Strange kernel messages?
Grant
orbman at thingysrealm.myftp.org
Tue Aug 10 13:52:29 BST 2004
Kevin O'Connor wrote:
>
>
>>-----Original Message-----
>>From: Grant [mailto:orbman at thingysrealm.myftp.org]
>>Sent: 10 August 2004 13:19
>>To: kevin at ziptek-technologies.co.uk
>>Cc: freebsd-users at uk.freebsd.org
>>Subject: Re: Strange kernel messages?
>>
>>Kevin O'Connor wrote:
>>
>>
>>
>>>
>>>
>>>>-----Original Message-----
>>>>From: freebsd-users-admin at uk.freebsd.org [mailto:freebsd-users-
>>>>admin at uk.freebsd.org] On Behalf Of Grant
>>>>Sent: 10 August 2004 11:44
>>>>To: kevin at ziptek-technologies.co.uk
>>>>Cc: freebsd-users at uk.freebsd.org
>>>>Subject: Re: Strange kernel messages?
>>>>
>>>>Kevin O'Connor wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>It's just arp telling you that both nics are on the same network.
>>>>>This will stop arp messages being logged
>>>>>
>>>>>Sysctl net.link.ether.inet.log_arp_movements=0
>>>>>
>>>>>Of course sorting out the problem would be better, it's never a good
>>>>>
>>>>>
>>idea
>>
>>
>>>>>
>>>>>
>>>>to
>>>>
>>>>
>>>>
>>>>
>>>>>run 2 completely different subnets through the same hub
>>>>>Regards
>>>>>Kevin
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>-----Original Message-----
>>>>>>From: freebsd-users-admin at uk.freebsd.org [mailto:freebsd-users-
>>>>>>admin at uk.freebsd.org] On Behalf Of Grant
>>>>>>Sent: 10 August 2004 11:24
>>>>>>To: freebsd-users at uk.freebsd.org
>>>>>>Subject: Strange kernel messages?
>>>>>>
>>>>>>Hi,
>>>>>>
>>>>>>Got a few freebsd servers and i have noticed quite alot of these
>>>>>>messages on the console and in the logs.
>>>>>>
>>>>>>arp: 10.0.0.100 moved from 00:c0:4f:26:a8:83 to 00:08:c7:3b:67:93 on
>>>>>>
>>>>>>
>>fxp0
>>
>>
>>>>>>arp: 10.0.0.100 moved from 00:08:c7:3b:67:93 to 00:c0:4f:26:a8:83 on
>>>>>>
>>>>>>
>>fxp0
>>
>>
>>>>>>arp: 10.0.0.100 moved from 00:c0:4f:26:a8:83 to 00:08:c7:3b:67:93 on
>>>>>>
>>>>>>
>>fxp0
>>
>>
>>>>>>There is two networks one 10.0.0.0/255.0.0.0 and the second
>>>>>>192.168.254.0/255.255.255.0
>>>>>>
>>>>>>The ip 10.0.0.100 is a proxy/gateway running clarkconnect with dual
>>>>>>network cards one on 10.0.0.100 and one 192.168.254.100
>>>>>>
>>>>>>The messages only seem to show up on the freebsd boxes, there is 3
>>>>>>
>>>>>>
>>boxes
>>
>>
>>>>>>that show these messages.
>>>>>>
>>>>>>The first is 10.0.0.222 which has dual cards with the other interface
>>>>>>
>>>>>>
>>at
>>
>>
>>>>>>192.168.254.1
>>>>>>The second box only has one card with ip of 10.0.0.60
>>>>>>The third box only one card again with ip 10.0.0.70
>>>>>>
>>>>>>These machines are all linked to a 24port 3Com hub... just in case that
>>>>>>is the problem :(
>>>>>>
>>>>>>The question is what is it ? and should i be worried at the amount i am
>>>>>>getting of them ? and can it be stopped ?
>>>>>>
>>>>>>Thanks
>>>>>>Grant.
>>>>>>
>>>>>>ps - The first box runs 4.10 and the second and third are running 5.2.1
>>>>>>There is some linux boxes but they dont show any of the messages.
>>>>>>
>>>>>>
>>>>>>------ FreeBSD UK Users' Group - Mailing List ------
>>>>>>http://listserver.uk.freebsd.org/mailman/listinfo/freebsd-users
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>Hey,
>>>>
>>>>Thanks for the quick reply!
>>>>
>>>>So maybe just get myself another hub and then put all the 10.0.0.0
>>>>network on that and leave the 192.168.254.0 on the original hub ?
>>>>
>>>>I still dont quite get why i get them though as they are on different
>>>>networks the subnets are different and so is the ranges... would a
>>>>switch help instead of a hub ?
>>>>
>>>>Thanks
>>>>Grant.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>Ah you want to know why, this comes up every year or so.
>>>Lets assume fxp0 and fxp1 are on the 10.0.0.0/8 network and fxp2 and fxp3
>>>are on the 192.168.254.0/24 network. (Just 2 boxes in this example)
>>>If fxp1 says hello I'm here fxp0 gets the message and builds an arp entry
>>>In the form
>>>IP address MAC address
>>>so far no problem but you have routing enabled and that is saying if you
>>>want to reach the 10.0.0.0/8 network route through fxp2 or fxp3 (internal
>>>
>>>
>>to
>>
>>
>>>the boxes) and that gives a different MAC address.You have two routes to
>>>
>>>
>>the
>>
>>
>>>different networks one internal and the other external through the hub. So
>>>what is happening is you are building one arp entry for the internal route
>>>and then scrapping it and building a new entry from the external route.
>>>
>>>
>>This
>>
>>
>>>is not a fault it is nothing to worry about in this case.
>>>
>>>This answer is very simplistic and is only designed to allow you to
>>>visualize the problem. To fully understand the problem you will need to do
>>>quite a bit of reading.
>>>
>>>If you wish to use a switch it will need to be layer 3 to allow it to be
>>>split between the two networks. Two hubs or layer 2 switches will solve it
>>>as well.
>>>Hope this helps.
>>>Regards
>>>Kevin
>>>
>>>
>>>
>>>
>>>
>>>
>>Hey,
>>
>>Well i think i will have to pass on getting a layer 3 switch, i just had
>>a look at the price of some of them! damn! heh.
>>
>>I have made a before and after diagram, the before is what it currently
>>looks like with these messages popping up and the after is what i think
>>would make them stop.
>>
>>http://orbsrealm.com/rackmount/pub/images/before.jpeg
>>http://orbsrealm.com/rackmount/pub/images/after.jpg
>>
>>I think thats how i could stop these messages, but i just want someone
>>to kind of confirm it before i go moving cables :)
>>
>>Thanks again
>>Grant.
>>
>>
>
>Why two gateways between the networks both server1 and the box labeled
>gateway/proxy or will you not be routing on server1 or are you being cleaver
>and using gated. Apart from that question it seems fine.
>Regards
>Kevin
>
>
>
>
Hey,
There isnt two gateways, the gateway/proxy is the only one that routes
the internet around and filters it for the clients the other link from
server1 is used for storage for the clients.
I dont think i need two gateways to the same network, unless one goes
down but i am allways about to fix it so it should be ok, but maybe
thats something to look at in the future.
other than that it all looks ok and i should move the 192.168.254.0 to
the new place in that image ?
Thanks again
Grant.
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