From: Mark Mirrotto (mmirrott@xxxxxxxxxxx)
Date: Sat Aug 14 1999 - 23:16:12 GMT-3
If you use a 0.0.0.0 wildcard mask, won't that only advertise the interface
address by itself? And if so, does it truly meet the requirements of the
question in the lab? I realize the interface will be reachable, but other
address on the same subnet won't. Isn't that correct?
Mark
-----Original Message-----
From: Mark S. Detrick <mark@detrick.com>
To: Jason Aarons <jaarons@hotmail.com>; scotto@iworksys.com
<scotto@iworksys.com>
Cc: ccielab@groupstudy.com <ccielab@groupstudy.com>
Date: Saturday, August 14, 1999 2:49 PM
Subject: Re: OSPF network; inverse mask question....
>Folks,
>
>Actually, inverse masks are not limited to the ones below. It is just that
>the ones below are the most useful. For example, you could use 0.0.0.6,
>which makes the last bit an "I care" bit. The value of that bit is
dictated
>by the IP you place before it in the statement. In the case of 10.0.0.0,
>all IPs with EVEN numbers (even because the last bit of the last octet is a
>0 which implys even numbers) in the range 10.0.0.0 to 10.0.0.7.
>
>Indeed, not very useful but thought I would mention it just for the
>understanding of how it works. Any bit you make 0 in the mask uses the
>corresponding bit value from the IP octet to designate which IPs will be
>used in OSFP, for example. Any bit you make 1 is a don't care.
>
>My suggestion for the test is to use 0.0.0.0 and specify all the interfaces
>you want specifically (there aren't that many). That way there is no
>confusion.
>
>Mark Detrick
>----- Original Message -----
>From: Jason Aarons <jaarons@hotmail.com>
>To: <scotto@iworksys.com>
>Cc: <ccielab@groupstudy.com>
>Sent: Tuesday, August 10, 1999 5:29 PM
>Subject: Re: OSPF network; inverse mask question....
>
>
>> Actually I tried 0.0.0.252; it isn't a valid reverse valid wildcard mask.
>>
>> Remember that OSPF uses a wildcard mask so the valid masks are below
>>
>> 255
>> 127
>> 63
>> 31
>> 15
>> 7
>> 3
>> 1
>> 0
>>
>>
>>
>> ----Original Message Follows----
>> From: "Scott O'Donnell" <scotto@iworksys.com>
>>
>>
>> >
>>
>> Or the Network statement could look like this.
>>
>> network 172.16.254.1 0.0.0.252 area 0
>>
>> Although it doesn't lend itself to easy reading.
>>
>> Scott
>>
>>
>>
>> > Try a wildcard mask of 0.0.0.3
>> >
>> > Antonio
>> > ---------------------- Forwarded by Antonio Sabella/USC/AXE on
08/10/99
>> 10:36
>> > AM ---------------------------
>> >
>> > nobody@groupstudy.com on 08/10/99 10:05:23 AM
>> > To: jaarons@hotmail.com@internet@WTAXE,
>> > ccielab@groupstudy.com@internet@WTAXE
>> > cc:
>> > Subject: Re: OSPF network; inverse mask question....
>> >
>> > Your wild card mask is not including s0..
>> >
>> > ----Original Message Follows----
>> > From: "Jason Aarons" <jaarons@hotmail.com>
>> > Reply-To: "Jason Aarons" <jaarons@hotmail.com>
>> > To: ccielab@groupstudy.com
>> > Subject: OSPF network; inverse mask question....
>> > Date: Wed, 04 Aug 1999 18:14:37 EDT
>> >
>> > interface Serial0
>> > ip address 172.16.254.1 255.255.255.252
>> > encapsulation frame-relay
>> > ip ospf network point-to-point
>> > !
>> > router ospf 1999
>> > network 172.16.254.0 0.0.0.252 area 0
>> > !
>> > ip classless
>> > ip subnet-zero
>> >
>> > 1#show ip ospf int s0
>> > Serial0 is up, line protocol is up
>> > OSPF not enabled on this interface
>> >
>> > if I change the router ospf 1999, network 172.16.254.0 0.0.0.255 it
>> works.
>> > What am I not seeing ?
>> >
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