From: KC (kanwal.chawla@gmail.com)
Date: Sun Mar 05 2006 - 01:35:22 GMT-3
Hi All
Well i believe, u should never use Dynamic mapping, its better to use Manual
mapping of DLCI. If you cant ping ur own IP , there is one solution :-
1. whenever u configure Manual mapping, u always give, (frame-relay map ip
<next hop ip> <local DLCI> broadcast)
2. if u wanna ping ur self, then run this command also ( frame-relay map ip
<local ip> <local DLCI> broadcast)
You would be able to ping urself.
Regards
KC
On 3/4/06, Brian Dennis <bdennis@internetworkexpert.com> wrote:
>
> Joe,
> By default you can not ping your own virtual-template
> interface's IP address. Do not worry about this behavior in the real
> lab unless the lab specifically asks you to be able to ping your own
> interfaces. You will not fail a full reachability test because of
> something like this.
>
> Note that when pinging yourself over a WAN link (HDLC, Frame
> Relay, etc) the ICMP echo is sent out the interface that the IP address
> is applied. The router on the remote end then routes the ICMP echo back
> to the router that originated the ping. Then the originating route
> replies to the ICMP echo and sends an ICMP echo-reply out the interface.
> The remote router then turns around and sends the ICMP echo-reply right
> back. This is the reason pinging your own interface takes roughly twice
> as long over pinging the remote end's interface. Also pinging yourself
> doesn't have many uses in the real world.
>
> As you can see below ping yourself takes roughly twice as long
> as pinging the remote end.
>
> Rack1R4#sho ip int brief
> Interface IP-Address OK? Method Status
> Protocol
> Serial0/1 145.1.45.4 YES manual up up
>
> Rack1R4#ping 145.1.45.4
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 145.1.45.4, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 56/57/60 ms
> Rack1R4#ping 145.1.45.5
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 145.1.45.5, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 28/30/32 ms
> Rack1R4#
>
>
> HTH,
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Joe Gagznos
> Sent: Saturday, March 04, 2006 5:19 PM
> To: 'Group Study (E-mail)'
> Subject: Frame Relay & Virtual Templates
>
> I am working on a lab where I am asked to configure ppp over frame relay
> - a
> seemingly simple task.
>
>
>
> The issue I have is that I am unable to ping the local IP configured
> under
> the virtual template of each router. I have configured no
> authentication
> because I need to see proper ip connectivity before I add extra layers
> of
> complexity to the requirement later on.
>
>
>
> My concern is that if I can't ping the local IP, then I will have an
> issue
> when it comes time to grade for "full IP reachability".
>
>
>
> Here are the pertinent configurations for each router named R1 & R2.
>
>
>
> R1
>
> interface Serial0/0
>
> no ip address
>
> encapsulation frame-relay
>
> frame-relay interface-dlci 102 ppp Virtual-Template1
>
> no frame-relay inverse-arp
>
>
>
> interface Virtual-Template1
>
> ip address 163.1.12.1 255.255.255.0
>
>
>
> R2
>
> interface Serial0
>
> no ip address
>
> encapsulation frame-relay
>
> frame-relay interface-dlci 201 ppp Virtual-Template1
>
> no frame-relay inverse-arp
>
>
>
> interface Virtual-Template1
>
> ip address 163.1.12.2 255.255.255.0
>
>
>
> ----------------------------------------------------------------------
>
> R1#ping 163.1.12.2
>
>
>
> Type escape sequence to abort.
>
> Sending 5, 100-byte ICMP Echos to 163.1.12.2, timeout is 2 seconds:
>
> !!!!!
>
> Success rate is 100 percent (5/5), round-trip min/avg/max = 4/7/8 ms
>
> -----------------------------------------------------------------------
>
> R1#ping 163.1.12.1
>
>
>
> Type escape sequence to abort.
>
> Sending 5, 100-byte ICMP Echos to 163.1.12.1, timeout is 2 seconds:
>
> .....
>
> Success rate is 0 percent (0/5)
>
> ------------------------------------------------------------------------
>
> R2#ping 163.1.12.1
>
>
>
> Type escape sequence to abort.
>
> Sending 5, 100-byte ICMP Echos to 163.1.12.1, timeout is 2 seconds:
>
> !!!!!
>
> Success rate is 100 percent (5/5), round-trip min/avg/max = 8/8/8 ms
>
> ------------------------------------------------------------------------
> -
>
> R2#ping 163.1.12.2
>
>
>
> Type escape sequence to abort.
>
> Sending 5, 100-byte ICMP Echos to 163.1.12.2, timeout is 2 seconds:
>
> .....
>
> Success rate is 0 percent (0/5)
>
>
>
> What am I doing wrong?
>
>
>
> Thanks,
>
> Joe Gagznos
>
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