CIFS vs NETBIOS & network performance

32960 pts.
Tags:
CIFS
LAN
NetBIOS
Network performance
WAN
Windows Server 2008
Testing file open performance across a WAN vs LAN. I open a 1MB .rtf file. When opening on the LAN, the traffic is on port 445 (CIFS). When opening the same file from the same server across the WAN, the traffic is on port 139 (NETBIOS). My question for all of you protocol gurus: Is there really any difference in the traffic when using a different port to do the same activity? If so, what are those differences & how does it contribute to end-user experience? Some other information you might be interested in: Number of packets LAN – 1,544 WAN – 1,864 Size of data packets LAN – 1,474 bytes WAN – 1,354 bytes Time to open (first packet to last packet) LAN – 3 secs WAN – 19 secs

Software/Hardware used:
Windows XP, Windows Server 2008

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