[Asterisk-Users] TFTP Secondary Ports

[Tzafrir Cohen]

On Tue, Aug 02, 2005 at 10:46:17PM -0700, Chad Brown wrote:
> I'm publishing tftp through my firewall to support external Cisco 7960
> sip phones. I know that the primary port is 69 for tftp. However, tftp
> also uses secondary ports ranging from 1,0XX to 30,XXX. ( A broad range)
> In an effort to limit the secondary ports that are opened, some Windows
> based tftp server such as the winagents product allows you to limit the
> range of secondary ports that are used allowing you to somewhat tighten
> firewall publishing rules.

The "secondary ports" are not determained by the server. Rather, they
are set by the client, IIRC. File transfers simply re-use the existing
socket that was used to connect in the first place.

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