Date: Sat, 19 Feb 2000 19:05:27 -0700 (MST) From: Charles Mott <cmott@scientech.com> To: questions@FreeBSD.ORG Subject: Re: Redirecting/mapping ports to a local machine... help! Message-ID: <Pine.LNX.4.10.10002191856540.22579-100000@if.scientech.com> In-Reply-To: <20000219203204.G60348@cc942873-a.ewndsr1.nj.home.com>
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On Sat, 19 Feb 2000, Crist J. Clark wrote: > This is a server issue not a client issue. An ftp client can do > passive ftp from behind a NAT box. However, active ftp would not > work. This is not correct. There is specific code in the packet aliasing library used by natd for handling "active" (i.e. non-passive) connections. Essentially, the packet aliasing code looks for a PORT command in the control stream and then sets up a back-channel to wait for the port 20 control connection from the ftp server. Many people use ftp in non-passive mode from behind natd without any problems. > > Use of a control channel and a data channel is a basic part of the ftp > protocol. See RFC 959. Unimplemented RFC 2428 might be interesting too. > -- > Crist J. Clark cjclark@home.com > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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