From: Jonathan V Hays (jhays@jtan.com)
Date: Sat Jun 21 2003 - 18:22:10 GMT-3
I have to correct myself here - for some crazy reason I was thinking
that fast switching is off by default on ethernet interfaces. Indeed,
that may have been the problem.
Thanks!!
Jonathan
> -----Original Message-----
> From: Jonathan V Hays [mailto:jhays@jtan.com]
> Sent: Saturday, June 21, 2003 5:17 PM
> To: 'Volkov, Dmitry (IDS Canada)'; 'ccielab@groupstudy.com'
> Cc: 'wing_lam@jossynergy.com'
> Subject: RE: helper address
>
>
> I did disable fast-switching on the serial interfaces. But
> the fast switching issue does not explain why debug did not
> see ethernet segment broadcasts that my PC sniffer did, when
> plugged into the same hub (not a switch).
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of Volkov, Dmitry (IDS Canada)
> > Sent: Saturday, June 21, 2003 3:14 PM
> > To: 'Jonathan V Hays'; ccielab@groupstudy.com
> > Cc: wing_lam@jossynergy.com
> > Subject: RE: helper address
> >
> >
> > Did You disable fast switching ?
> > http://www.cisco.com/en/US/tech/tk801/tk379/technologies_tech_
> > note09186a0080
> > 17874c.shtml#debugippacket
> >
> > > -----Original Message-----
> > > From: Jonathan V Hays [mailto:jhays@jtan.com]
> > > Sent: Saturday, June 21, 2003 2:07 PM
> > > To: ccielab@groupstudy.com
> > > Cc: wing_lam@jossynergy.com
> > > Subject: RE: helper address
> > >
> > >
> > > Hi,
> > >
> > > You are right that "debug ip packet detail" seems a bit
> > flaky in this
> > > instance.
> > >
> > > I spent some time experimenting with "ip helper-address" myself,
> > > generating DHCP Discover messages to be forwarded by the
> router to a
> > > remote server. Not only did I not see the packets on the
> > > remote segment,
> > > "debug ip packet detail" does not always see the DHCP Discover
> > > broadcasts from the client on the LOCAL segment, even when my
> > > PC sniffer
> > > sees them. Hmmm. Strange ....
> > >
> > > Jonathan
> > >
> > > > -----Original Message-----
> > > > From: wing_lam@jossynergy.com [mailto:wing_lam@jossynergy.com]
> > > > Sent: Monday, June 23, 2003 11:15 AM
> > > > To: Jonathan V Hays
> > > > Cc: ccielab@groupstudy.com
> > > > Subject: RE: helper address
> > > >
> > > >
> > > >
> > > > Hi Jonathan,
> > > >
> > > > I am generating UDP broadcast by port 2000 traffic in
> > > > 192.168.1.0/24 subnet
> > > > and I have used helper address and forward-protocol in
> the router:
> > > >
> > > > Host broadcast --> 192.168.1.1 router -- ATM p-to-p--
> > > > 192.168.2.4 router
> > > >
> > > > My comand is ip helper-address 192.168.2.4 & ip
> > > > forward-protocol udp 2000
> > > >
> > > > But when I "debug ip packet detail" in the 192.168.2.4
> > > > router, I haven't
> > > > see any packet comes.
> > > >
> > > > Should I able to see these helpered packets in 192.168.2.4
> > > > router? or it's
> > > > normal that I cannot see them?
> > > >
> > > > The following is my interface config
> > > >
> > > > interface FastEthernet0/0
> > > > ip address 192.168.1.1 255.255.255.0
> > > > ip helper-address 192.168.2.4
> > > > ip directed-broadcast
> > > > ip router isis DOG
> > > > ip pim dr-priority 100
> > > >
> > > > Thx,
> > > > BBD (Big Black Dog)
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > "Jonathan V Hays"
> > > >
> > > >
> > > > <jhays@jtan.com> To:
> > > > <ccielab@groupstudy.com>
> > > >
> > > > cc:
> > > > <wing_lam@jossynergy.com>
> > > >
> > > > 06/21/2003 11:05 Subject: RE:
> > > > helper address
> > > >
> > > > PM
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > > > > Behalf Of wing_lam@jossynergy.com
> > > > > Sent: Monday, June 23, 2003 5:23 AM
> > > > > To: ccielab@groupstudy.com
> > > > > Subject: helper address
> > > > >
> > > > >
> > > > > Hi, Group;
> > > > >
> > > > > I would like to test the "ip helper" address function. I
> > > > > generate a subnet
> > > > > broadcast in a interface and using helper address to redircet
> > > > > this subnet
> > > > > broadcast to another host, but no matter I do what debugging,
> > > > > I cannot see
> > > > > packet go to the host; anybody please suggest a testing
> > > > > method on whether
> > > > > the helper address config is success.
> > > >
> > > >
> > > > Please be more specific. Given the sketchy information you
> > > > have provided
> > > > we would have to do a LOT of guessing to figure out what you
> > > > are doing.
> > > >
> > > > 1. Post your config.
> > > >
> > > > 2. Describe the topology.
> > > >
> > > > 3. Describe exactly what you are doing to test. How are you
> > > generating
> > > > the broadcast? On what machine? Another router? What kind
> > > of broadcast
> > > > are you generating? What debug command are you using and
> > > where are you
> > > > using it?
> > > >
> > > > Note that the "ip helper-address" forwards specific
> > > broadcasts for the
> > > > eight UDP destination ports below:
> > > >
> > > > 37 time server
> > > > 49 TACACS
> > > > 53 DNS
> > > > 67 BOOTP/DHCP Server
> > > > 68 BOOTP/DHCP Client
> > > > 69 TFTP
> > > > 137 NETBIOS Name Service
> > > > 138 NETBIOS Datagram Service
> > > >
> > > > So if you are testing the helper-address command you
> will have to
> > > > generate one of those types of broadcasts.
> > > >
> > > http://www.cisco.com/univercd/cc/td/doc/product/software/ios12
> > > 2/122cgcr/
> > > fipras_r/1rfipadr.htm#1018608
> > >
> > > HTH
> > >
> > >
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