Anyone using Arris Cornerstone 1000?: msg#00361 network.dhcp.isc.dhcp-server

*** From dhcp-server -- To unsubscribe, see the end of this message. ***

Hi all,

I'm the sysadmin for small cable company. I've set up many cable modem
POP's, all work flawlessly using ISC DHCPd. However, this is my first
Layer 2/Bridging CMTS, and I'm having a hell of a time making it work.
Here's a quick diagram of what I want:

CPE --------- CM -------------- CMTS ------ Switch ----- DHCP
1.2.3.5 10.90.0.5 1.2.3.4 | 1.2.3.2
| 10.90.0.1
|
|
Router 1.2.3.1
|
|
Internet

There is a setting in the CMTS that sets up different bootp relay
destinations based on cable modem or computer. Output:
[forsythcmts] admin# show bootp-list

Level to be displayed is 'bootp-list'.

BOOTP relay table

Index Status IP Address Client Types Relay Count
----- ---------- --------------- ------------- -----------
1 active 10.90.0.1 cm-only 143
2 active 1.2.3.2 cpe-only 0
3 not-in-svc 255.255.255.255 any-cm-or-cpe 0
4 not-in-svc 255.255.255.255 any-cm-or-cpe 0
5 not-in-svc 255.255.255.255 any-cm-or-cpe 0
6 not-in-svc 255.255.255.255 any-cm-or-cpe 0
7 not-in-svc 255.255.255.255 any-cm-or-cpe 0
8 not-in-svc 255.255.255.255 any-cm-or-cpe 0
9 not-in-svc 255.255.255.255 any-cm-or-cpe 0
10 not-in-svc 255.255.255.255 any-cm-or-cpe 0
End of list

I assigned 2 addresses to the Linux box, one globally routable, one
private network.

[root@localhost network-scripts]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:02:B3:C5:67:7A
inet addr:1.2.3.2 Bcast:xxx.xxx.xxx.xxx Mask:255.255.255.192
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:6150 errors:0 dropped:0 overruns:0 frame:0
TX packets:4389 errors:0 dropped:0 overruns:0 carrier:0
collisions:105 txqueuelen:100
RX bytes:1143905 (1.0 Mb) TX bytes:993167 (969.8 Kb)
Interrupt:5 Base address:0x6000

eth0:0 Link encap:Ethernet HWaddr 00:02:B3:C5:67:7A
inet addr:10.90.0.1 Bcast:xxx.xxx.xxx.xxx Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:5 Base address:0x6000

I assumed that the dhcp server would see the destination IP, and assign
a subnet related to that, but it appears as though it's looking at the
gateway. My dhcpd.conf:

authoritative;
default-lease-time 345600; #4 day lease
max-lease-time 691200; #8 day lease

subnet 1.2.3.0 netmask 255.255.255.192 { #CPE Network
default-lease-time 14400; # 4 hour lease on non-static IP's
max-lease-time 28800; # 8 hour max lease
filename "noaccess.cm";
range xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx;
option subnet-mask 255.255.255.192;
option routers 1.2.3.1;
} # CPE Network
} # end CPE Shared Network

# This is the CM network
subnet 10.90.0.0 netmask 255.255.0.0 {
range 10.90.0.5 10.90.255.254;
option subnet-mask 255.255.0.0;
option broadcast-address 10.90.255.255;
filename "noaccess.cm";
option tftp-server-name "x.x.x.35";
option time-servers x.x.x.35; }

tcpdump shows that the destination changes, but source stays the same.
If I could assign ip aliases to this CMTS, I'm sure that I could make it
work. It's working, it's just that I don't want my cable modems sitting
on routable IP's. Anyone have any idea's? My tcpdump is below:

