On 24/09/13 10:48, Nehal J Wani wrote:
On Tue, Sep 24, 2013 at 1:15 AM, Simon Kelley<[email protected]> wrote:
On 23/09/13 19:12, Nehal J Wani wrote:
If I am not wrong, there are 5 fields in a dnsmasq/<network-name>.leases
file:
(i) Expiry time
(ii) MAC Address
(iii) IP Address
(iv) Hostname
(v) Client ID
Q1: Is the above order fixed?
Q2: Which values from above can be NULL? (I know that leases contains
'*' for fields whose values are not known, but is it safe to assume
that it will be '*' for any value that is unknown?)
A1: Yes.
A2: There will always be an expiry time and an IP address. The hostname and
the client-id can be missing, in which case the fields will contain *.
The Mac address may have a hardware type (rfc1060) appended like so:
02-01:02:03:04:05:06
If the hardware type is 01 (ethernet), then it's omitted
For IEEE1394 clients, the hardware type is 24, and the length of the MAC
address is zero, so this appears as
24-
See rfc2855 for details.
There's also I completely different format for DHCPv6. If DHCPv6 is in use
then the IPv4 leases will be terminated with a line like this:
duid<server DUID> as colon-separated hex
and then there will follow the DHCPv6 leases as
1) Expiry time
2) IAID
3) IPv6 address
4) hostname
5) client DUID
In case of DHCPv6, which of the above 5 fields can be missing (for
IPv6 addresses)?
Only the hostname, which can be replaced with "*" if no hostname is
known. All the others are required.
For both IPv4 and IPv6 leases, the expiry time can be zero which means
"never".
Cheers,
Simon.
Cheers,
Simon.
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