Oracle® Solaris 11.2 Tunable Parameters Reference Manual

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Updated: December 2014
 
 

IP Tunable Parameters With Additional Cautions

Changing the following parameters is not recommended.

_pathmtu_interval

Description

Specifies the interval in milliseconds at which IP flushes the path maximum transfer unit (PMTU) discovery information, and tries to rediscover PMTU.

Refer to RFC 1191 on PMTU discovery.

Default

1,200 milliseconds (20 minutes)

Range

2-999,999,999

Dynamic?

Yes

When to Change

Do not change this value.

Commitment Level

Unstable

_icmp_return_data_bytes (ipv4 or ipv6)

Description

When IPv4 or IPv6 sends an ICMPv4 or ICMPv6 error message, it includes the IP header of the packet that caused the error message. This parameter controls how many extra bytes of the packet beyond the IPv4 or IPv6 header are included in the ICMPv4 or ICMPv6 error message.

Default

64 for IPv4

1,280 for IPv6

Range

8-65,536 for IPv4

8-1,280 for IPv6

Dynamic?

Yes

When to Change

Do not change the value. Including more information in an ICMP error message might help in diagnosing network problems. If this feature is needed, increase the value.

Commitment Level

Unstable