DaemonForums  

Go Back   DaemonForums > OpenBSD > OpenBSD General

OpenBSD General Other questions regarding OpenBSD which do not fit in any of the categories below.

Reply
 
Thread Tools Display Modes
  #1   (View Single Post)  
Old 1st July 2010
vdubjunkie vdubjunkie is offline
Port Guard
 
Join Date: Feb 2009
Posts: 17
Default dhcpd not working as I would expect

Code:
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33204
        groups: lo
        inet 127.0.0.1 netmask 0xff000000
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x6
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:50:da:b2:37:1c
        groups: egress
        media: Ethernet autoselect (100baseTX full-duplex)
        status: active
        inet6 fe80::250:daff:feb2:371c%xl0 prefixlen 64 scopeid 0x1
        inet x.x.x.x netmask 0xffffffe0 broadcast x.x.x.x
xl1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:01:03:de:32:84
        description: Wired
        media: Ethernet 100baseTX full-duplex (100baseTX half-duplex)
        status: active
        inet 10.100.0.226 netmask 0xffff0000 broadcast 10.100.255.255
        inet6 fe80::201:3ff:fede:3284%xl1 prefixlen 64 scopeid 0x2
xl2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:50:da:5b:71:54
        description: Wireless
        media: Ethernet 100baseTX full-duplex (100baseTX half-duplex)
        status: active
        inet 172.16.0.226 netmask 0xfffff000 broadcast 172.16.15.255
        inet6 fe80::250:daff:fe5b:7154%xl2 prefixlen 64 scopeid 0x3
vr0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:11:2f:7b:c1:41
        media: Ethernet autoselect (none)
        status: no carrier
enc0: flags=0<> mtu 1536
pflog0: flags=141<UP,RUNNING,PROMISC> mtu 33204
        groups: pflog
Code:
# grep -v "#" /etc/dhcpd.conf

authoritative;


shared-network WIRED {
        default-lease-time 86400;
        option  domain-name "freak.dub";
        option nis-domain "freak.dub";
        option  domain-name-servers 172.16.0.226, x.x.x.2, x.x.x.3, x.x.x.20, x.x.x.25, x.x..30;
        option broadcast-address 172.16.0.255;
        option routers 172.16.0.226;
        option ntp-servers 172.16.0.226;
        subnet 172.16.0.0 netmask 255.255.255.0 {
                range 172.16.0.25 172.16.0.35;
        }
        host vdubmac {
                hardware ethernet 00:25:00:4d:24:df;
                fixed-address 172.16.0.222;
        }
}

shared-network WIRELESS {
        option domain-name "wifi.freak.dub";
        option domain-name-servers 172.16.0.226, x.x.x.2, x.x.x.3, x.x.x.20, x.x.x.25, x.x.x.30;
        subnet 172.16.0.0 netmask 255.255.255.0 {
                option routers 172.16.0.226;
                option domain-name-servers 172.16.0.226;
                option ntp-servers 172.16.0.226;
                range 172.16.0.25 172.16.0.35;
        }
}
xl1 is WIRED subnet and xl2 is WIRELESS subnet. When I had "10.100.0.226" as the WIRED router, it bled through to my laptop which gets it's IP via a Linksys AP being used as just that, an AP only, to the WIRELESS vlan on my Catalyst 2950 switch which is shared by the port on the switch which connects to my xl2 iface.

Can anybody tell me why it's not handing out the WIRELESS settings to a client getting it's IP via the WIRELESS interface?

oh yes...
Code:
# uname -a
OpenBSD zeus.freak.dub 4.4 GENERIC#1021 i386
__________________
anything done in the GUI is done more efficiently in cli

Last edited by vdubjunkie; 1st July 2010 at 03:21 AM. Reason: additional useful information
Reply With Quote
  #2   (View Single Post)  
Old 1st July 2010
jggimi's Avatar
jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
Location: USA
Posts: 7,975
Default

If you want dhcpd to hand out addresses on only one subnet, start dhcpd so that it only listens on that one subnet. For example, you could add the following to /etc/rc.conf.local:
Code:
dhcpd_flags="xl2"
Reply With Quote
  #3   (View Single Post)  
Old 1st July 2010
jggimi's Avatar
jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
Location: USA
Posts: 7,975
Default

OK. I noted you already posted about using one or two NICs with dhcpd, in an earlier thread.

