[j-nsp] dhcp-relay on MX

[Marlon Duksa]

This counter is incrementing:

Due to no valid local address: 1               -   when I run 'show helper
statisctics'

aadmin at mx-re0# run show helper statistics
bootps:
  Received packets: 1
  Forwarded packets: 0
  Dropped packets: 1
    Due to no interface in fud database: 0
    Due to no matching routing instance: 0
    Due to an error during packet read: 0
    Due to an error during packet send: 0
    Due to invalid server address: 0
    Due to no valid local address: 1
    Due to no route to server/client: 0

For some reason, DHCP Discovers are not forwarded to the DHCP. I have
Wireshark installed on both links (client side and the server side) and I
see packets coming from the client but nothing going out to the server.



On Wed, Sep 17, 2008 at 2:15 PM, Masood Ahmad Shah <masood at nexlinx.net.pk>wrote:

> What you get when you do ---- show helper statistics
> You can also use some packet capturing applications like ethereal on DHCP
> server; just to check the packets are being forward to DHCP server or not.
>
> If you need include the maximum-hop-count statement, deault value is 4
> hops.
> set the routing instance of the server to forward if different, include the
> routing-instance statement.
>
> Regards,
> Masood
>
> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Marlon Duksa
> Sent: Wednesday, September 17, 2008 11:01 PM
> To: Nicolaj Kamensek
> Cc: juniper-nsp at puck.nether.net
> Subject: Re: [j-nsp] dhcp-relay on MX
>
> Still no luck. This is what I have. Also there is no firewall in this
> network.
> forwarding-options {
>    helpers {
>        bootp {
>            server 10.0.0.100;
>            relay-agent-option;
>        }
>    }
> }
>
> interfaces {       <-------client side
>    ge-0/0/0 {
>        unit 0 {
>            family inet {
>                unnumbered-address lo0.0 preferred-source-address 1.1.1.1;
>            }
>        }
>    }
>
> On Wed, Sep 17, 2008 at 4:23 AM, Nicolaj Kamensek <nk at accelerated.de>
> wrote:
>
> > Marlon Duksa schrieb:
> >
> >> HiDoes anyone know why DHCP discover packets are not relayed through an
> MX
> >> from my client to en external DHCP server that resides on the same
> network
> >> as one on the interfaces on MX (I can ping this DHCP server from the
> MX).
> >>
> >
> > Keep in mind that dhcp-relay is done via the routing-engine, so your RE
> > firewall filter might be the reason. You need to allow dhcp/bootp packets
> > there.
> >
> > Regards
> >
> >
> > --
> > Accelerated IT Services GmbH
> > Schubertstrasse 10                        D-67251 Freinsheim
> > nk at accelerated.de                         http://www.accelerated.de/
> > Telefon: +49 69-25738580-3                Telefax: +49 69-25738580-4
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> >
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