Default: 87380*2 bytes.
tcp_mem - vector of 3 INTEGERs: min, pressure, max
- low: below this number of pages TCP is not bothered about its
+ min: below this number of pages TCP is not bothered about its
memory appetite.
pressure: when amount of memory allocated by TCP exceeds this number
of pages, TCP moderates its memory consumption and enters memory
pressure mode, which is exited when memory consumption falls
- under "low".
+ under "min".
- high: number of pages allowed for queueing by all TCP sockets.
+ max: number of pages allowed for queueing by all TCP sockets.
Defaults are calculated at boot time from amount of available
memory.
Defaults to 128. See also tcp_max_syn_backlog for additional tuning
for TCP sockets.
+tcp_workaround_signed_windows - BOOLEAN
+ If set, assume no receipt of a window scaling option means the
+ remote TCP is broken and treats the window as a signed quantity.
+ If unset, assume the remote TCP is not broken even if we do
+ not receive a window scaling option from them.
+ Default: 0
+
+tcp_slow_start_after_idle - BOOLEAN
+ If set, provide RFC2861 behavior and time out the congestion
+ window after an idle period. An idle period is defined at
+ the current RTO. If unset, the congestion window will not
+ be timed out after an idle period.
+ Default: 1
+
IP Variables:
ip_local_port_range - 2 INTEGERS
The max value from conf/{all,interface}/arp_ignore is used
when ARP request is received on the {interface}
+arp_accept - BOOLEAN
+ Define behavior when gratuitous arp replies are received:
+ 0 - drop gratuitous arp frames
+ 1 - accept gratuitous arp frames
+
app_solicit - INTEGER
The maximum number of probes to send to the user space ARP daemon
via netlink before dropping back to multicast probes (see
Functional default: enabled if local forwarding is disabled.
disabled if local forwarding is enabled.
+accept_ra_defrtr - BOOLEAN
+ Learn default router in Router Advertisement.
+
+ Functional default: enabled if accept_ra is enabled.
+ disabled if accept_ra is disabled.
+
+accept_ra_pinfo - BOOLEAN
+ Learn Prefix Inforamtion in Router Advertisement.
+
+ Functional default: enabled if accept_ra is enabled.
+ disabled if accept_ra is disabled.
+
+accept_ra_rt_info_max_plen - INTEGER
+ Maximum prefix length of Route Information in RA.
+
+ Route Information w/ prefix larger than or equal to this
+ variable shall be ignored.
+
+ Functional default: 0 if accept_ra_rtr_pref is enabled.
+ -1 if accept_ra_rtr_pref is disabled.
+
+accept_ra_rtr_pref - BOOLEAN
+ Accept Router Preference in RA.
+
+ Functional default: enabled if accept_ra is enabled.
+ disabled if accept_ra is disabled.
+
accept_redirects - BOOLEAN
Accept Redirects.
Autoconfigure addresses using Prefix Information in Router
Advertisements.
- Functional default: enabled if accept_ra is enabled.
- disabled if accept_ra is disabled.
+ Functional default: enabled if accept_ra_pinfo is enabled.
+ disabled if accept_ra_pinfo is disabled.
dad_transmits - INTEGER
The amount of Duplicate Address Detection probes to send.
Default Maximum Transfer Unit
Default: 1280 (IPv6 required minimum)
+router_probe_interval - INTEGER
+ Minimum interval (in seconds) between Router Probing described
+ in RFC4191.
+
+ Default: 60
+
router_solicitation_delay - INTEGER
Number of seconds to wait after interface is brought up
before sending Router Solicitations.