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From: Jim on 20 Feb 2010 04:34
This is probably not actualy a FreeBSD issue, but I'd appreciate some
ideas.

I've got a FreeBSD 6.2 box with two ethernet cards in it - dc0 and re0.
The machine basically acts as my internet gateway and does mail, news,
firewalling, that sort of thing.

re0 has a static ip address of 192.168.1.1 and is the NIC for the
internal network (mostly Macs).

dc0 gets its IP address via DHCP from a BT Business Hub 2700HGV ADSL
router.

Here's where it starts to get a bt strange...

The Business Hub is set to issue DHCP in the range 192.168.2.2 to
192.168.2.10 - in fact there will only be a single device connected to
it. The router itself is at 192.168.2.1

However, when the FreeBSD machine gets its IP, it's getting the WAN IP
address (212.159.71.78) and not 192.168.2.2 as I would expect.

/etc/rc.conf has the line

ifconfig_dc0="DHCP"

and that's the only reference to dc0.

If I connect another machine (an OS X PowerBook) and get an address via
DHCP I get a 192.168.2.x address as expected.

Now, I know I could just give dc0 a static IP but I run the 2700 in DMZ
as it gives me a lot more flexibility if I do all the firewalling via
FreeBSD, and the 2700 will only DMZ to a machine that gets its IP via
DHCP...kind of odd but that's BT for you.

Any ideas?

Jim
--
"Microsoft admitted its Vista operating system was a 'less good
product' in what IT experts have described as the most ambitious
understatement since the captain of the Titanic reported some
slightly damp tablecloths." http://www.thedailymash.co.uk/
From: Jim on 20 Feb 2010 04:40
Jim <jim(a)magrathea.plus.com> wrote:

<snip>

Output from ifconfig:

[jim(a)wotan] ~ >ifconfig
dc0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=8<VLAN_MTU>
inet 212.159.71.78 netmask 0xfffffffc broadcast 212.159.71.79
ether 00:30:05:52:1b:d5
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=1b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING>
inet 192.168.1.1 netmask 0xffffff00 broadcast 192.168.1.255
ether 00:06:4f:68:5b:32
media: Ethernet autoselect (1000baseTX <full-duplex>)
status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
inet6 ::1 prefixlen 128
inet 127.0.0.1 netmask 0xff000000



and rc.conf in full:

[jim(a)wotan] ~ >cat /etc/rc.conf

# -- sysinstall generated deltas -- # Fri Feb 9 17:34:51 2007
# Created: Fri Feb 9 17:34:51 2007
# Enable network daemons for user convenience.
# Please make all changes to this file, not to /etc/defaults/rc.conf.
# This file now contains just the overrides from /etc/defaults/rc.conf.

gateway_enable="YES"
keymap="uk.iso"

update_motd="NO"
inetd_enable="YES"
linux_enable="YES"
moused_enable="YES"
sshd_enable="YES"
usbd_enable="YES"
local_startup="/usr/local/etc/rc.d"
proftpd_enable="YES"
samba_enable="YES"
apache22_enable="YES"
dovecot_enable="YES"

# configure Network Address Translation
natd_enable="YES"
natd_interface="dc0"
natd_flags="-m -f /etc/natd.conf"

# Enable and confirgure the Postfix mail system
postfix_enable="YES"
sendmail_enable="NO"
sendmail_submit_enable="NO"
sendmail_outbound_enable="NO"
sendmail_msp_queue_enable="NO"

# Enable and configure the firewall
firewall_enable="YES"
firewall_script="/etc/fwrules"

ipmon_enable="YES"
ipmon_flags="-Ds"

# Configure network interfaces
defaultrouter="192.168.2.1"
ifconfig_re0="inet 192.168.1.1 netmask 255.255.255.0"
hostname="wotan.magrathea.local"

named_enable="YES"
arpproxy_all="YES"

# -- sysinstall generated deltas -- # Thu Feb 18 20:29:49 2010
ifconfig_dc0="DHCP"
hostname="wotan.magrathea.local"



Jim

--
"Microsoft admitted its Vista operating system was a 'less good
product' in what IT experts have described as the most ambitious
understatement since the captain of the Titanic reported some
slightly damp tablecloths." http://www.thedailymash.co.uk/
From: Jim on 20 Feb 2010 04:57
Jim <jim(a)magrathea.plus.com> wrote:

<snip>

Never mind, foud it - the router was passing on the DHCP request to the
upstream provider. Turn out you can toggle that.

Jim
--
"Microsoft admitted its Vista operating system was a 'less good
product' in what IT experts have described as the most ambitious
understatement since the captain of the Titanic reported some
slightly damp tablecloths." http://www.thedailymash.co.uk/
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