sys_attrs_ipv6(5) [osf1 man page]
sys_attrs_ipv6(5) File Formats Manual sys_attrs_ipv6(5) NAME
sys_attrs_ipv6 - ipv6 subsystem attributes DESCRIPTION
This reference page lists and describes attributes for the Internet Protocol Version 6 (ipv6) kernel subsystem. Refer to the sys_attrs(5) reference page for an introduction to the topic of kernel subsystem attributes. A value that enables (1) or disables (0) rate-limiting of ICMPv6 errors (see RFC 2463). Default value: 1 (enabled) The maximum time, in milliseconds, to wait before sending ICMPv6 error packets to a particular destination IPv6 address. Default value: 1000 (milliseconds) Minimum value: 1 Maximum value: LONG_MAX, or 9 quintillion The minimum time, in milliseconds, to wait before sending ICMPv6 error packets to a particular destination IPv6 address. Default value: 100 (milliseconds) Minimum value: 1 Maximum value: LONG_MAX, or 9 quintillion The number of packets to send before starting the ICMPv6 error packet rate-limiting timers. Default value: 10 (packets) Minimum value: 0 Maximum value: INT_MAX, or 2 billion A value that enables (1) or disables (0) a system's ability to forward IPv6 packets that are not addressed to the system. This functionality is usually enabled by using the /usr/sbin/ip6_setup command. Default value: 0 (disabled) For systems functioning as routers, both ipv6forwarding and ipv6router attributes must be 1. For IPv6 hosts that want to forward source routed packets, the ipv6forwarding attribute must be 1. A value that enables (1) or disables (0) a system's ability to forward IPV6 packets that are not addressed to the system. This functionality is usually enabled by using the /usr/sbin/ip6_setup command. When enabled, Neighbor Advertisements from the system have the IsRouter flag set (see RFC 2461). Default value: 0 (disabled) For systems functioning as routers, both ipv6forwarding and ipv6router attributes must be 1. SEE ALSO
sys_attrs(5) RFC 2461, Neighbor Discovery for IP Version 6 (IPv6), Narten, T., Nordmark, E., December 1998 RFC 2463, Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6), Conta, A., Deering, S., December 1998 sys_attrs_ipv6(5)
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sys_attrs_inet(5) File Formats Manual sys_attrs_inet(5) NAME
sys_attrs_inet - inet subsystem attributes DESCRIPTION
This reference page lists and describes attributes for the Internet (inet) kernel subsystem. Refer to the sys_attrs(5) reference page for an introduction to the topic of kernel subsystem attributes. The number of hash buckets in the kernel interface alias table (in_ifaddr). The value of the inifaddr_hsize attribute is always rounded down to the nearest power of 2. The maximum value is 512. Default value: 32 (hash buckets) Minimum value: 16 Maximum value: 512 The default Internet Protocol (IP) time-to-live value. Default value: DEFTTL, or 64 (router hops) Minimum value: 0 Maximum value: 255 A value that enables (1) or disables (0) a check to determine whether an IP datagram whose destination address is a directed broad- cast address has been received on the interface corresponding to that broadcast address. Default value: 0 (disabled) A value that enables (1) or disables (0) a system's ability to forward IP packets that are not addressed to the system. This func- tionality is usually enabled by using the /usr/sbin/iprsetup command. Default value: 0 (disabled) For systems functioning as routers, both ipforwarding and ipgateway attributes must be 1. Maximum time an IP fragment can spend waiting to be reassembled. Default value: IPFRAGTTL (60, in units of .5 seconds, or 30 seconds) Minimum value: 1 Maximum value: INT_MAX, or 2 billion A value that enables (1) or disables (0) a system's ability to forward IP packets that are not addressed to the system. This func- tionality is usually enabled by using the /usr/sbin/iprsetup command. Default value: 0 (disabled) For systems functioning as routers, both ipforwarding and ipgateway attributes must be 1. The number of times a system can simultaneously make outgoing connections to other systems. The number of outgoing ports is the value of the ipport_userreserved attribute minus the value of the ipport_userreserved_min attribute. The default value of the attribute is 5000; therefore, the default number of outgoing ports is 3976. Default value: 5000 Minimum value: 1 Maximum value: 65535 The lower limit of range of port numbers available for use by a TCP or UDP application. The number of outgoing ports is the value of the ipport_userreserved attribute minus the value of the ipport_userreserved_min attribute. The default value of the attribute is 5000; therefore, the default number of outgoing ports is 3976. Default value: 1024 Minimum value: 1 Maximum value: 65535 Maximum length of the IP input queue (ipintrq) before input packets are dropped. Default value: 1024 (bytes) Minimum value: 1024 Maximum value: 65535 Maximum number of IP input queues. Default value: 1 (queues) Minimum value: 1 Maximum value: 64 A value that enables (1) or disables (0) the sending of ICMP redirect messages. Default value: 1 (enabled) Enables (1) or disables (0) source routing. Default value: 1 (enabled) Time to wait after a decrease in a PMTU value before attempting to determine if the PMTU value has increased. Default value: PMTU_DECREASE_INTVL, or 1200 (in units of .5 seconds) Minimum value: 1 Maximum value: UINT_MAX, or 4 billion A value that enables (1) or disables (0) discovery of the path maximum transfer unit (PMTU). Default value: 1 (enabled) Time to wait after an increase in a PMTU value before attempting to determine if the PMTU