Type Old pfSense New pfSense Config syntax (as described by new pfSense)
none Disable Compression, retain compression packet framing [compress]
lz4 LZ4 Compression [compress lz4]
lz4-v2 LZ4 Compression v2 [compress lz4-v2]
lzo LZO Compression [compress lzo, equivalent to comp-lzo yes for compatibility]
stub Enable Compression (stub) [compress stub]
stub-v2 Enable Compression (stub v2) [compress stub-v2]
(blank) No Preference Omit Preference (Use OpenVPN Default)
noadapt Omit Preference, + Disable Adaptive LZO Compression [Legacy style, comp-noadapt]
adaptive Enabled with Adaptive Compression Adaptive LZO Compression [Legacy style, comp-lzo adaptive]
yes Enabled without Adaptive Compression LZO Compression [Legacy style, comp-lzo yes]
no Disabled - No Compression No LZO Compression