If you NEED more than 1400 you can start to inch your way up, you can probably go to 1450 and sometimes to 1480'ish? If you need more than that then of course you need to split in to 2 packets, of which there are several obvious ways of doing. My work goes on a lot of different hardware / platforms / routers, and to be honest the place I start is 1400 bytes. I've done a lot of work writing network interfaces and using 65k is silly, and 1500 can also get you in to big trouble. There are a lot of "technically correct" answers such as 65k and 1500. For now, comment the lines out.This is an excellent question and I run in to this a lot at work actually. bash_profile on the server, remove anything that can echo. ssh server touch foo), but is mysteriously ignoredwhen using scp2/sftp.Ĭheck your. With file transfers, the umask setting isimportant, and people are confused when they find that the umask they setin their ~/.login file works with random remote commands(e.g. This prevents the corruption problem, butintroduces other difficulties. With most shells, -f causes the shell to omit thenormal startup file processing. SSH2 has a Boolean configuration statement AllowCshrcSourcingWithSubsystems, set false by default, whichcauses sshd2 to pass the -f flag to the shell whenrunning subsystem programs ( sftp-server is run as an SSH-2"subsystem"). I personally feelthat using the shell is the right thing to do: having startup files thatemit text messages when there is no user to read them is just amistake. Sftp-server directly,without the shell, would avoid this frequent problem. There has been a lot of argument about whether this is the right behavior,since having The common practice of setting an account's shell to /bin/false to disable it will prevent the owner from running anycommands, should authentication still accidentally succeed for somereason.The user's usual setup (command aliases, environment variables,umask, etc.) are in effect when remote commands are run.This is a Unixtradition, and has advantages: The reason the shell startup files are relevant at all, is that sshdemploys the user's shell when starting any programs on the user's behalf(using e.g. Suggesting a string beginning "Today." (or maybe "Thank-you" intransliterated Hebrew). The first four bytes of the text gets interpretedas a 32-bit packet length, which will usually be a wildly large number,provoking the error message above. If it does not make this test, it willinsert these text messages where they don't belong: in this case,polluting the protocol stream between scp2/sftp and sftp-server. login, etc.) which output text messages on login, intended to beread by humans (like fortune, echo "Hi there!", etc.).Such code should only produce output on interactive logins, when there isa tty attached to standard input. What often happens, though, is that there are statements in eitherthe system or per-user shell startup files on the server(. In order for this to work, the SSH session must be "clean" - that is,it must have on it only information transmitted by the programs at eitherend. The protocol is in factbased on the same packet protocol used by SSH. Scp2/sftp and sftp-server use a special file-transferprotocol, which they speak over this SSH session. Ssh server -s -oForwardX11=no -oForwardAgent=no -oProtocol=2 sftp Sftp server might result in the following command beingrun (OpenSSH): Sshin a subprocess, to connect to the remote host and run the file-transferserver (usually named
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