[Fedora-xen] {Disarmed} Re: {Disarmed} Re: Dom0 running dhcpd and domU dhclient won't work on the same machine

[Roberto Fichera]

On 03/04/2011 06:47 PM, Jon Reynolds wrote:
> Are they on the same network or clan? Is the firewall or host.allow file blocking you or maybe selinux? Is it a
> windows machine trying to get the address or linux? Do you see anything in the logs or only in tcpdump?

My setup is:

firewall accepting udp traffic from 67:68 ports
selinux disabled
host.allow empty

tcpdump showing checksum errors

but just right now I solve my problem was the tx offload performed
by the network card

>
> Jon
>
>
> -----Original message-----
>
>     *From: *Roberto Fichera <kernel at tekno-soft.it>*
>     To: *Marko Ristola <marko.ristola at kolumbus.fi>*
>     Cc: *xen at lists.fedoraproject.org*
>     Sent: *Fri, Mar 4, 2011 17:39:06 GMT+00:00*
>     Subject: *Re: [Fedora-xen] Dom0 running dhcpd and domU dhclient won't work on the same machine
>
>     On 03/04/2011 05:17 PM, Marko Ristola wrote:
>     > 04.03.2011 14:16, Roberto Fichera kirjoitti:
>     >> Hi All,
>     >>
>     >> does anyone has the same problem on the same configuration?
>     >> Basically all the domU aren't able to get their ip address from the DHCPD
>     >> server running under the same dom0 with kernel *MailScanner warning: numerical links are often malicious:*
>     2.6.32.26-174.xendom0.fc12.x86_64.
>     >> I tried different domU kernels but it seems doesn't work at all.
>     >>
>     >> Any idea how to solve it?
>     >>
>     >> Thanks in advance.
>     >> Roberto Fichera.
>     >> --
>     >> xen mailing list
>     >> xen at lists.fedoraproject.org
>     >> https://admin.fedoraproject.org/mailman/listinfo/xen
>     > It should be solvable by configuring.
>     >
>     > I use bridge device br0, a remote dnsmasq server for DHCP and DNS. sysctl.conf is
>     > configured so that br0 works as expected: passes DHCP requests thrue.
>     >
>     > Your case is different than mine, so you need different configurations.
>     >
>     > Googling examples is a good start.
>     > You could try to use iptables LOG rules to track down problems.
>
>     I mean, it seems working because the dhcpd log shows that the requests
>     are coming from the domU but the domU doesn't get the DHCPD answare.
>
>     I also read about setting off ethernet tx offload under dom0 via "ethtool -K eth0 tx off"
>     but it seems not helping to solve anything, at least in my case.
>
>     Which kind of configuration you made in your side?
>
>     > Regards,
>     > Marko Ristola
>     >
>     > --
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>     > xen at lists.fedoraproject.org
>     > https://admin.fedoraproject.org/mailman/listinfo/xen
>     >
>
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>

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