dhcp-users Digest, Vol 133, Issue 6

[Andrew Bell]

What kind of wifi controller are you using that can handle 65000+ users on
a single subnet?!

On Mon, Nov 11, 2019 at 11:23 AM Cayab, Jefrey E. <jcayab at gmail.com> wrote:

> Charles,
>
> Thank you for the suggestion which I did and the warning messages went
> away.
> Unfortunately, this server serves large events wherein wifi users could
> get up to 60,000
>
> Here's the log messages when I applied the changes:
> [root at dhcp ~]# tail -f /var/log/messages
> Nov 12 00:06:52 dhcp systemd: Stopping DHCPv4 Server Daemon...
> Nov 12 00:06:52 dhcp systemd: Stopped DHCPv4 Server Daemon.
> Nov 12 00:06:52 dhcp systemd: Starting DHCPv4 Server Daemon...
> Nov 12 00:06:52 dhcp dhcpd: Internet Systems Consortium DHCP Server 4.2.5
> Nov 12 00:06:52 dhcp dhcpd: Copyright 2004-2013 Internet Systems
> Consortium.
> Nov 12 00:06:52 dhcp dhcpd: All rights reserved.
> Nov 12 00:06:52 dhcp dhcpd: For info, please visit
> https://www.isc.org/software/dhcp/
> Nov 12 00:07:08 dhcp dhcpd: Not searching LDAP since ldap-server,
> ldap-port and ldap-base-dn were not specified in the config file
> Nov 12 00:07:08 dhcp dhcpd: Internet Systems Consortium DHCP Server 4.2.5
> Nov 12 00:07:08 dhcp dhcpd: Copyright 2004-2013 Internet Systems
> Consortium.
> Nov 12 00:07:08 dhcp dhcpd: All rights reserved.
> Nov 12 00:07:08 dhcp dhcpd: For info, please visit
> https://www.isc.org/software/dhcp/
> Nov 12 00:13:10 dhcp dhcpd: Wrote 0 class decls to leases file.
> Nov 12 00:13:10 dhcp dhcpd: Wrote 0 deleted host decls to leases file.
> Nov 12 00:13:10 dhcp dhcpd: Wrote 0 new dynamic host decls to leases file.
> Nov 12 00:13:11 dhcp dhcpd: Wrote 77733 leases to leases file.
> Nov 12 00:13:11 dhcp dhcpd: Listening on LPF/eth0/50:6b:8d:03:a8:b9/
> 10.16.5.0/24
> Nov 12 00:13:11 dhcp dhcpd: Sending on   LPF/eth0/50:6b:8d:03:a8:b9/
> 10.16.5.0/24
> Nov 12 00:13:11 dhcp dhcpd: Sending on   Socket/fallback/fallback-net
> Nov 12 00:13:11 dhcp systemd: Started DHCPv4 Server Daemon.
>
> Still 7 minutes :(
>
>
> On Mon, Nov 11, 2019 at 9:40 PM <dhcp-users-request at lists.isc.org> wrote:
>
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>> Today's Topics:
>>
>>    1. Re: [EXT] Re: dhcp-users Digest, Vol 133, Issue 4
>>       (Anderson, Charles R)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Mon, 11 Nov 2019 13:40:13 +0000
>> From: "Anderson, Charles R" <cra at wpi.edu>
>> To: Users of ISC DHCP <dhcp-users at lists.isc.org>
>> Subject: Re: [EXT] Re: dhcp-users Digest, Vol 133, Issue 4
>> Message-ID: <20191111134010.e3a3vxw57x2iqnn3 at angus.ind.wpi.edu>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> On Mon, Nov 11, 2019 at 08:26:27PM +0800, Cayab, Jefrey E. wrote:
>> > Hi,
>> >
>> > # No service will be given on this subnet, but declaring it helps the
>> > # DHCP server to understand the network topology.
>> >
>> > subnet 0.0.0.0 netmask 0.0.0.0 {
>> > }
>> >
>> > It was taken from the comment above it; I thought I could just put
>> anything
>> > - I'd appreciate if someone can give me what's the proper
>> Subnet/Netmask to
>> > put there. Does the comment above means that if my dhcp server is in
>> > 10.16.5.0/24 - this is the subnet and netmask I need to put there?
>>
>> Yes.  Your subnet statements must reflect reality and yes you do need a
>> subnet for your dhcp server local interface.
>>
>> The long loading time is because you have a HUGE number of IPs in
>> ranges.  Added up, you have about 656,000 IP addresses the server has to
>> keep track of.  Do you really need each subnet to handle 65534 dynamic IPs?
>>
>>
>>
>>
>> Move these group and host statements to global scope (not inside any
>> subnet).
>>
>>
>> ------------------------------
>>
>> Subject: Digest Footer
>>
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>> ------------------------------
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>> End of dhcp-users Digest, Vol 133, Issue 6
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