IP Variables
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ip_addrs_per_if
limit on IP addresses per interface
The Number of multiple logical interfaces that can be associated with a physical network interface. (le0:0, le0:2 ... , le0:255,).
2.5.1 and 2.6 Default value = 256
ip_enable_group_ifs
2.6 parameter that enables ip load balancing over physical interfaces.
see ifconfig 2.6 man page INTERFACE GROUPS
" rotate source address selection when the source address is unspecified,and in the case of multiple physical interfaces in the same group, to scatter traffic across different IP addresses on a per-IP-destination basis. Default value is 0 (Default =1 before patch 105786-05)
ip_forwarding
Determines if the workstation will route packets.
( forward packets between interfaces) This variable can be one of three selections:
0 Never forward
1 Always forward
2 Only forward when two or more interfaces are up
The default value is 2 on 2.4, 2.5 and 2.5.1 systems.
if_forwarding value of 2 was removed in Solaris 2.6 /* RFC1122 Conformance */ see /etc/rc2.d/S69inet
ip_forward_src_routed
Determines whether to forward packets that are source routed, (packets which have a specific machine listed as part of route.
setting to 0 prevents a router from generating source routed packets, or from participating as a source router.
The default value is 1
ip_ire_status
List current IREs (Internet Routing Entries).
This is the cache of addresses ip is actually using .
similar output version of " netstat -rvan " used for debugging ( Read Only )
ip_ire_cleanup_interval
how long to keep a route that is not being used.
This is the length of time that a specific route is allowed to exist without being used.
The default is 30000 ms (30 seconds).
ip_ire_flush_interval
maxmimum length a specific route may be kept, even if it is being used.
This is the period after which all specific routes are thrown away.
The default is 1200000 ms (20 minutes).
ip_path_mtu_discovery
Determines whether to use the Path MTU Discovery algorithms, in order to prevent excessive packet fragmentation. The default value is 1 (True).
see RFC 1191
Note: using FDDI , TR , ATM , on Solaris between networks with different MTU sizes, you may need to off ip path mtu discovery to enable fragmentation, if implementing
routers that do not support RFC 1191.
ex:# /usr/sbin/ndd -set /dev/ip ip_path_mtu_discovery 0
ip_send_redirects
Determines whether the host should send ICMP redirects when it routes packets. The default value is 1 (True).
ip_strict_dst_multihoming
Determines whether to use Strict Destination Multihoming. If this variable is set to True, and ip_forwarding is turned off, then the machine will not
except packets destined for a different interface. see RFC1122
The default value is 0
