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  #1  
Old November 17th, 2008, 10:30
sibdoma sibdoma is offline
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Default Some problems with CARP
I'm using CARP on FreeBSD 7.1-PRERELEASE.
Code:
sysctl net.inet.carp
net.inet.carp.allow: 1
net.inet.carp.preempt: 1
net.inet.carp.log: 1
net.inet.carp.arpbalance: 1
net.inet.carp.suppress_preempt: 0
And I have some common IP addresses on different vlan's.
I cant use carpdev option on FreeBSD, so, first, i have to appoint ip addresses to my vlan-interfaces.
Finally I have working version of CARP
HOST 1
Code:
ifconfig carp0
carp0: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
        inet 172.17.5.1 netmask 0xffffff00
        carp: MASTER vhid 1 advbase 1 advskew 0

ifconfig carp1
carp1: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
        inet 172.17.5.1 netmask 0xffffff00
        carp: BACKUP vhid 2 advbase 1 advskew 100
HOST 2
Code:
carp0: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
        inet 172.17.5.1 netmask 0xffffff00
        carp: BACKUP vhid 1 advbase 1 advskew 100

carp1: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
        inet 172.17.5.1 netmask 0xffffff00
        carp: MASTER vhid 2 advbase 1 advskew 0
But, dmesg of Host 1 is
Code:
arp: --------- is using my IP address 172.17.5.1 on vlan2!
similar, dmesg of host 2.

Is that normal? or i did something wrong?
Last edited by sibdoma; November 17th, 2008 at 13:02.
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  #2  
Old November 17th, 2008, 11:16
squirL squirL is offline
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Quote:
Originally Posted by sibdoma View Post
I'm using CARP on FreeBSD 7.1-PRERELEASE.
Code:
sysctl net.inet.carp
net.inet.carp.allow: 1
net.inet.carp.preempt: 1
net.inet.carp.log: 1
net.inet.carp.arpbalance: 1
net.inet.carp.suppress_preempt: 0
And I have some common IP addresses on different vlan's.
I cant use carpdev option on FreeBSD, so, first, i have to appoint ip addresses to my vlan-interfaces.
Finally I have working version of CARP
HOST 1
Code:
ifconfig carp0
carp0: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
        inet 172.17.5.1 netmask 0xffffff00
        carp: MASTER vhid 1 advbase 1 advskew 0

ifconfig carp1
carp1: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
        inet 172.17.5.1 netmask 0xffffff00
        carp: BACKUP vhid 2 advbase 1 advskew 100
HOST 2
Code:
carp0: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
        inet 172.17.5.1 netmask 0xffffff00
        carp: BACKUP vhid 1 advbase 1 advskew 100

carp1: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
        inet 172.17.5.1 netmask 0xffffff00
        carp: BACKUP vhid 2 advbase 1 advskew 100
But, dmesg of Host 1 is
Code:
arp: --------- is using my IP address 172.17.5.1 on vlan2!
similar, dmesg of host 2.

Is that normal? or i did something wrong?
what have u set same adresses (172.17.5.1) on both carp interfaces for??
carp0 must differ from carp1
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  #3  
Old November 17th, 2008, 11:49
sibdoma sibdoma is offline
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For arpbalancing.
From man
Code:
 First the carp interfaces on host A are configured.  The advskew of 100
     on the second virtual host means that its advertisements will be sent out
     slightly less frequently.

           ifconfig carp0 create
           ifconfig carp0 vhid 1 pass mekmitasdigoat 192.168.1.10/24
           ifconfig carp1 create
           ifconfig carp1 vhid 2 advskew 100 pass mekmitasdigoat 192.168.1.10/24

     The configuration for host B is identical, except the advskew is on vir-
     tual host 1 rather than virtual host 2.

           ifconfig carp0 create
           ifconfig carp0 vhid 1 advskew 100 pass mekmitasdigoat 192.168.1.10/24
           ifconfig carp1 create
           ifconfig carp1 vhid 2 pass mekmitasdigoat 192.168.1.10/24

     Finally, the ARP balancing feature must be enabled on both hosts:

           sysctl net.inet.carp.arpbalance=1
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  #4  
Old November 17th, 2008, 12:13
squirL squirL is offline
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nice please, look to the man once more.
Code:
carp0: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
        inet 172.17.5.1 netmask 0xffffff00
        carp: BACKUP vhid 1 advbase 1 advskew 100

carp1: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
        inet 172.17.5.1 netmask 0xffffff00
        carp: BACKUP vhid 2 advbase 1 advskew 100
u set the same advskew on both interfaces. i think - it's incorrect. try to set one to 0 for carp1 (host B)

PS: we can discuss your problem in russian using ICQ
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  #5  
Old November 17th, 2008, 13:07
sibdoma sibdoma is offline
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Quote:
Originally Posted by squirL View Post
nice please, look to the man once more.

u set the same advskew on both interfaces. i think - it's incorrect. try to set one to 0 for carp1 (host B)

PS: we can discuss your problem in russian using ICQ
Sorry, I made a mistake when copying. Fixed...
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  #6  
Old November 20th, 2008, 12:18
sibdoma sibdoma is offline
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The problem is solved. Thanks to squirL for help.
vlan interfaces and carp interfaces have to have different IP from one subnet, BUT NOT yhe same IP.
Example,

vlan2: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MU LTICAST> metric 0 mtu 1500
options=3<RXCSUM,TXCSUM>
ether 00:30:48:d2:12:07
inet 172.17.5.253 netmask 0xffffff00 broadcast 172.17.5.255

and

carp0: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
inet 172.17.5.1 netmask 0xffffff00
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