has increased. Default value: PMTU_INCREASE_INTVL, or 240 (in units of .5 seconds) Minimum value: 1 Maximum value: UINT_MAX, or 4 billion The timer processing interval for routes participating in the PMTU discovery process. Default value: PMTU_RT_CHECK_INTVL, or 20 (in units of .5 seconds) Minimum value: 1 Maximum value: UINT_MAX, or 4 billion A value that enables (1) or disables (0), consideration of all IP addresses in the same network as being local. When this value is 1, all IP addresses that are in different subnets but in the same network are considered local. When this value is 0, only the IP addresses that match a directly connected subnet are considered local. Default value: 1 (enabled) The number of Transmission Control Protocol (TCP) hash tables. Default value: 1 (table) Minimum value: 1 Maximum value: 64 The number of buckets in the TCP inpcb hash table. Default value: 512 (buckets) Minimum value: 0 Maximum value: INT_MAX, or 2 billion Enables (1) or disables (0) optimization of the listen path for server sockets. Default value: 1 (enabled) A value that enables (1) or disables (0) 4.2 BSD-compatible behavior for the initial send sequence of numbers and keepalives. Default value: 1 (enabled) The number of initial segments to send during congestion window negotiation. Default value: 2 (segments) Minimum value: 1 Maximum value: UINT_MAX, or 4 billion A value that enables (0) or disables (1) window scaling. Default value: 0 (enabled) Note The values for disabling and enabling are the reverse of what they are for most other attributes. A value that enables (1) or disables (0) TCP keepalive for all sockets. TCP keepalive supports the periodic transmission of messages on a connected socket in order to keep connections active. If keepalive is enabled, sockets that do not exit cleanly are cleaned up when the keepalive interval expires. If keepalive is not enabled, those sockets will continue to exist until you reboot the sys- tem. Default value: 0 (disabled) Applications enable keepalive for sockets by setting the setsockopt() function's SO_KEEPALIVE option. Use the tcp_keepalive_default attribute to override programs that do not set keepalive on their own, particularly if you have no access to the sources for those programs. Maximum number of keepalive probes that can be sent before a connection is dropped. Default value: TCPTV_KEEPCNT, or 8 (probes) Minimum value: 1 Maximum value: 32767 Idle time before the first keepalive probe. Default value: TCPTV_KEEP_IDLE, or 14400 (in units of .5 seconds) Minimum value: 1 Maximum value: 32767 Initial connect timeout. Default value: TCPTV_KEEP_INIT, or 150 (in units of .5 seconds) Minimum value: 1 Maximum value: 32767 Time between keepalive probes. Default value: TCPTV_KEEP_INTVL, or 150 (in units of .5 seconds) Minimum value: 1 Maximum value: 32767 The maximum lifetime of a TCP segment. Default value: 60 (in units of .5 seconds) Minimum value: 1 Maximum value: 2 billion Default maximum segment size. Default value: TCP_MSS, or 536 (bytes) Minimum value: 1 Maximum value: 2 billion Default receive buffer size for TCP sockets. Default value: TCP_RECVSPACE, or 61440 (bytes) Minimum value: 1 Maximum value: 4 billion (cannot be larger than sb_max) Minimum amount of time between TCP retransmissions. Default value: 2 (in units of .5 seconds), or 1 second Minimum value: 1 Maximum value: 2 billion The maximum number of TCP retransmitted packets to send before giving up. Default value: 128 (packets) Minimum value: 1 Maximum value: INT_MAX, or 2 billion Initial assumed round-trip time, in seconds. Default value: 3 (seconds) Minimum value: 0 Maximum value: INT_MAX, or 2 billion Default send buffer size, in bytes, for TCP sockets. Default value: TCP_SENDSPACE, or 61440 (bytes) Minimum value: 1 Maximum value: UINT_MAX, or 4 billion (cannot be larger than sb_max) IP time-to-live, in router hops, for TCP packets. Default value: TCP_TTL, or 60 (router hops) Minimum value: 0 Maximum value: 255 A value that enables (1) or disables (0) 4.2 BSD-compatible behavior for an urgent pointer. The urgent pointer is a pointer to the first octet of data past the urgent section. When disabled, the urgent pointer is a pointer to the last octet of data in the urgent section. Default value: 1 (enabled) A value that enables (0) or disables (1) delayed acknowledgments. Default value: 0 (enabled) Note The values for disabling and enabling are the reverse of what they are for most other attributes. Number of duplicate acknowledgments (ACKs) before retransmission. Default value: TCPREXMTTHRESH, or 3 (duplicate acknowledgements) Minimum value: 1 Maximum value: INT_MAX, or 2 billion A value that enables (1) or disables (0) the movement of TCP inpcbs in the TIME_WAIT state to the end of the inpcb list. Default value: 0 (disabled) Default receive buffer size, in bytes, for UDP sockets. Default value: UDP_RECVSPACE, or 42240 (bytes) Minimum value: 1 Maximum value: UINT_MAX, or 4 billion (cannot be larger than sb_max) Default send buffer size, in bytes, for UDP sockets. Default value: UDP_SENDSPACE, or 9216 (bytes) Minimum value: 1 Maximum value: UINT_MAX, or 4 billion (cannot be larger than sb_max) IP time-to-live, in router hops, for UDP packets. Default value: UDP_TTL, or 30 (router hops) Minimum value: 0 Maximum value: 255 A value that enables (1) or disables (0) checksumming in the Internet user datagram protocol (UDP). Default value: 1 (enabled) SEE ALSO
sys_attrs(5) Tuning Tru64 UNIX for Internet Servers at the following location: http://www.digital.com/internet/document/ias/tuning.html. System Configuration and Tuning sys_attrs_inet(5)