[Samba] maximum amount of data in a SMB read response packet

Stijn Eeckhaut stijn.eeckhaut at intec.ugent.be
Tue Nov 15 14:24:08 GMT 2005


When sniffing traffic between a WinXP client (WinXP Professional version 
2002 SP1) and a Samba server (Samba 3.0.9-2.1.5-SUSE on Suse Linux 9 
kernel 2.6.5), I observed the following behavior:

- Writing to the Mapped network drive occurs with SMB write request 
packets containing exactly 64kB of data.

- Reading from the Mapped network drive occurs with SMB read requests 
for 60kB of data, followed each time by a SMB read request for 4kB of data.

The smb.conf file looks like this:
# Global parameters
    workgroup = WORKGROUP1
    server string = server1
    printcap name = /etc/printcap
    log level = 0
    security = user
    socket options = TCP_NODELAY SO_RCVBUF=262144 SO_SNDBUF=262144
    encrypt passwords = yes
    smb passwd file = /etc/samba/smbpasswd
    max xmit = 65535 (= the default and maximum value)
    read raw = yes
    write raw = yes
    large readwrite = yes
    comment = share1 on server1
    path = /shareddirectory1
    read only = no
    browseable = yes

Is there a way of filling a Samba read response packet with 64kB of 
data, like in the write request case? Or is the total size of a Samba 
read response packet limited to 'max xmit'?

Thanks in advance,
Stijn Eeckhaut

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