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INTRO (7) NetBSD Miscellaneous Information Manual INTRO (7 ...

INTRO (7) NetBSD Miscellaneous Information Manual INTRO (7 ...

SYSCTL (7)

SYSCTL (7) NetBSD Miscellaneous Information Manual SYSCTL (7) tcp ident struct no tcp drop struct no tcp sack.enable integer yes tcp sack.globalholes integer no tcp sack.globalmaxholes integer yes tcp sack.maxholes integer yes tcp ecn.enable integer yes tcp ecn.maxretries integer yes tcp congctl.selected string yes tcp congctl.available string yes tcp abc.enable integer yes tcp abc.aggressive integer yes udp checksum integer yes udp do_loopback_cksum integer yes udp recvspace integer yes udp sendspace integer yes The variables are as follows: arp.down Failed ARP entry lifetime. arp.keep Valid ARP entry lifetime. arp.prune ARP cache pruning interval. arp.refresh ARP entry refresh interval. carp.allow If set to 0, incoming carp(4) packets will not be processed. If set to any other value, processing will occur. Enabled by default. carp.arpbalance If set to any value other than 0, the ARP balancing functionality of carp(4) is enabled. When ARP requests are received for an IP address which is part of any virtual host, carp will hash the source IP in the ARP request to select one of the virtual hosts from the set of all the virtual hosts which have that IP address. The master of that host will respond with the correct virtual MAC address. Disabled by default. carp.log If set to any value other than 0, carp(4) will log errors. Disabled by default. carp.preempt If set to 0, carp(4) will not attempt to become master if it is receiving advertisements from another active master. Ifset to any other value, carp will become master of the virtual host if it believes itcan send advertisements more frequently than the current master. Disabled by default. ip.allowsrcrt If set to 1, the host accepts source routed packets. ip.anonportmax The highest port number to use for TCP and UDP ephemeral port allocation. This cannot be set to less than 1024 or greater than 65535, and must be greater than NetBSD 3.0 December 27, 2007 15

SYSCTL (7) NetBSD Miscellaneous Information Manual SYSCTL (7) ip.anonportmin. ip.anonportmin The lowest port number to use for TCP and UDP ephemeral port allocation. This cannot be set to less than 1024 or greater than 65535. ip.checkinterface If set to non-zero, the host will reject packets addressed to it that arrive on aninterface not bound to that address. Currently, this must be disabled if ipnat is used to translate the destination address to another local interface, or if addresses are added to the loopback interface instead of the interface where the packets for those packets are received. ip.directed-broadcast If set to 1, enables directed broadcast behavior for the host. ip.do_loopback_cksum Perform IP checksum on loopback. ip.forwarding If set to 1, enables IP forwarding for the host, meaning that the host is acting as a router. ip.forwsrcrt If set to 1, enables forwarding of source-routed packets for the host. This value may only be changed if the kernel security level isless than 1. ip.gifttl The maximum time-to-live (hop count) value for an IPv4 packet generated by gif(4) tunnel interface. ip.grettl The maximum time-to-live (hop count) value for an IPv4 packet generated by gre(4) tunnel interface. ip.hashsize The size of IPv4 Fast Forward hash table. This value must be a power of 2 (64, 256...). Alarger hash table size results in fewer collisions. Also see ip.maxflows. ip.hostzerobroadcast All zeroes address is broadcast address. ip.lowportmax The highest port number to use for TCP and UDP reserved port allocation. This cannot be set to less than 0 or greater than 1024, and must be greater than ip.lowportmin. ip.lowportmin The lowest port number to use for TCP and UDP reserved port allocation. This cannot be set to less than 0 or greater than 1024, and must be smaller than ip.lowportmax. ip.maxflows IPv4 Fast Forwarding is enabled by default. If set to 0, IPv4 Fast Forwarding is disabled. ip.maxflows controls the maximum amount of flows which can be created. The default value is 256. ip.maxfragpackets The maximum number of fragmented packets the node will accept. 0means that the node will not accept any fragmented packets. −1 means that the node will accept as many fragmented packets as it receives. The flag is provided basically for avoiding possible DoS attacks. NetBSD 3.0 December 27, 2007 16

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