Date: Wed, 6 Apr 2011 14:41:11 +0200 (CEST) From: Ingo Flaschberger <if@freebsd.org> To: freebsd-net@freebsd.org Subject: Re: Routing enhancement - reduce routing table locking Message-ID: <alpine.LRH.2.00.1104061426350.2152@filebunker.xip.at> In-Reply-To: <alpine.LRH.2.00.1104050303140.2152@filebunker.xip.at> References: <alpine.LRH.2.00.1104050303140.2152@filebunker.xip.at>
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Hi,
regarding multipath problems:
Setup which should work:
+--------+ +--------+
|Router A|----(ospf)----|Router B|
+--------+ +--------+
|(carp) |(carp)
| |
+----------+-----------+
|
Lan
Router A & B run quagga and exchange routing table.
Router B has during failover of carp a route to lan via ospf/router A and
a direct connected interface.
Thus FreeBSD carp is not able to handle this correctly, I use a modified
version of ucarp.
Testsetup:
+---------+ (em1) +-----+
| FreeBSD |--------------|Probe|
+---------+ +-----+
Probe: 10.13.13.95/24
FreeBSD:
em2: 10.11.11.100/24
++ probe answer ping
-- probe does not answer ping
Script:
--- snip ---
ifconfig em1 alias 10.13.13.90/24
ping -c 1 10.13.13.95
++
route add 10.13.13.0/24 10.11.11.1 -weight 2
ping -c 1 10.13.13.95
++
route add 10.13.13.0/24 10.11.11.2 -weight 3
ping -c 1 10.13.13.95
++
route delete 10.13.13.0/24 10.11.11.1
ping -c 1 10.13.13.95
++
route delete 10.13.13.0/24 10.11.11.2
ping -c 1 10.13.13.95
++
ifconfig em1 -alias 10.13.13.90
ping -c 1 10.13.13.95
--
route add 10.13.13.0/24 10.11.11.1 -weight 2
ping -c 1 10.13.13.95
--
ifconfig em1 alias 10.13.13.90/24
ping -c 1 10.13.13.95
++
route add 10.13.13.0/24 10.11.11.2 -weight 3
ping -c 1 10.13.13.95
++
ifconfig em1 -alias 10.13.13.90
ping -c 1 10.13.13.95
--
route delete 10.13.13.0/24 10.11.11.1
ping -c 1 10.13.13.95
--
route delete 10.13.13.0/24 10.11.11.2
ping -c 1 10.13.13.95
--
route add 10.13.13.0/24 10.11.11.1 -weight 2
ping -c 1 10.13.13.95
--
route add 10.13.13.0/24 10.11.11.2 -weight 3
ping -c 1 10.13.13.95
--
ifconfig em1 alias 10.13.13.90/24
ping -c 1 10.13.13.95
++
route delete 10.13.13.0/24 10.11.11.2
ping -c 1 10.13.13.95
++
route delete 10.13.13.0/24 10.11.11.1
ping -c 1 10.13.13.95
++
ifconfig em1 -alias 10.13.13.90
--
route add 10.13.13.0/24 10.11.11.1
ifconfig em1 alias 10.13.13.90/24
ifconfig em1 down
ifconfig em1 up
ifconfig em1 down
ifconfig em1 -alias 10.13.13.90
route delete 10.13.13.0/24 10.11.11.1
ifconfig em1 alias 10.13.13.90/24
route add 10.13.13.0/24 10.11.11.1
ifconfig em1 down
ifconfig em1 up
ifconfig em1 down
--- snap ---
If this script runs without any kernels errors (dmesg), crashes and probe
replies accordingly - then everything is alright.
Mit freundlichen Gruessen,
Ingo Flaschberger
Geschaeftsleitung
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