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DHCP "no free leases"

Hi

So, i'm having this really frustrating issue that i hope someone inhere will magically make dissapear.. (or well, not magically, but hopefully someone will know what i have done wrong)

my setup is like this (i know, not a beauty, but it should give you an overview of the setup)

So, everything almost works, my pc's on VLAN 2 are getting IP's from DHCP (which works like a charm)

My Pc's on vlan 3 however refuses to get an IP, they have full connectivity when using a static IP on the Guest net though.

My guest interface has the following configuration on the interface and DHCP settings.

But when i look in the DHCP log, this is the result :-(

I simply cannot find the error, since this is a newly created DHCP scope, it is impossible that it should be full, not to mention that there aren't any entries from this network in the DHCP lease table, so i could really use some help here.

All help is much apreciated.

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0 teched_01 over 11 years ago
Sorry, this was on the back burner for a few days.

In your case you shouldn't need DHCP relay as your UTM has full layer-2 visibility (can see the layer-2 broadcasts) to the relevant networks.

If your smart switch were doing routing for vlans 2 & 3 and another vlan (4?) between it (smart switch) and the UTM then you'd need the switch (router) to relay the relevant DHCP traffic (broadcasts) to the DHCP server.

I haven't done a thorough verification of the following but it looks like it is a bug:

It appears that when enabling the DHCP Relay setting on a network that the UTM is on (layer-2) it creates a dhcpd.conf that results in the "no leases available".

Partial/approximate normal /var/chroot-dhcps/etc/dhcpd.conf from UTM:
group {
  subnet 192.168.0.0 netmask 255.255.255.0 {
    range 192.168.0.101 192.168.2.200;
     option domain-name-servers 192.168.2.100;
    option routers 192.168.0.100;
    option netbios-node-type 1;
    option subnet-mask 255.255.255.0;
    option broadcast-address 192.168.0.255;
    option wireless-security-magic-ip 192.168.0.100;
  }
}

Enabling DHCP Relay adds the following lines when the layer 2 network is on the UTM:
group {
  subnet 192.168.0.0 netmask 255.255.255.0 {}
}

(note no range or relevant options - no range = no leases available)

The configuration appears to generate correctly when the UTM doesn't otherwise know about the network.
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0 teched_01 over 11 years ago
Sorry, this was on the back burner for a few days.

In your case you shouldn't need DHCP relay as your UTM has full layer-2 visibility (can see the layer-2 broadcasts) to the relevant networks.

If your smart switch were doing routing for vlans 2 & 3 and another vlan (4?) between it (smart switch) and the UTM then you'd need the switch (router) to relay the relevant DHCP traffic (broadcasts) to the DHCP server.

I haven't done a thorough verification of the following but it looks like it is a bug:

It appears that when enabling the DHCP Relay setting on a network that the UTM is on (layer-2) it creates a dhcpd.conf that results in the "no leases available".

Partial/approximate normal /var/chroot-dhcps/etc/dhcpd.conf from UTM:
group {
  subnet 192.168.0.0 netmask 255.255.255.0 {
    range 192.168.0.101 192.168.2.200;
     option domain-name-servers 192.168.2.100;
    option routers 192.168.0.100;
    option netbios-node-type 1;
    option subnet-mask 255.255.255.0;
    option broadcast-address 192.168.0.255;
    option wireless-security-magic-ip 192.168.0.100;
  }
}

Enabling DHCP Relay adds the following lines when the layer 2 network is on the UTM:
group {
  subnet 192.168.0.0 netmask 255.255.255.0 {}
}

(note no range or relevant options - no range = no leases available)

The configuration appears to generate correctly when the UTM doesn't otherwise know about the network.
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DHCP "no free leases"

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