbear-2022.82) source. At build time Dropbear has 4 distinct settings for this #define DROPBEAR_CLI_LOCALTCPFWD 1 Port-forwarding requires the ssh client and ssh server to interoperate, and of course for the feature to be present and allowed in both.
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