[SOLVED] dhcpd across two adapters trouble.

orsty9001 · 03-01-2013, 07:32 AM

I've got two adapters on two different subnets. The adapter assigned 192.168.1.1 works fine. The other adapter assigned 192.168.10.1 works prefect accept dhcpd won't serve ip addresses over it for some reason. I've tried to open ports 67:68 thinking iptables was blocking it but that didn't work. If I set the ipaddress of the machine that's connecting everything works fine. Also I can ping everything from anywhere on the network. I'm thinking either something is blocking dhcp or dhcpd isn't configured right. Below is a copy of my dhcpd.conf.

Code:

# dhcpd.conf
#
# Configuration file for ISC dhcpd (see 'man dhcpd.conf')
#
#



ddns-update-style none;
authoritative;
log-facility local7;

subnet 192.168.1.0 netmask 255.255.255.0 {
 option routers 192.168.1.1;
 option subnet-mask 255.255.255.0;
 option broadcast-address 192.168.1.255;
 option domain-name-servers 4.2.2.1, 8.8.8.8;
 option domain-name "xxxxxx.xxx";
 default-lease-time 600;
 max-lease-time 7200;
 range 192.168.1.5 192.168.1.254;
}

subnet 192.168.10.0 netmask 255.255.255.0 {
 option routers 192.168.10.1;
 option subnet-mask 255.255.255.0;
 option broadcast-address 192.168.10.255;
 option domain-name-servers 8.8.8.8, 4.2.2.1;
 option domain-name "xxxxxx.xxx";
 default-lease-time 600;
 max-lease-time 7200;
 range 192.168.10.100 192.168.10.254;
}

acid_kewpie · 03-01-2013, 09:29 AM

what is logged to /var/log/messages when you restart the service?

does netstat show it listening on port 67?

what does running "tcpdump -i <interface> -nev port 67" show when you make a request?

orsty9001 · 03-01-2013, 09:34 AM

Quote:

Originally Posted by acid_kewpie

what is logged to /var/log/messages when you restart the service?

does netstat show it listening on port 67?

what does running "tcpdump -i <interface> -nev port 67" show when you make a request?

This is what it displays.

Quote:

10:31:06.283805 6c:62:6d:19:64:c0 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 6c:62:6d:19:64:c0, length 300, xid 0xecfa8749, secs 33, Flags [none]
Client-Ethernet-Address 6c:62:6d:19:64:c0
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 12: "netbook-55843"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP

/var/log/messages

Quote:

Mar 1 10:43:53 devbox dhcpd: Wrote 14 leases to leases file.
Mar 1 10:43:53 devbox dhcpd: Listening on LPF/wlan0/90:f6:52:e5:78:0a/192.168.10.0/24
Mar 1 10:43:53 devbox dhcpd: Sending on LPF/wlan0/90:f6:52:e5:78:0a/192.168.10.0/24
Mar 1 10:43:53 devbox dhcpd: Listening on LPF/eth1/00:04:4b:05:71:77/192.168.1.0/24
Mar 1 10:43:53 devbox dhcpd: Sending on LPF/eth1/00:04:4b:05:71:77/192.168.1.0/24
Mar 1 10:43:53 devbox dhcpd: Sending on Socket/fallback/fallback-net

acid_kewpie · 03-01-2013, 01:13 PM

Hmm, so there is no reply packet at all in tcpdump? it's apparently happily listening. What is your iptables ruleset looking like? "iptables -vnL"

orsty9001 · 03-01-2013, 01:24 PM

Here it is.

orsty9001 · 03-02-2013, 06:33 PM

It just solved itself. I have no idea what I did or what was done to fix the problem. It just started working while I was looking at something else.