Performance of scp with OpenSSH - 5.1p1

Damien Miller djm at
Tue Aug 26 16:45:38 EST 2008

On Tue, 26 Aug 2008, S, Senthilprabu (NSN - IN/Bangalore) wrote:

> Hello Damien,
> Thanks a lot for the reply!!!
> > Did you enable UMAC 64?
> I did not do any specific setting wrt UMAC-64 explicitly when I used the
> scp command. But do read on net that some kind of configuration can be
> done in ssh/sshd config file. Is it true?

MAC algorithms, like ciphers, are selected at runtime. The following
command is an example, but there is no substitute for reading the 

> > scp -oCiphers=arcfour256 -oMACs=umac-64 at ...

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