8256 to 512
9512 or greater
TCP window size recommendations
Table 17 through Table 23 provide TCP window scaling factor and window size settings for specific
WAN environments. These tables are organized by typical link speed.
NOTE:
The TCP window size recommendations listed in Table 17 through Table 23 are based on low-loss
networks (0.0012% average packet-loss ratio over 24 hours). For higher-loss, longer-latency networks,
you should reduce the recommended window size and scaling factor by one setting to compensate
for the increased number of packet retransmissions.
Table 17 T1/DS-1 1.554 Mb/Sec (Bandwidth = 1 Mb)
Compression recommend-
ation
Scaling factor (2
n
)
Window size (bytes)
Round trip time (RTT) in
ms
Yes164K250
Yes032K100
Yes032K50
Yes032K25
Yes032K20
Yes032K15
Yes032K10
Yes032K5
Yes032K2.5
Yes032K1 or less
Table 18 T3/DS-3 45 Mb/Sec (Bandwidth = 43 Mb)
Compression recommend-
ation
Scaling factor (2
n
)
Window size (bytes)
Round trip time (RTT) in
ms
Yes51M250
Yes4512K100
Yes3256K50
Yes2128K25
Yes2128K20
MPX200 FCIP130
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