From: Wayne Lewis (lewisway@xxxxxxxxxxxxxx)
Date: Tue Nov 27 2001 - 23:59:26 GMT-3
Easier - do an extended ping and choose the record route option.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Brian Hescock
Sent: Tuesday, November 27, 2001 4:42 PM
To: PimpDaddy
Cc: ccielab@groupstudy.com
Subject: Re: lab 16 asymetrical routing verification
You can use an access-list for testing instead of debugs or a sniffer in a
lot
of situations (i.e. not many people have wan sniffers)
access-list 100 permit ip host a.b.c.d host e.f.g.h
access-list 100 permit ip any any
access-list 101 permit ip host a.b.c.d host e.f.g.h
access-list 101 permit ip any any
where a.b.c.d is the ping destination and e.f.g.h is the ping source (this
is
the echo reply so they're in the reverse order)
apply one access-list to each of the outbound interfaces (back toward the
ping
source). Ping from the pc and once the ping test stops, do "show
access-list" and look at the number of matches in the first line of both
access-lists, that's the number of packets that used that path. However,
you
would need to ping something behind this router because if you ping the
router
itself, outbound access-lists aren't applied to packets generated by the
router itself (the echo replies). Or just put the access-list on an
inbound
interface on the next-hop router.
But if all you're checking is which path is being used (not testing
load-sharing) and no requirement to use access-lists, Pimp's solution is
much
quicker and easier.
Brian
PimpDaddy wrote:
> filter out icmp echo reply on the router on which the ping packet left.
if
> you get an echo reply on your machine, you know it came on the alternative
> path, hence asymmetrical routing.
>
> HTH,
> Steve
>
> > This may be a dumb question but how do you verify asymetrical routing
> > using an access-list ? Lab 16 requests to have pings travel over the
> > frame network to reach r4 and the reurn path should be across a
> > point-point connection. How can I check this operation ? The hints
> > indicate that you can verify by using an access-list...
> >
> > Anyone who has done this before, your input would be greatly
> > appreciated !
> >
> > Thanks
> > unsubscribe from the CCIELAB list, send a message to
> > majordomo@groupstudy.com with the body containing:
> > unsubscribe ccielab
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