From: Volkov, Dmitry (IDS Canada) (dmitry_volkov@ca.ml.com)
Date: Sat Jun 21 2003 - 16:14:07 GMT-3
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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