Justin

[root@localhost root]# tcpdump udp port 67
tcpdump: listening on eth0
15:38:16.323002 1.2.3.4.bootpc > 10.90.0.1.bootps: hops:1
xid:0xdfad0501 G:1.2.3.4 ether 0:10:95:5:ad:df [|bootp]
15:38:16.324606 1.2.3.4.bootpc > 10.90.0.1.bootps: hops:1
xid:0xdfad0501 G:1.2.3.4 ether 0:10:95:5:ad:df [|bootp]
15:38:17.325441 1.2.3.2.bootps > 1.2.3.4.bootps: (reply) hops:1
xid:0xdfad0501 Y:216.187.180.66 S:1.2.3.2 G:1.2.3.4 ether
0:10:95:5:ad:df [|bootp] (DF)
15:38:17.430170 1.2.3.4.bootpc > 10.90.0.1.bootps: hops:1
xid:0xdfad0501 G:1.2.3.4 ether 0:10:95:5:ad:df [|bootp]
15:38:17.431790 1.2.3.4.bootpc > 10.90.0.1.bootps: hops:1
xid:0xdfad0501 G:1.2.3.4 ether 0:10:95:5:ad:df [|bootp]
15:38:17.435296 1.2.3.2.bootps > 1.2.3.4.bootps: (reply) hops:1
xid:0xdfad0501 Y:216.187.180.66 S:1.2.3.2 G:1.2.3.4 ether
0:10:95:5:ad:df [|bootp] (DF)
15:39:34.328641 1.2.3.4.bootpc > 10.90.0.1.bootps: hops:1
xid:0xdfad0501 G:1.2.3.4 ether 0:10:95:5:ad:df [|bootp]
15:39:34.330291 1.2.3.4.bootpc > 10.90.0.1.bootps: hops:1
xid:0xdfad0501 G:1.2.3.4 ether 0:10:95:5:ad:df [|bootp]
15:39:35.325407 1.2.3.2.bootps > 1.2.3.4.bootps: (reply) hops:1
xid:0xdfad0501 Y:xxx.xxx.xxx.xxx S:1.2.3.2 G:1.2.3.4 ether
0:10:95:5:ad:df [|bootp] (DF)
15:39:35.427516 1.2.3.4.bootpc > 10.90.0.1.bootps: hops:1
xid:0xdfad0501 G:1.2.3.4 ether 0:10:95:5:ad:df [|bootp]
15:39:35.429206 1.2.3.4.bootpc > 10.90.0.1.bootps: hops:1
xid:0xdfad0501 G:1.2.3.4 ether 0:10:95:5:ad:df [|bootp]
15:39:35.432792 1.2.3.2.bootps > 1.2.3.4.bootps: (reply) hops:1
xid:0xdfad0501 Y:xxx.xxx.xxx.xxx S:1.2.3.2 G:1.2.3.4 ether
0:10:95:5:ad:df [|bootp] (DF)

--
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQA8hO+VBOGVGcv6DNwRAnATAJ41CA57cwrv71e3qhTzVFv2Pz6j0QCgonV7
TPZfyZ+m7eZX3oHeZ3YhT9E=
=fFbZ
-----END PGP SIGNATURE-----

-- Attached file included as plaintext by Ecartis --
-- File: signature.asc
-- Desc: This is a digitally signed message part

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)

iD8DBQA+NvrwBOGVGcv6DNwRAglwAJ4vaW26WAs7OITw/SQax9ehy4RVjQCgm1Pg
8vYs8+rubFW/y1l8BxNFX4A=
=kERH
-----END PGP SIGNATURE-----

-----------------------------------------------------------------------
List Archives : http://www.isc.org/ml-archives/dhcp-server/
Unsubscribe : http://www.isc.org/dhcp-lists.html
-or- : mailto:dhcp-server-request@xxxxxxx?Subject=unsubscribe
-----------------------------------------------------------------------

Previous by Date:	RE: ethernet class and subclass: 00361, King, Michael
Next by Date:	Re: Anyone using Arris Cornerstone 1000?: 00361, Greg
Previous by Thread:	RE: re : Dhcp and cygwini: 00361, bhunt
Next by Thread:	Re: Anyone using Arris Cornerstone 1000?: 00361, Greg
Indexes:	[Date] [Thread] [Top] [All Lists]

<Prev in Thread]	Current Thread	[Next in Thread>