User`s guide

XStack Storage User’s Guide 107
3. Complete the fields in the dialog box:
– Max Segment Size. This option indicates the maximum size TCP segment that can be
accepted on a TCP/IP connection when the connection is established.
– Window Scale. This option lets you use large windows during TCP/IP connections. On
fast, high-bandwidth networks, a large TCP window provides greater efficiency by
allowing for a greater amount of unacknowledged data.
– TCP Timestamp Enabled. This option causes the receiving computer to send a time-
stamp reply back to the originating computer. Systems can use time-stamp requests and
replies to measure the transmission speed of datagrams on a network.
– Time to Live (TTL). This option specifies the default time to live (TTL) value for IP
packets generated by the Windows TCP/IP stack.
– PMTU Enabled. Enabling this option allows the XStack Storage to automatically adapt its
packet size. Disabling this option makes the system keep its default packet size (576
bytes), even when it receives an ICMP request asking it to change its packet size.
Disabling this option can render some remote systems unreachable, because if
intermediate systems on the path to the remote system cannot support the default
packet size, the XStack Storage will ignore their requests to make the packets smaller.
– Upper Layer Counter Reset. This option resets the TCP/IP upper layer counters.
Resetting the counters simplifies the ability to look at the counters for an accurate
percentage of packets sent or received.
4. Click OK.