2013-03-07 15:50:23 +01:00
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IPv4LL in SUSE Linux
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====================
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IPv4LL provides support of peer to peer address assignment from a
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special link local IP range.
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SUSE Linux contains three implementations of IPv4LL autoip protocol:
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avahi-autoipd from avahi-autoipd package from avahi project
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===========================================================
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This is a daemon, that runs and assign IPv4LL address, either as a
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fallback or at any time, depending on System/Zeroconf
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AVAHI_AUTOIPD_FORCE_BIND sysconfig key (disabled by default).
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The daemon runs permanently for each device, monitors the network
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status, and assigns IPv4LL address when requested.
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See http://avahi.org/wiki/AvahiAutoipd#ModesofOperation for more.
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Activate avahi-autoipd implementation
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-------------------------------------
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- Install avahi-autoip package and check that System/Zeroconf
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AVAHI_AUTOIPD_FORCE_BIND sysconfig key is "yes" (the default).
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- Set the address settings in the YaST network configuration either to
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None (to have IPv4LL address only) or DHCP (if you want DHCP together
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with IPv4LL).
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- Note that NetworkManager uses avahi-autoipd by default.
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For AVAHI_AUTOIPD_FORCE_BIND=false:
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-----------------------------------
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In this mode the daemon assigns IPv4LL address only of DHCP fails.
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Advantage:
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- All programs work with this setup.
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Disadvantage:
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- When DHCP assigns address, all existing IPv4LL connections are lost.
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For AVAHI_AUTOIPD_FORCE_BIND=true:
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----------------------------------
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In this mode the deamon forces binding address from IPv4LL address, even if
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standard IPv4 address exists.
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Advantage:
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- You can depend on IPv4LL address always assigned.
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Disadvantage:
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- Some programs don't work well with labeled IP addresses or interface
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aliases.
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autoip from sysconfig package
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=============================
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2014-03-19 13:45:22 +01:00
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autoip is not bound to sysconfig scripts and it is not called during
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as sysconfig is using an own implementation. To enable you have to
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set AVAHI_AUTOIPD_ENABLE=yes in /etc/sysconfig/avahi. Note, that it
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starts unconditionally then and breaks bridges,vlan,bond, ...
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2013-03-07 15:50:23 +01:00
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If DHCP adrress is assigned, autoip ends immediately. Only if no DHCP
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address is assigned, it stays running as a daemon and provides IPv4LL
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address.
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Activate autoip implementation
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------------------------------
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- Do not install avahi-autoipd package or set System/Zeroconf
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AVAHI_AUTOIPD_FORCE_BIND sysconfig key to "no".
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- Set Zeroconf the address settings in the YaST network configuration.
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IPv4LL assigned by dhcpcd
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=========================
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If dhcpcd fails to obtain a lease, it will probe for a valid IPv4LL
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address. Once obtained it will probe every 10 seconds for a DHCP server.
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Activate dhcpcd implementation
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------------------------------
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This implementation is not supported in SUSE yet. Enabling this
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implementation would require several manual changes in the
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/sbin/ifup-dhcp script (removal of -L argument, and skipping of calls to
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${SCRIPTNAME}-autoip in /sbin/ifup (e. g. by not setting Zeroconf in the
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YaST network configuration).
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