From: Brian Dennis (brian@xxxxxx)
Date: Wed Aug 07 2002 - 00:25:20 GMT-3
There must be another issue causing your problem because having the
subnet mask different will not stop them from pinging each other in this
case.
One thing to remember about PPP is even if the line is UP/UP it doesn't
mean that IP with flow across it. You must have IPCP (IP Control
Protocol) open before IP will work. If an interface with PPP
encapsulation is UP/UP but doesn't have an IP address configured when
the interface was first brought up, IPCP will not be negotiated. This
means that if you add an IP address to each side they will not be able
to ping each other until the interface is brought down and then back up
so IPCP can be negotiated and go into the open state.
Brian Dennis, CCIE #2210 (R&S/ISP Dial)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sam Dagoski
Sent: Tuesday, August 06, 2002 7:49 PM
To: Asim Khan; ccielab@groupstudy.com
Subject: Re: Funny Serial problem
Yea, but it does not work. I think PPP must exchange
network layer information.
Thanks everyone for all of your help!
--- Original Message ---
From: Asim Khan <asimmegawatt@yahoo.com>
To: Sam Dagoski <DAGOMEISTER@prodigy.net>,
ccielab@groupstudy.com
Subject: Re: Funny Serial problem
>Given your configuration, both routers will ping each
>other despite different netwrok masks. The reason is
>after ANDing the addresses with the netmasks, they
are
>on the same subnet i.e 200.20.1.128
>
>However if both addresses fall in different subnets
>then they can't ping each other.
>
>Regards.
>
>Asim Khan
>
>
>
>--- Sam Dagoski <DAGOMEISTER@prodigy.net> wrote:
>> How come this does not work:
>>
>> Router 1:
>> inter s0
>> ip address 200.20.1.129 255.255.255.240
>> encap ppp
>>
>> Router 2:
>> inter s0
>> ip address 200.20.1.130 255.255.255.224
>> encap ppp
>>
>> The masks are different. If the masks are
different
>>
>> on a serial connection, the two sides will not be
>> able to ping each other -- even thought the line
is
>> up and line protocol is up.
>>
>> Any ideas?
>>
>>
>-----------------------------------------------------
---- >> Sam Dagoski >> Priciple Engineer >>
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