From: robbie (robbie@packetized.org)
Date: Sat Mar 12 2005 - 20:31:37 GMT-3
(top posting against my better judgement, due to length)
So, you're trying to ping the broadcast address on a non-broadcast
media, and getting no results?
I always thought that this would not work because it's NB style media
(as denoted by the int atm0/0.208 point-to-point) despite what subnet
you had configured. Anyone?
robbie
ccie2be wrote:
> Hi guys,
>
>
>
> I don't get this. Maybe someone can fill me in.
>
>
>
> There are a couple of strange things happening.
>
>
>
> Notice in the debug output below, when I ping the broadcast address, the
> debug shows dest address as 255.255.255.255
>
>
>
> not 54.8.7.255 which is the address I actually pinged. Also, notice that
> ping's to 54.8.7.254 work fine.
>
>
>
> So, I have 2 questions:
>
>
>
> Why is the router changing the broadcast address I'm pinging?
>
>
>
> And, why isn't the ping to the bcast address working?
>
>
>
> Also, notice that the config does include the broadcast keyword which I so
> often forget.
>
>
>
> Here's the config:
>
>
>
> interface Loopback0
>
> ip address 54.8.7.6 255.255.255.0
>
> !
>
> interface ATM0/0
>
> no ip address
>
> no ip route-cache cef
>
> no atm ilmi-keepalive
>
> !
>
> interface ATM0/0.208 point-to-point
>
> pvc 0/208
>
> broadcast
>
> encapsulation aal5snap
>
> protocol ppp Virtual-Template1
>
> !
>
> interface Virtual-Template1
>
> ip unnumbered Loopback0
>
> ppp chap hostname ROUTER6
>
> ppp chap password 0 CISCO
>
>
>
>
>
> R6#p 54.8.7.254
>
>
>
> Type escape sequence to abort.
>
> Sending 5, 100-byte ICMP Echos to 54.8.7.254, timeout is 2 seconds:
>
> !!!!!
>
> Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
>
>
>
> R6#p 54.8.7.255
>
>
>
> Type escape sequence to abort.
>
> Sending 5, 100-byte ICMP Echos to 54.8.7.255, timeout is 2 seconds:
>
> .....
>
>
>
> *Feb 10 21:27:58.687: IP: s=54.8.7.6 (Loopback0), d=255.255.255.255, len
> 100, un
>
> routable
>
> *Feb 10 21:27:59.735: IP: s=54.8.7.254 (Virtual-Access1), d=224.0.0.10, len
> 60,
>
> unroutable
>
> *Feb 10 21:28:00.687: IP: s=54.8.7.6 (local), d=255.255.255.255 (Loopback0),
> len
>
> 100, sending broad/multicast
>
> *Feb 10 21:28:00.687: IP: s=54.8.7.6 (Loopback0), d=255.255.255.255, len
> 100, un
>
> routable
>
> *Feb 10 21:28:02.687: IP: s=54.8.7.6 (local), d=255.255.255.255 (Loopback0),
> len
>
> 100, sending broad/multicast
>
> *Feb 10 21:28:02.687: IP: s=54.8.7.6 (Loopback0), d=255.255.255.255, len
> 100, un
>
> routable
>
> *Feb 10 21:28:04.687: IP: s=54.8.7.6 (local), d=255.255.255.255 (Loopback0),
> len
>
> 100, sending broad/multicast
>
> *Feb 10 21:28:04.687: IP: s=54.8.7.6 (Loopback0), d=255.255.255.255, len
> 100, un
>
> routable
>
>
>
> TIA, Tim
>
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