Cable modem & DHCP

[Bob Hall]

On Sun, May 18, 2003 at 09:42:30AM -0400, JoeB wrote:
> Are you using a crossover cable between the cable modem and your
> FBSD box?

Yes. The ethernet light comes on when both the modem and the computer 
are running. That means that there's a connection at the link layer, so 
the cable should be good. The light does not come on when I use a 
"straight through" cable. 

Additional info:
$ less dhclient.leases
lease {
   <some info deleted>
  renew 4 2003/5/15 10:59:57;
  rebind 5 2003/5/16 13:59:57;
  expire 5 2003/5/16 22:59:57;
}

The lease seems to have expired and dhclient hasn't updated it.
I thought maybe the "default to deny" firewall might be stopping 
dhclient from querying the DHCP server, so I compiled a 
default-to-allow kernel as a test, but that didn't help. At some 
point, dhclient was working, but I was wrapped up in another 
problem and didn't notice, and I haven't been able to get it to 
update the lease since. I did check to make sure that dhclient is 
binding to port 68.
 
> -----Original Message-----
> From: owner-freebsd-questions at freebsd.org
> [mailto:owner-freebsd-questions at freebsd.org]On Behalf Of Bob Hall
> Sent: Sunday, May 18, 2003 1:28 AM
> To: freebsd-questions at freebsd.org
> Subject: Cable modem & DHCP
> 
> I'm trying to connect a FBSD box to a cable modem. I'm getting
> the following message at startup immediately after the dmesg lines
> relating to rlphy0:
>         ifconfig: ioctl (SIOCDIFADDR): Can't assign requested
> address.
> 
> I assume that refers to
>         ifconfig_rl0="DHCP"
> but I have no idea how to fix it so that the address gets assigned.
> The FBSD box is the gateway for my LAN, and I normally run NAT and
> an ipfw firewall w/ tcp.blackhole and udp.blackhole set to 2, but
> I've disabled NAT and the firewall and reset blackhole to 0 for both
> protocols while I try to set up the cable modem. Can anyone tell me
> how to assign the requested address?
> 
> configuration info:
> $ uname -a
> FreeBSD sten.alder.net 4.4-RELEASE FreeBSD 4.4-RELEASE #0: Sat Dec
> 7 18:48:43 E
> ST 2002     root at sten.alder.net:/usr/src/sys/compile/STEN2  i386
> 
> $ less rc.conf
> hostname="sten.alder.net"
> inetd_enable="YES"
> 
> network_interfaces="rl0 lo0"
> ifconfig_rl0="DHCP"
> ifconfig_lo0="inet 127.0.0.1"
> 
> kern_securelevel_enable="NO"
> firewall_enable="NO"
> 
> named_enable="YES"
> named_flags="-b /etc/namedb/named.conf"
> 
> portmap_enable="YES"
> 
> $ ifconfig rl0
> rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 0.0.0.0 netmask 0xff000000 broadcast 255.255.255.255
>         ether 00:40:05:80:44:4b
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
> 
> $ netstat -r
> Routing tables
> Internet:
> Destination        Gateway            Flags    Refs      Use  Netif
> Expire
> 0                  link#4             UC          1        0    rl0
> =>
> default            192.168.0.1        UGSc       26        3    rl0
> 0.255.255.255      ff:ff:ff:ff:ff:ff  UHLWb       3        9    rl0
> localhost          localhost          UH          0        2    lo0
> 
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