11.2.2. conf/all/*
Change all the interface-specific settings.
Exception: "conf/all/forwarding" has a different meaning here
11.2.2.1. conf/all/forwarding
This enables global IPv6 forwarding between all interfaces.
In IPv6 you can't control forwarding per device, forwarding control has to be done using IPv6-netfilter (controlled with ip6tables) rulesets and specify input and output devices (see Firewalling/Netfilter6 for more). This is different to IPv4, where you are able to control forwarding per device (decision is made on interface where packet came in).
This also sets all interfaces' Host/Router setting 'forwarding' to the specified value. See below for details. This referred to as global forwarding.
If this value is 0, no IPv6 forwarding is enabled, packets never leave another interface, neither physical nor logical like e.g. tunnels.
11.2.3. conf/interface/*
Change special settings per interface.
The functional behaviour for certain settings is different depending on whether local forwarding is enabled or not.
11.2.3.1. accept_ra
Accept Router Advertisements, and autoconfigure this interface with received data.
11.2.3.2. accept_redirects
Accept Redirects sent by an IPv6 router.
11.2.3.3. autoconf
Type: BOOLEAN
Default: TRUE
Configure link-local addresses (see also Addresstypes) using L2 hardware addresses. E.g. this generates automagically an address like "fe80::201:23ff:fe45:6789" on an interface with a L2-MAC address.
11.2.3.4. dad_transmits
The amount of Duplicate Address Detection probes to send.
11.2.3.5. forwarding
Configure interface-specific Host/Router behaviour.
Note: It is recommended to have the same setting on all interfaces; mixed router/host scenarios are rather uncommon.
IsRouter flag is not set in Neighbour Advertisements.
Router Solicitations are being sent when necessary.
If accept_ra is TRUE (default), accept Router Advertisements (and do autoconfiguration).
If accept_redirects is TRUE (default), accept Redirects.
IsRouter flag is set in Neighbour Advertisements.
Router Solicitations are not sent.
Router Advertisements are ignored.
Redirects are ignored.
11.2.3.6. hop_limit
Default Hop Limit to set.
11.2.3.7. mtu
Default Maximum Transfer Unit
11.2.3.8. router_solicitation_delay
Number of seconds to wait after interface is brought up before sending Router Solicitations.
11.2.3.9. router_solicitation_interval
Number of seconds to wait between Router Solicitations.
11.2.3.10. router_solicitations
Number of Router Solicitations to send until assuming no routers are present.
11.2.4. neigh/default/*
Change default settings for neighbor detection and some special global interval and threshold values:
11.2.4.1. gc_thresh1
Type: INTEGER
Default: 128
More to be filled.
11.2.4.2. gc_thresh2
Type: INTEGER
Default: 512
More to be filled.
11.2.4.3. gc_thresh3
Type: INTEGER
Default: 1024
Tuning parameter for neighbour table size.
Increase this value if you have a lot of interfaces and problem with routes start to act mysteriously and fail. Or if a running Zebra (routing daemon) reports:
ZEBRA: netlink-listen error: No buffer space available, type=RTM_NEWROUTE(24), seq=426, pid=0 |
11.2.4.4. gc_interval
More to be filled.
