maybe I'm wrong but I did not find any related man pages that mention the subject
Index: pkg_add.1 =================================================================== RCS file: /cvs/src/usr.sbin/pkg_add/pkg_add.1,v retrieving revision 1.67 diff -u -r1.67 pkg_add.1 --- pkg_add.1 20 Jun 2007 15:41:36 -0000 1.67 +++ pkg_add.1 5 Nov 2007 12:14:21 -0000 @@ -558,6 +558,8 @@ .Xr ftp 1 . Must point to a command that understands .Li ${FETCH_CMD} -o - url . +.It Ev FTP_KEEPALIVE +If set to a duration in seconds ftp will try to ensure that an inactive connection will not dropped. .It Ev PKG_DBDIR Where to register packages instead of .Pa /var/db/pkg . -- see ya, giovanni