Re: [SLE] HowTo connect dhcpd and dhcp-client

From: Ulrich Leopold (uleopold_at_science.uva.nl)
Date: 06/07/04

  • Next message: Ulrich Leopold: "Re: [SLE] HowTo connect dhcpd and dhcp-client" 
    To: SuSE Linux EN <suse-linux-e@suse.com>
Date: 07 Jun 2004 11:26:35 +0200

    On Mon, 2004-06-07 at 09:59, Leendert Meyer wrote:
    > On Monday 07 June 2004 08:29, Ulrich Leopold wrote:
    > > On Mon, 2004-06-07 at 03:03, Leendert Meyer wrote:
    > > > On Sunday 06 June 2004 15:37, Ulrich Leopold wrote:
    > > > > I managed to get a connection between dhcp-server and dhcp-client. But
    > > > > I do not manage to get an internet connection for the client. eth1 is
    > > > > the dhcp-server where as eth0 gets the internet connection from the ISP
    > > > > as dhcp-client.
    > > > >
    > > > > Here is my dchp-dump output from the server for eth1.
    > > > >
    > > > > The client gets ip# 192.168.0.20 and netmask 255.255.255.0.
    > > >
    > > > No, ;) the dhcp server sends a reply with those data. The question is if
    > > > that package is received by the client. dhcp-dump on the client would
    > > > reveil that.
    > >
    > > The dhcp-dump for the client never showed anything.
    >
    > Sorry, my question was stupid. dhcp-dump does not run when the network is
    > down. ;)
    >
    > > > BTW, can you setup a static ip# on the client?
    >
    > > When I log in from the client on the server via ssh it works with a
    > > static ip#. But nothing else.
    >
    > Not even ping? Ping host -> client, ping client -> host?

    ping works in both ways.

    > > Do I have to configure the firewalls on both machines differently for dhcp?
    >
    > Perhaps turn the firewalls of during testing. If all works well, you can turn
    > them on. If consequently something breaks, you know it's the firewall. ;) You
    > probably need the firewall later to reach the WWW, because of its
    > masquerading/NATting.
    nothing changes with firewall off. Pinging works but (of course ?) no internet connection because of ip forwarding.
    But also without ip forwarding it oes not work.

    > > On the server it does IP forwarding and masquerading and allows ssh and
    >
    > As your dhcp server also serves as a router, you have to turn on IP forwarding
    > in /etc/sysconfig/sysctl:
    > IP_FORWARD="yes"
    is turned on

    > cat /proc/sys/net/ipv4/ip_forward should output a single '1'. If not, set it
    > manually with:

    returns '1'

    > echo '1' > /proc/sys/net/ipv4/ip_forward

    > If you have put the firewall down on the host, then check this.
    >
    > > On the client I use the setings I always use to get internet
    > > connections. It's a laptop and has been connected to various networks
    > > with this configuration. So I guess I still make a mistake on the
    > > server, right?
    >
    > AFAICS: Right.
    >
    > Well, that is, unless you hand out your ip# conditionally, in which case the
    > client has to fullfill a certain condition (e.g. send a client-id). But you
    > hand them out unconditionally, so no worries about that.
    Now I do not know what is wrong?

    Ping works with static address and dynamic address. ssh works also with
    both. Internet connection does not work. Do I have to configure tcp/ip
    transfer on the dhcp-server in a special way? Maybe the router
    configuration is wrong? If I turn off firewall what else should I turn
    off? IP forwarding on router?

    So basically the internet connection is not working.

    > BTW, no need to CC me, I'm on the list. ;)
    sorry, was too sleepy this morning. Realised too late when I had hit the send already.
    ;-).

    Cheers, Ulrich 

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