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Today's Topics:
1. Apple TV 4K keeps requesting DHCP lease (Philip Prindeville)
----------------------------------------------------------------------
Message: 1
Date: Thu, 24 Jul 2025 00:18:54 -0600
From: Philip Prindeville <philipp_s...@redfish-solutions.com>
To: dhcp-users@lists.isc.org
Subject: Apple TV 4K keeps requesting DHCP lease
Message-ID:
<800fd259-affa-4e21-ad1b-5c39e193f...@redfish-solutions.com>
Content-Type: text/plain; charset=utf-8
Hi,
I have a couple of Apple TV?s that keep harassing my DHCP server, which is
4.4.3-P1.
Traces are below.
The config for my server looks like:
authoritative;
ddns-domainname "redfish-solutions.com.";
ddns-update-style standard;
ddns-updates on;
ignore client-updates;
update-static-leases on;
use-host-decl-names on;
update-conflict-detection off;
update-optimization off;
?
log-facility daemon;
default-lease-time 3600;
max-lease-time 86400;
option domain-name "redfish-solutions.com";
# additional codes
option classless-ipv4-route code 121 = array of { unsigned integer 8 };
?
subnet 192.168.6.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.6.255;
deny unknown-clients;
default-lease-time 43200;
max-lease-time 43200;
option routers 192.168.6.1;
option domain-name-servers 192.168.6.1;
}
?
host Penthouse-9c3e530d9fbe {
hardware ethernet 9c:3e:53:0d:9f:be;
fixed-address 192.168.6.242;
option host-name "Penthouse";
if exists dhcp-parameter-request-list {
option dhcp-parameter-request-list = concat(option
dhcp-parameter-request-list, 3a);
}
}
host Penthouse-9c3e5309d1c5 {
hardware ethernet 9c:3e:53:09:d1:c5;
fixed-address 192.168.6.242;
option host-name "Penthouse";
if exists dhcp-parameter-request-list {
option dhcp-parameter-request-list = concat(option
dhcp-parameter-request-list, 3a);
}
}
I?ve provisioned both the Ethernet and WiFi MAC addresses but the TV?s are
hardwired.
The tcpdumps look like:
00:07:22.605432 9c:3e:53:09:d1:c5 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800),
length 342: (tos 0x0, ttl 255, id 22192, offset 0, flags [none], proto UDP
(17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from
9c:3e:53:09:d1:c5, length 300, xid 0x87ec8a54, secs 1, Flags [none] (0x0000)
Client-Ethernet-Address 9c:3e:53:09:d1:c5
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message (53), length 1: Request
Parameter-Request (55), length 9: Subnet-Mask (1),
Classless-Static-Route (121), Default-Gateway (3), Domain-Name-Server (6)
Domain-Name (15), Unknown (108), URL (114), Unknown (119)
Unknown (252)
MSZ (57), length 2: 1500
Client-ID (61), length 7: ether 9c:3e:53:09:d1:c5
Requested-IP (50), length 4: 192.168.6.242
Lease-Time (51), length 4: 7776000
Hostname (12), length 11: "Penthouse-6"
00:07:22.605800 ac:1f:6b:1d:fb:80 > 9c:3e:53:09:d1:c5, ethertype IPv4 (0x0800),
length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17),
length 328)
192.168.6.1.67 > 192.168.6.242.68: [udp sum ok] BOOTP/DHCP, Reply, length
300, xid 0x87ec8a54, secs 1, Flags [none] (0x0000)
Your-IP 192.168.6.242
Client-Ethernet-Address 9c:3e:53:09:d1:c5
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message (53), length 1: ACK
Server-ID (54), length 4: 192.168.6.1
Lease-Time (51), length 4: 43200
Subnet-Mask (1), length 4: 255.255.255.0
Default-Gateway (3), length 4: 192.168.6.1
Domain-Name-Server (6), length 4: 192.168.6.1
Domain-Name (15), length 21: "redfish-solutions.com"
00:07:24.859045 9c:3e:53:0d:9f:be > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800),
length 342: (tos 0x0, ttl 255, id 22193, offset 0, flags [none], proto UDP
(17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from
9c:3e:53:0d:9f:be, length 300, xid 0xbfede3b8, Flags [none] (0x0000)
Client-Ethernet-Address 9c:3e:53:0d:9f:be
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message (53), length 1: Request
Parameter-Request (55), length 9: Subnet-Mask (1),
Classless-Static-Route (121), Default-Gateway (3), Domain-Name-Server (6)
Domain-Name (15), Unknown (108), URL (114), Unknown (119)
Unknown (252)
MSZ (57), length 2: 1500
Client-ID (61), length 7: ether 9c:3e:53:0d:9f:be
Requested-IP (50), length 4: 192.168.6.242
Lease-Time (51), length 4: 7776000
Hostname (12), length 11: "Penthouse-6"
00:07:24.859370 ac:1f:6b:1d:fb:80 > 9c:3e:53:0d:9f:be, ethertype IPv4 (0x0800),
length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17),
length 328)
192.168.6.1.67 > 192.168.6.242.68: [udp sum ok] BOOTP/DHCP, Reply, length
300, xid 0xbfede3b8, Flags [none] (0x0000)
Your-IP 192.168.6.242
Client-Ethernet-Address 9c:3e:53:0d:9f:be
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message (53), length 1: ACK
Server-ID (54), length 4: 192.168.6.1
Lease-Time (51), length 4: 43200
Subnet-Mask (1), length 4: 255.255.255.0
Default-Gateway (3), length 4: 192.168.6.1
Domain-Name-Server (6), length 4: 192.168.6.1
Domain-Name (15), length 21: "redfish-solutions.com?
