Tcp Window Size And Scaling Factor Recommendations - HP MPX200 User Manual

Then, convert the MWS to a recommended scale factor by dividing it by the default window size
(32,768 bytes). Use
Table 21 TCP window size scale factors
MWS scale result
0 to 2
2 to 4
4 to 8
8 to 16
16 to 32
32 to 64
64 to 128
128 to 256
256 to 512
512 or greater

TCP window size and scaling factor recommendations

Table 22 (page 124)
settings for specific WAN environments. These tables are organized by typical link speed.
NOTE: The TCP window size recommendations listed in
Table 28 (page 126)
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 22 T1/DS-1 1.554 Mb/sec (bandwidth = 1 Mb)
Round trip time (RTT) in ms
250
100
50
25
20
15
10
5
2.5
1 or less
Table 23 T3/DS-3 45 Mb/sec (bandwidth = 43 Mb)
Round trip time (RTT) in ms
250
100
50
124 MPX200 FCIP
Table 21 (page 124) to determine the scale factor.
through Table 28 (page 126)
are based on low-loss networks (0.0012% average packet-loss ratio over 24
Window size (bytes)
64K
32K
32K
32K
32K
32K
32K
32K
32K
32K
Window size (bytes)
1M
512K
256K
Scale factor / TCP Window size
0 / 32KB
1 / 64KB
2 / 128KB
3 / 256KB
4 / 512KB
5 / 1MB
6 / 2MB
7 / 4MB
8 / 8MB
9 / 16MB
provide TCP window size and scaling factor
Table 22 (page 124)
Scaling factor (2
1
0
0
0
0
0
0
0
0
0
Scaling factor (2
5
4
3
through
n
)
n
)