I went back and looked at your dhcpd.conf, and found the problem.

You have two NICs on the same subnet, 172.16.0.0/16. That is the reason for "bleeding". Use different subnets for wired and wireless, and your problem will be solved.
Reply With Quote
  #4   (View Single Post)  
Old 1st July 2010
vdubjunkie vdubjunkie is offline
Port Guard
 
Join Date: Feb 2009
Posts: 17
Default previous version of dhcpd.conf

I'm sorry I may not have been clear. The 172.16 IPs used in the WIRED section were put that way in order to make the system work. This was how I proved that the WIRELESS IP being handed out was getting it's values from that section. Here is the previous version which I have conveniently saved as always..

Code:
# cat dhcpd.conf.orig                                                          

authoritative;


shared-network WIRED {
        default-lease-time 86400;
        #max-lease-time 172800;
        option  domain-name "freak.dub";
        option nis-domain "freak.dub";
        option time-offset -6; #CST
        option  domain-name-servers 10.100.0.226, x.x.x.2, x.x.x.3, x.x.x.20, x.x.x.25, x.x.x.30;
        option broadcast-address 10.100.0.255;
        option routers 10.100.0.226;
        option ntp-servers 10.100.0.226;
        subnet 10.100.0.0 netmask 255.255.255.0 {
                range 10.100.0.25 10.100.0.35;
        }
        host vdubmac {
                #next-server ns1.freak.dub;
                hardware ethernet 00:25:00:4d:24:df;
                fixed-address 10.100.0.222;
        }
}

shared-network WIRELESS {
        option domain-name "wifi.freak.dub";
        option domain-name-servers 172.16.0.226, x.x.x.2, x.x.x.3, x.x.x.20, x.x.x.25, x.x.x.30;
        subnet 172.16.0.0 netmask 255.255.255.0 {
                option routers 172.16.0.226;
                option domain-name-servers 172.16.0.226;
                option ntp-servers 172.16.0.226;
                range 172.16.0.25 172.16.0.35;
        }
}
__________________
anything done in the GUI is done more efficiently in cli
Reply With Quote
  #5   (View Single Post)  
Old 2nd July 2010
jggimi's Avatar
jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
Location: USA
Posts: 7,975
Default

From the dhcpd.conf(5) man page:
Quote:
The shared-network statement is used to inform the DHCP server that some
IP subnets actually share the same physical network. Any subnets in a
shared network should be declared within a shared-network statement.
Parameters specified in the shared-network statement will be used when
booting clients on those subnets unless parameters provided at the subnet
or host level override them. If any subnet in a shared network has
addresses available for dynamic allocation, those addresses are collected
into a common pool for that shared network and assigned to clients as
needed. There is no way to distinguish on which subnet of a shared
network a client should boot.
My recommendation: don't use it. Use the subnet statement, instead.

Last edited by jggimi; 2nd July 2010 at 06:20 PM.
Reply With Quote
  #6   (View Single Post)  
Old 6th July 2010
There0 There0 is offline
./dev/null
 
Join Date: Jul 2008
Posts: 170
Default

I agree competely with that last statement of jggimi, it is highly recommended NOT to share the same subnet with ANY interface (under certain extreme situations?) especially a wireless one.
__________________
The more you learn, the more you realize how little you know ....
Reply With Quote
  #7   (View Single Post)  
Old 9th July 2010
vdubjunkie vdubjunkie is offline
Port Guard
 
Join Date: Feb 2009
Posts: 17
Default Indeed

Thanks so much. Most examples I've found use that shared-network pragma. Understanding the difference was clear and simple once you pointed me in the right direction, and naturally this has solved my problem.
__________________
anything done in the GUI is done more efficiently in cli
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
dhcpd, dhcrelay, and ipsec VPN dontek OpenBSD General 2 22nd May 2010 08:52 PM
dhcpd, vista and wlan hamba FreeBSD Ports and Packages 5 8th September 2009 04:34 PM
dhcpd and dns sputnik OpenBSD General 8 8th May 2009 02:50 PM
dhcpd and multiple subnets vdubjunkie OpenBSD General 5 11th March 2009 11:02 PM
dhcpd within ezjail? zelut FreeBSD General 7 10th February 2009 10:31 PM


All times are GMT. The time now is 07:06 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Content copyright © 2007-2010, the authors
Daemon image copyright ©1988, Marshall Kirk McKusick