When configuring 2 VLANs to be on the same subnet, only one works.

[JASSAL Aman]

Hello Eitan,

I am no expert but I believe Stefan is right, your having a netmask of
255.0.0.0 does look strange. The way I see it, I think you are trying to
configure 2 IP addresses belonging to the same subnet (91.0.0.0/8) on your
interface, but only the first address is taken into account (91.154.12.5
on sw259 and 91.154.12.6 on sw260). Hence ping 91.154.12.6 from sw259
fails. Setting a netmask of 255.255.0.0 as Stefan suggested should solve
your problem.

Kind regards,


Aman Jassal



Le Mar 13 janvier 2009 15:03, Stefan Lambrev a écrit :
> Greetings,
>
>
> For me your configuration looks invalid. Try with netmask 255.255.0.0
> The question here is why freebsd allow this.
>
>
> On Jan 13, 2009, at 3:09 PM, Eitan Shefi wrote:
>
>
>> I'm testing a NIC driver.
>> I use 2 directly connected FreeBSD-7.0 hosts.
>> When I create 2 VLANs for the same interface (mtnic0), on each host,
>> and configure the VLANs on each host to be on the same subnet: ping works
>> only to one of the VLANs.
>>
>> I run:
>> On sw259:
>> /sbin/ifconfig vlan1 create vlan 1 vlandev mtnic0
>> /sbin/ifconfig vlan2 create vlan 2 vlandev mtnic0
>> /sbin/ifconfig vlan1 91.154.12.5 netmask 255.0.0.0
>> /sbin/ifconfig vlan2 91.155.12.5 netmask 255.0.0.0
>>
>>
>> On sw260:
>> /sbin/ifconfig vlan1 create vlan 1 vlandev mtnic0
>> /sbin/ifconfig vlan2 create vlan 2 vlandev mtnic0
>> /sbin/ifconfig vlan1 91.154.12.6 netmask 255.0.0.0
>> /sbin/ifconfig vlan2 91.155.12.6 netmask 255.0.0.0
>>
>>
>> Now on sw259 run:
>> ping 91.154.12.6 - works. ping 91.155.12.6 - does not work.
>>
>> I saw the same behavior also when running via a different NIC.
>>
>>
>>
>> Is this expected ?
>>
>>
>>
>> Thanks,
>> Eitan.
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>
> --
> Best Wishes,
> Stefan Lambrev
> ICQ# 24134177
>
>
>
>
>
>
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