Re: Strange ARP problem

Justin Cormack wrote:

>
> I think that lots of equipment doesnt like you mixing tagged and  
> untagged traffic on the same network.
>
> If you have to it might help setting the Mac addresses on the two  
> interfaces to be different.
>
So how can I change the mac on the eth0.201 interface?

# ifconfig eth0.201 hw ether 00:0B:DB:A9:1F:D1
SIOCSIFHWADDR: Device or resource busy

Thanks!!!
Normando

>
> On 24 May 2005, at 11:32, Normando Marcolongo wrote:
>
>> Hi!
>>
>> Let me explain the simple architecture here. A linux machine with  
>> kernel 2.6.11.7 (Debian Sarge) and e1000 driver. A Cisco Catalyst  
>> 6509 configured with a trunk port this way:
>>
>> interface GigabitEthernet4/13
>>  switchport
>>  switchport trunk native vlan 100
>>  switchport trunk allowed vlan 100,201
>>  switchport mode trunk
>>
>> The linux machine has:
>>
>> # cat /proc/net/vlan/config
>> VLAN Dev name    | VLAN ID
>> Name-Type: VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
>> eth0.201       | 201  | eth0
>>
>> # ifconfig
>> eth0      Link encap:Ethernet  HWaddr 00:0B:DB:A9:0F:D1
>>           inet addr:172.19.1.11  Bcast:172.19.1.255  Mask: 255.255.255.0
>>           inet6 addr: fe80::20b:dbff:fea9:fd1/64 Scope:Link
>>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>           RX packets:49984 errors:0 dropped:0 overruns:0 frame:0
>>           TX packets:80330 errors:0 dropped:0 overruns:0 carrier:0
>>           collisions:0 txqueuelen:1000
>>           RX bytes:4335305 (4.1 MiB)  TX bytes:110105417 (105.0 MiB)
>>           Base address:0xece0 Memory:fe8e0000-fe900000
>>
>> eth0.201  Link encap:Ethernet  HWaddr 00:0B:DB:A9:0F:D1
>>           inet addr:172.22.1.2  Bcast:172.22.1.255  Mask:255.255.255.0
>>           inet6 addr: fe80::20b:dbff:fea9:fd1/64 Scope:Link
>>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>           RX packets:255 errors:0 dropped:0 overruns:0 frame:0
>>           TX packets:361 errors:0 dropped:0 overruns:0 carrier:0
>>           collisions:0 txqueuelen:0
>>           RX bytes:22471 (21.9 KiB)  TX bytes:21547 (21.0 KiB)
>>
>> If I put a test client on the VLAN100 the linux machine can ping  the 
>> 6509's VLAN100 interface and the test client.
>> Now, I can ping from the linux machine the VLAN201 interface of the  
>> 6509 and (obviuosly) vice versa.
>> If I put a test client on the VLAN201 the test client _cannot_  
>> resolve the MAC address of the linux machine while the linux  machine 
>> has this resolved. If I do a tcpdump on the linux machine I  see:
>> on the eth0.201 the ARP request from the client _and_ the reply  from 
>> the linux machine to the client (this will never reach the  client 
>> for an unknown reason)
>> on the eth0 the same (I think I've understood that this is normal)
>> putting static ARPs on the server/client solves the problem.
>> Can you give me some directions? Need some other information?
>>
>> Thanks,
>> Normando
>> -- Normando Marcolongo | Micso s.r.l. via Tiburtina, 318 | I-65128  
>> Pescara, Italy tel/fax (+39)08554105 | mob. (+39)3386296362
>> <normando.vcf>
>> _______________________________________________
>> Vlan mailing list
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>> http://www.lanforge.com/mailman/listinfo/vlan
>>
>
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>


-- 
  Normando Marcolongo | Micso s.r.l.
   via Tiburtina, 318 | I-65128 Pescara, Italy
tel/fax (+39)08554105 | mob. (+39)3386296362

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