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Re: HELP! dhcp server not talking to clients



hmm.. interesting.  it's possible that your udp packets are getting
dropped because your 10.0.0.x and 192.168.1.x networks have different
subnet masks.  how about this:

on your linux box,
- turn off dhcpd 
- set up your box to automatically configure it's ethernet device via dhcp
	("auto eth0" and "iface eth0 inet dhcp" in /etc/network/interfaces)
# /etc/init.d/networking restart

and see if your linux box sees this dhcp server as well.  also, do you
have some kind of fancy d-link or linksys router?  sometimes they run
dhcp daemons as well.


hth
	sean



On Tue, Dec 17, 2002 at 11:37:42AM -0600, Charles Lewis wrote:
> 'nmap -sU -p 67 192.168.1.*' produces the following results.
> 
> Starting nmap V. 3.10ALPHA4 ( www.insecure.org/nmap/ )
> Nmap run completed -- 256 IP addresses (0 hosts up) scanned in 46.453 
> seconds
> 
> 'nmap -sU -p 67 10.0.0.*' produces the following results:
> 
> Starting nmap V. 3.10ALPHA4 ( www.insecure.org/nmap/ )
> Interesting ports on lewisc (10.0.0.1):
> Port       State       Service
> 67/udp     open        dhcpserver
> 
> The 1 scanned port on lewisc2 (10.0.0.2) is: closed
> 
> Nmap run completed -- 256 IP addresses (2 hosts up) scanned in 36.155 
> seconds
> 
> This is somewhat expected. 10.0.0.1 is the proper dhcp server. 10.0.0.2 
> is the Win2000 client machine (apparently it is successfully getting its 
> lease). What is NOT showing up is the printer (10.0.0.5) and the Win98 
> machine (10.0.0.4)
> 
> Apparently they are on the 192.168.1.* subnet, but why did a scan of 
> that subnet not produce anything?
> 
> chas
> 
> p.s. I just had my wife reboot the Win98 machine (I'm working remotely 
> using the dynamic IP that my ISP provides), and it apparently got the 
> correct lease. I've also had her reset the externel jet direct print 
> server using several methods, but without success. It still is getting 
> from 192.168.1.101 from a dhcp server at 192.168.1.1?!
> 
> sean finney wrote:
> 
> >hey charles, are you sure another machine isn't running a dhcpd?  i
> >sure don't see 192 addresses in your config...  try installing nmap
> >and then doing
> >
> ># nmap -sU -p 67 host
> >
> >for all the suspect hosts.  
> >
> >hth
> >	sean
> >
> >On Mon, Dec 16, 2002 at 11:53:00PM -0600, Charles Lewis wrote:
> >  
> >
> >>I have dhcp set up on my linux box to serve a Win2000 box, a Win98 box, 
> >>a WinXP box, and networked HP LJ1200. It works fine, until I try to 
> >>upgrade the kernel from 2.4.18 to 2.4.20 (from an earlier thread). The 
> >>machine locks up after a few minutes, so I go back to 2.4.18, and all my 
> >>  machines are getting 198.168.1.x numbers when my dhcp server is 
> >>supposed to be providing 10.0.0.x numbers. It's very frustrating to 
> >>everyone in the house because suddenly none of them can use the 
> >>internet, print, or save files to their samba shares. Now I am not a 
> >>network guru, so maybe someone can help me spot some problems in my setup.
> >>
> >>Here is my dhcpd.conf:
> >>
> >>#option domain-name "";
> >>#option domain-name-servers 205.165.192.254,205.165.193.254;
> >>
> >>server-identifier lewisc;
> >>authoritative;
> >>option subnet-mask 255.255.255.0;
> >>default-lease-time 600;
> >>max-lease-time 7200;
> >>subnet 10.0.0.0 netmask 255.255.255.0 {
> >>   range 10.0.0.6 10.0.0.254;
> >>   option broadcast-address 10.0.0.255;
> >>   option routers 10.0.0.1;
> >>   option netbios-name-servers 10.0.0.1;
> >>}
> >>
> >>host lewisc2 {
> >>   hardware ethernet 00:01:03:E7:48:1F;
> >>   fixed-address 10.0.0.2;
> >>}
> >>
> >>host lewisc3 {
> >>   hardware ethernet 00:00:39:F0:9A:C5;
> >>   fixed-address 10.0.0.3;
> >>}
> >>
> >>host caleb {
> >>   hardware ethernet 00:A0:CC:D2:A0:73;
> >>   fixed-address 10.0.0.4;
> >>}
> >>
> >>host officelj {
> >>   hardware ethernet 00:01:E6:48:69:A2;
> >>   fixed-address 10.0.0.5;
> >>}
> >>
> >>When I run dhcpd in debug mode, I get:
> >>
> >>Listening on LPF/eth0/00:01:03:dd:22:e0/10.0.0.0
> >>Sending on   LPF/eth0/00:01:03:dd:22:e0/10.0.0.0
> >>Sending on   Socket/fallback/fallback-net
> >>
> >>And it just sits there with no feedback.
> >>
> >>When I do a tcpdump -i eth0, I get the following junk:
> >>23:46:04.324753 192.168.1.102.netbios-dgm > 192.168.1.255.netbios-dgm: 
> >>NBT UDP PACKET(138)
> >>23:46:33.933645 192.168.1.1.bootps > 255.255.255.255.bootpc: 
> >>xid:0xbee8b113 C:192.168.1.101 Y:192.168.1.101 ether 0:1:e6:48:69:a2 
> >>file ""[|bootp]
> >>23:46:36.287786 arp who-has 192.168.1.1 tell 192.168.1.102
> >>23:46:36.289146 192.168.1.1.bootps > 255.255.255.255.bootpc: 
> >>xid:0xf220e34f C:192.168.1.102 Y:192.168.1.102 ether 0:a0:cc:d2:a0:73 
> >>file ""[|bootp]
> >>23:49:04.314952 192.168.1.1.bootps > 255.255.255.255.bootpc: 
> >>xid:0x28e8b113 C:192.168.1.101 Y:192.168.1.101 ether 0:1:e6:48:69:a2 
> >>file ""[|bootp]
> >>23:49:06.268378 arp who-has 192.168.1.1 tell 192.168.1.102
> >>23:49:06.269729 192.168.1.1.bootps > 255.255.255.255.bootpc: 
> >>xid:0xdd3f9a45 C:192.168.1.102 Y:192.168.1.102 ether 0:a0:cc:d2:a0:73 
> >>file ""[|bootp]
> >>
> >>The last time this happened, it eventually started working, but I think 
> >>it may have been because the lease ran out on all the machines. *shrug* 
> >>I don't know but I'm ready to pull what little hair I have left out. Any 
> >>ideas would be GREATLY appreciated.
> >>
> >>Charles Lewis
> >>
> >>
> >>
> >>-- 
> >>To UNSUBSCRIBE, email to debian-user-request@lists.debian.org 
> >>with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
> >>    
> >>
> >
> >  
> >
> 
> 
> 
> -- 
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