High packet loss :-(

Grant orbman at thingysrealm.myftp.org
Tue May 25 16:51:26 BST 2004


William Cooper wrote:

> Grant wrote:
>
>> Hi,
>>
>> was reading about stress testing networks... so i thought i would try 
>> mine out, every single box passed (0% loss) apart from  my freebsd 
>> 4.9 box...
>>
>> <output>
>> ping -f 192.168.254.1
>>
>> PING 192.168.254.1 (192.168.254.1) 56(84) bytes of data.
>> ....................................................
>> --- 192.168.254.1 ping statistics ---
>> 1445 packets transmitted, 1200 received, 16% packet loss, time 5774ms
>> rtt min/avg/max/mdev = 0.198/0.600/22.715/2.413 ms, pipe 2, ipg/ewma 
>> 3.999/0.229 ms
>>
>> #
>> <end output>
>>
>> the pc has two network cards in, one set with ip 
>> 192.168.254.1/255.255.255.0 and the other set to 10.0.0.222/255.0.0.0
>>
>> they were setup like that so that the 192.168.254.1 is for hosting my 
>> website and mail server to the internet and the 10.0.0.222 was for 
>> internal, use like for storage.
>>
>> no matter which ip i ping from to that box i still get lost packets, 
>> i have changed the cables to be sure, but yet i still get packet 
>> loss, but i have noticed on the local console i get this:
>>
>> arp: 10.0.0.2 is on dc0 but got reply from 00:02:a5:3f:3a:6c on xl0
>> arp: 10.0.0.2 is on dc0 but got reply from 00:02:a5:3f:3a:6c on xl0
>> arp: 192.168.254.200 is on xl0 but got reply from 00:08:c7:3b:67:93 
>> on dc0
>>
>> i get quite a few of these during a day... any ideas??
>>
>> the cards are:
>>
>> 192.168.254.1 = 3Com 3c905C-TX Fast Etherlink XL
>>
>> 10.0.0.222 = Accton EN2242 MiniPCI 10/100BaseTX
>>
>> is there something wrong with the server hardware? or is it something 
>> in freebsd that is stopping it?
>>
>> Any help greatful.
>> Thanks
>> Grant.
>>
>> Ps = sorry for the long post
>>
>>
>>
>>
>> ------ FreeBSD UK Users' Group  -  Mailing List ------
>> http://listserver.uk.freebsd.org/mailman/listinfo/freebsd-users
>>
> Hi there,
>
> I believe FreeBSD is limiting the packets, if you do a tail 
> /var/log/messages after pinging the machine you may see messages like 
> this:
>
> May 25 16:01:34 machinename kernel: Limiting icmp ping response from 
> 247 to 200 packets/sec
>
> Regards,
>
> William
>
>
freebsd /kernel: Limiting icmp ping response from 246 to 200 packets per 
second

yea i got a few of them...

is its a feature of freebsd only or something? as its the only freebsd 
box i have... none of the linux boxes do that...

is its some sort of protection?

sorry for all the questions.

Thanks.
Grant.





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