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Old 02-01-2016, 02:16 PM   #1
Registered: Mar 2009
Location: N.C.
Distribution: "gentoo|debian|arch"
Posts: 106

Rep: Reputation: 11
cannot get dhcpd to listen on a specific interface


I have added a VLAN to my home "project", got a 5324 Dell switch configured, a client system is able to communicate with the outside world via the Debian router.
Now I am trying to get dhcpd to listen on eth3.222 ( ), it starts with afaik proper parameters, but netstat still does not show the values I'd expect - it only listens on eth3:

tcp        0      0  *               LISTEN      23841/dhcpd
ps shows:
root     23841     1  0 Jan31 ?        00:00:02 /usr/sbin/dhcpd -q -cf /etc/dhcp/dhcpd.conf -pf /var/run/ eth3 eth3.222
/etc/default/isc-dhcp-server: ( only one line active )
INTERFACES="eth3 eth3.222"
dhcpd.conf section that "should" be controlling the vlan network
subnet netmask {
        #interface "eth3.222";
        option subnet-mask;
        option broadcast-address;
        option routers;
        option domain-name-servers x.x.x.x, x.x.x.x;
        allow unknown-clients;
        option domain-name "home222.local";
        pool {
               max-lease-time 600000;
I commented out the "interface" line, to see if there is any difference... no change.
also, I had to wrap eth3.222 in double-quotes because dhcpd was failing to start. ( it does not like the (.) - it expects semicolon. )

active interfaces:
edge0       Link encap:Ethernet  HWaddr ha:00:ha:00:ha:ha
eth2        Link encap:Ethernet  HWaddr 00:1b:78:5c:ca:3e
eth3        Link encap:Ethernet  HWaddr 00:1b:78:5c:ca:3f
eth3.222    Link encap:Ethernet  HWaddr 00:1b:78:5c:ca:3f
lo          Link encap:Local Loopback
ppp0        Link encap:Point-to-Point Protocol
dhcpd : 4.3.1
system: 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt9-2

I cannot figure out what else could I miss.

Any suggestions are appreciated.


Last edited by paziulek; 02-01-2016 at 02:18 PM.
Old 02-01-2016, 06:35 PM   #2
Registered: Mar 2009
Location: N.C.
Distribution: "gentoo|debian|arch"
Posts: 106

Original Poster
Rep: Reputation: 11
I looked at this again - this is the failover port that the dhcpd is configured for - it does communicate with its peer... only on interface. I am not sure what made me think and say "listen on", if these are tcp ports anyway... so called brain fart.

tcp        0      0  *               LISTEN      28094/dhcpd     
tcp        0      0          ESTABLISHED 28094/dhcpd

everything seems to be configured fine, but the system is still not able to get an IP address on the vlan 222.. tcpdump will be my next step.
( sorry for polluting the board )


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