00:07:34.809046 58:d3:49:e7:ca:37 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800),
length 342: (tos 0x0, ttl 255, id 38810, offset 0, flags [none], proto UDP
(17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from
58:d3:49:e7:ca:37, length 300, xid 0x27e24d21, Flags [none] (0x0000)
Client-Ethernet-Address 58:d3:49:e7:ca:37
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message (53), length 1: Request
Parameter-Request (55), length 9: Subnet-Mask (1),
Classless-Static-Route (121), Default-Gateway (3), Domain-Name-Server (6)
Domain-Name (15), Unknown (108), URL (114), Unknown (119)
Unknown (252)
MSZ (57), length 2: 1500
Client-ID (61), length 7: ether 58:d3:49:e7:ca:37
Requested-IP (50), length 4: 192.168.6.240
Lease-Time (51), length 4: 7776000
Hostname (12), length 13: "Living-Room-2"
00:07:34.809455 ac:1f:6b:1d:fb:80 > 58:d3:49:e7:ca:37, ethertype IPv4 (0x0800),
length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17),
length 328)
192.168.6.1.67 > 192.168.6.240.68: [udp sum ok] BOOTP/DHCP, Reply, length
300, xid 0x27e24d21, Flags [none] (0x0000)
Your-IP 192.168.6.240
Client-Ethernet-Address 58:d3:49:e7:ca:37
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message (53), length 1: ACK
Server-ID (54), length 4: 192.168.6.1
Lease-Time (51), length 4: 43200
Subnet-Mask (1), length 4: 255.255.255.0
Default-Gateway (3), length 4: 192.168.6.1
Domain-Name-Server (6), length 4: 192.168.6.1
Domain-Name (15), length 21: "redfish-solutions.com"
00:07:40.513058 9c:3e:53:09:d1:c5 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800),
length 342: (tos 0x0, ttl 255, id 22195, offset 0, flags [none], proto UDP
(17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from
9c:3e:53:09:d1:c5, length 300, xid 0x87ec8a55, Flags [none] (0x0000)
Client-Ethernet-Address 9c:3e:53:09:d1:c5
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message (53), length 1: Request
Parameter-Request (55), length 9: Subnet-Mask (1),
Classless-Static-Route (121), Default-Gateway (3), Domain-Name-Server (6)
Domain-Name (15), Unknown (108), URL (114), Unknown (119)
Unknown (252)
MSZ (57), length 2: 1500
Client-ID (61), length 7: ether 9c:3e:53:09:d1:c5
Requested-IP (50), length 4: 192.168.6.242
Lease-Time (51), length 4: 7776000
Hostname (12), length 11: "Penthouse-6"
00:07:40.513486 ac:1f:6b:1d:fb:80 > 9c:3e:53:09:d1:c5, ethertype IPv4 (0x0800),
length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17),
length 328)
192.168.6.1.67 > 192.168.6.242.68: [udp sum ok] BOOTP/DHCP, Reply, length
300, xid 0x87ec8a55, Flags [none] (0x0000)
Your-IP 192.168.6.242
Client-Ethernet-Address 9c:3e:53:09:d1:c5
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message (53), length 1: ACK
Server-ID (54), length 4: 192.168.6.1
Lease-Time (51), length 4: 43200
Subnet-Mask (1), length 4: 255.255.255.0
Default-Gateway (3), length 4: 192.168.6.1
Domain-Name-Server (6), length 4: 192.168.6.1
Domain-Name (15), length 21: "redfish-solutions.com?
And this repeats every 15-30 seconds. It?s filling up my firewall logs.
The older Apple TV?s (the HD, not 4K ones) don?t do this. Yes, all the devices
are running current firmware.
Anyone else ever seen this?
Thanks
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