--On Monday, September 13, 2004 14:24 -0400 KEVIN ZEMBOWER <[EMAIL PROTECTED]> wrote:
I'm still trying to troubleshoot my problem getting Amanda to work though a firewall. I've read John Jackson's port usage document and the FAQ at http://amanda.sourceforge.net/fom-serve/cache/139.html. I'd like someone to comment on whether or not I have the overall communication sequence correct below. Then, I'd like information on how this is different if amcheck rather than amdump is run.
In compiling amanda, I used these options: "--with-portrange=10080,10083 --with-tcpportrange=10080,10083 --with-udpportrange=850,854".
This is what I understand concerning the sequence of port usage in making an amanda backup:
1. The tapehost makes a 'start backup' request of the client, originating on port 850-854 to port 10080-10083 using UDP. The contents of the packet contain a port number in the range 850-854 which is open on the tapehost, listening for TCP connections.
2. The client responds by sending a UDP packet from any (?) port to port 850-854 on the tapehost. [Q: Can ports 850-854 on the tapehost be open to receive both UDP and TCP packets at the same time?] The contents of the packet are port numbers in the range 10080-10083 on the client which are listening for TCP packets from the tapehost.
3. The tapehost responds by sending a packet from port 10080-10083 using TCP to port 10080-10083 on the client. This packet starts the transmission of the backup data from the client to the tapehost, using the same port numbers just used.
Thanks for reviewing this and letting me know whether I've got it right. I appreciate your patience and help.
-Kevin Zembower
----- E. Kevin Zembower Internet Systems Group manager Johns Hopkins University Bloomberg School of Public Health Center for Communications Programs 111 Market Place, Suite 310 Baltimore, MD 21202 410-659-6139
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