[CentOS] Problem with DHCP and default route in CentOS

SilverTip257 silvertip257 at gmail.com
Wed Aug 21 23:34:41 UTC 2013


On Wed, Aug 21, 2013 at 5:48 PM, Joshua J. Kugler <joshua at azariah.com>wrote:

> I have a CentOS 6.4 VM that is getting its DHCP information from dnsmasq (a
> libvirt instance). However, it is not applying the routing information.
> Attached is a tcpdump of the dhcpc output. You'll see:
>
>             Default-Gateway Option 3, length 4: 192.168.122.1
>
> However, when I run 'route -n', I get:
>
> # route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> 192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0
> eth0
> 169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0
> eth0
>
> Any ideas as to why the default route/gateway information isn't being
> applied?
>

This sure sounds like a bug I discovered on my own 6.4 KVM node
configuration.

The following added to /etc/dnsmasq.conf remedied a dnsmasq+pxe problem for
me (back in May 2013).

#  ref: https://bugzilla.redhat.com/show_bug.cgi?id=594682#c6
#  ref: http://etherboot.org/wiki/dnsmasq#a_potential_problem_and_a_fix
dhcp-no-override


>
> j
>
>
> --
> Joshua J. Kugler - Fairbanks, Alaska
> Azariah Enterprises - Programming and Website Design
> joshua at azariah.com - Jabber: pedahzur at gmail.com
> PGP Key: http://pgp.mit.edu/  ID 0x73B13B6A
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>
>


-- 
---~~.~~---
Mike
//  SilverTip257  //



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