Summary
The ssh_config Match localnetwork criterion is not supported on Windows. It never matches, and with -v logs:
match localnetwork: not supported on this platform
Version
OpenSSH_for_Windows_10.0p2 (and earlier).
Cause
check_match_ifaddrs() in readconf.c is gated on HAVE_IFADDRS_H, which the Windows build (contrib/win32/openssh/config.h.vs) does not define, and contrib/win32/win32compat/ provides no getifaddrs(). So the #else branch ("not supported on this platform") is compiled in. The same gate disables the getifaddrs() path used by BindInterface in sshconnect.c.
Repro
ssh_config:
Match localnetwork 127.0.0.0/8
Compression yes
ssh -G -F <cfg> somehost -> compression stays no.
Fix
Implemented in PowerShell/openssh-portable#859: a getifaddrs()/freeifaddrs() shim over the Win32 GetAdaptersAddresses() API, HAVE_IFADDRS_H defined, build wiring, and a unit test. Built and verified on Windows x64 (also cross-compiles for ARM64).
Summary
The
ssh_configMatch localnetworkcriterion is not supported on Windows. It never matches, and with-vlogs:Version
OpenSSH_for_Windows_10.0p2(and earlier).Cause
check_match_ifaddrs()inreadconf.cis gated onHAVE_IFADDRS_H, which the Windows build (contrib/win32/openssh/config.h.vs) does not define, andcontrib/win32/win32compat/provides nogetifaddrs(). So the#elsebranch ("not supported on this platform") is compiled in. The same gate disables thegetifaddrs()path used byBindInterfaceinsshconnect.c.Repro
ssh_config:ssh -G -F <cfg> somehost->compressionstaysno.Fix
Implemented in PowerShell/openssh-portable#859: a
getifaddrs()/freeifaddrs()shim over the Win32GetAdaptersAddresses()API,HAVE_IFADDRS_Hdefined, build wiring, and a unit test. Built and verified on Windows x64 (also cross-compiles for ARM64).