Bug 42062

Summary: 2 computers with the same network interface is not working
Product: Base System Reporter: Lucky <lucky>
Component: miscAssignee: freebsd-bugs (Nobody) <bugs>
Status: Closed FIXED    
Severity: Affects Only Me    
Priority: Normal    
Version: Unspecified   
Hardware: Any   
OS: Any   

Description Lucky 2002-08-27 09:10:01 UTC
      It seems that if I use the same type of ethernet card in 2 dif machines then the machines wont communicate with each other. I have 2 identical machines. 1.webserver 2.backup for webserver. When trying to ping each other I get "HOST IS DOWN" when they're not.
Do I have to use separate types of ethernet cards in these machines? Seems a little odd.
Sincerely,
Lucky
Comment 1 Maxim Maximov 2002-08-27 10:14:03 UTC
please post 'netstat -rn' and 'ifconfig dc0' output from both machines. 
it seems either you have bad connectivity, or your routing is misconfigured.

Lucky wrote:
>>Number:         42062
>>Category:       misc
>>Synopsis:       2 computers with the same network interface is not working
>>Release:        4.5
>>Environment:
> 
> ifconfig dc0 inet 61.194.20.35 netmask 255.255.255.248
> other pc is
>       ifconfig dc0 inet 61.194.20.36 netmask 255.255.255.248
> 
>>Description:
> 
>       It seems that if I use the same type of ethernet card in 2 dif machines then the machines wont communicate with each other. I have 2 identical machines. 1.webserver 2.backup for webserver. When trying to ping each other I get "HOST IS DOWN" when they're not.
> Do I have to use separate types of ethernet cards in these machines? Seems a little odd.
> Sincerely,
> Lucky


-- 
Maxim Maximov
System Administrator
AGAVA Software (http://www.agava.com)
Comment 2 Maxim Maximov 2002-08-29 13:01:59 UTC
Adding to audit-trail:

Maxim Maximov wrote:
 > you have the same MAC addresses on both NICs. This shouldn't be. Either
 > try newer FreeBSD release (4.6.2) or post another bug with output of
 > ifconfig's.
 >
 > Lucky wrote:
 >
 >> MACHINE 1 (web1)
 >>
 >> ifconfig dc0
 >> dc0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
 >>         inet 61.194.20.36 netmask 0xfffffff8 broadcast 61.194.20.39
 >>         inet6 fe80::a00:8ff:fe00:800%dc0 prefixlen 64 scopeid 0x1
 >>         ether 08:00:08:00:08:00
 >>         media: Ethernet autoselect (100baseTX <full-duplex>)
 >>         status: active
 >> MACHINE 2 (backup)
 >>
 >>
 >> ifconfig dc0
 >> dc0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
 >>         inet 61.194.20.35 netmask 0xfffffff8 broadcast 61.194.20.39
 >>         inet6 fe80::a00:8ff:fe00:800%dc0 prefixlen 64 scopeid 0x1
 >>         ether 08:00:08:00:08:00
 >>         media: Ethernet autoselect (100baseTX <full-duplex>)
 >>         status: active
 >>
 >> ----- Original Message -----
 >> From: "Maxim Maximov" <mcsi@agava.com>
 >> To: "Lucky" <lucky@jen2000.com>
 >> Cc: <freebsd-gnats-submit@FreeBSD.ORG>
 >> Sent: Tuesday, August 27, 2002 6:14 PM
 >> Subject: Re: misc/42062: 2 computers with the same network interface
 >> is not
 >> working
 >>
 >>
 >>
 >>> please post 'netstat -rn' and 'ifconfig dc0' output from both machines.
 >>> it seems either you have bad connectivity, or your routing is
 >>
 >>
 >> misconfigured.
 >>
 >>> Lucky wrote:
 >>>
 >>>>> Number:         42062
 >>>>> Category:       misc
 >>>>> Synopsis:       2 computers with the same network interface is not
 >>>>
 >>>>
 >> working
 >>
 >>>>> Release:        4.5
 >>>>> Environment:
 >>>>
 >>>>
 >>>> ifconfig dc0 inet 61.194.20.35 netmask 255.255.255.248
 >>>> other pc is
 >>>>      ifconfig dc0 inet 61.194.20.36 netmask 255.255.255.248
 >>>>
 >>>>
 >>>>> Description:
 >>>>
 >>>>
 >>>>      It seems that if I use the same type of ethernet card in 2 dif
 >>>
 >>>
 >> machines then the machines wont communicate with each other. I have 2
 >> identical machines. 1.webserver 2.backup for webserver. When trying to
 >> ping
 >> each other I get "HOST IS DOWN" when they're not.
 >>
 >>>> Do I have to use separate types of ethernet cards in these machines?
 >>>
 >>>
 >> Seems a little odd.
 >>
 >>>> Sincerely,
 >>>> Lucky
 >>>
 >>>
 >>>
 >>> --
 >>> Maxim Maximov
 >>> System Administrator
 >>> AGAVA Software (http://www.agava.com)
 >>>
 >>>
 >>>
 >>
 >>
 >>
 >
 >




-- 
Maxim Maximov
System Administrator
AGAVA Software (http://www.agava.com)
Comment 3 Jens Schweikhardt freebsd_committer freebsd_triage 2003-08-06 20:07:01 UTC
State Changed
From-To: open->closed

User configuration error: NICs have identical MAC addresses.