HP-UX 11i June 2001 Release Notes

Internet and Networking Services
Network Transport (new at 11i original release)
Chapter 10204
Min((tcp_cwnd_init * MSS), max(2 * MSS, 4380)),
where MSS is the maximum segment size for the underlying link.
Default 4: (TCP implements RFC 2414). Range: 1-4
7) ip_pmtu_strategy ‘2’ is not supported for 11i: A local system can no
longer send its expected Path Maximum Transmission Unit (PMTU)
value within an ICMP_ECHO request to a remote system or router. This
change prevents a type of Denial-of-Service attack.
Type ndd -h for an online description of tunable parameters and other
documentation.
Compatibility Issues
For the following commands,
ndd -get /dev/ip ip_tcp_status
ndd -get /dev/ip ip_udp_status
ndd -get /dev/ip ip_raw_status
ndd displays IP addresses using the IP version 6 (IPv6) format. When
ndd maps IP version 4 (IPv4) addresses to IPv6 addresses, ndd displays
the IPv4 addresses with the prefix “::ffff:”.
ndd displays the remainder of the IPv4 address in dotted-decimal
notation. This could cause scripts that are looking for a given output to
fail.
Performance
None of the features will degrade performance. Enabling socket caching
using tcp_conn_strategy could potentially increase performance by 10 to
20%.
netstat
netstat displays the statistics and configuration of the networking
kernel. There are two changes to netstat. One is to netstat -r and the
other to netstat -I.
netstat -r no longer updates the “Use” field. Therefore, netstat -r no
longer displays this field.