It seems the DHCP server for wired clients stops working after a few weeks. This is the second time this has happened to me since I got this router in August 2022. I got a number of clients direclty connected via Ethernet to the router. These clients include:

 

Alarm/Security system

Video Camera hub

MacBook Pro

Samsung Smart TVs

 

When this issue suddenly happens the wired clients have a self-assigned IP address. However, all the wireless clients work normally.

 

I tried the following troubleshooting steps without success:

 

1) Reloading router from the GUI

2) Hard reload via on/off switch

3) Disabling/Renabling DHCP server on router.

4) Manually relese/renew IP on client side

 

I looked at the router logs and there are no messages/issues reported.

Ran tcpdump on MacPro and it seems the router is not responding to DHCP messages while renew/release is performed. see below

 

In the past the issue goes away after a few days without intervention. The issue is currently happening and I am unable to recover. Please assist.

 

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en8: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500

options=6467<RXCSUM,TXCSUM,VLAN_MTU,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM>

ether 64:4b:f0:2b:82:b1

inet6 fe80::1008:edfa:1daf:430d%en8 prefixlen 64 secured scopeid 0xd

inet 169.254.229.38 netmask 0xffff0000 broadcast 169.254.255.255

nd6 options=201<PERFORMNUD,DAD>

media: autoselect (1000baseT <full-duplex>)

status: active

**********@MacBook-Pro ~ % sudo tcpdump -i en8 port 67 or port 68 -e -n -vv

tcpdump: listening on en8, link-type EN10MB (Ethernet), capture size 262144 bytes

12:18:02.646808 64:4b:f0:2b:82:b1 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: (tos 0x0, ttl 255, id 59755, 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 64:4b:f0:2b:82:b1, length 300, xid 0xabd3b48, secs 9, Flags [none] (0x0000)

  Client-Ethernet-Address 64:4b:f0:2b:82:b1

  Vendor-rfc1048 Extensions

    Magic Cookie 0x63825363

    DHCP-Message Option 53, length 1: Discover

    Parameter-Request Option 55, length 12:

      Subnet-Mask, Classless-Static-Route, Default-Gateway, Domain-Name-Server

      Domain-Name, Option 108, URL, Option 119

      Option 252, LDAP, Netbios-Name-Server, Netbios-Node

    MSZ Option 57, length 2: 1500

    Client-ID Option 61, length 7: ether 64:4b:f0:2b:82:b1

    Lease-Time Option 51, length 4: 7776000

    Hostname Option 12, length 11: "MacBook-Pro"

12:18:05.258158 64:4b:f0:2b:82:b1 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: (tos 0x0, ttl 255, id 59756, 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 64:4b:f0:2b:82:b1, length 300, xid 0xabd3b49, Flags [none] (0x0000)

  Client-Ethernet-Address 64:4b:f0:2b:82:b1

  Vendor-rfc1048 Extensions

    Magic Cookie 0x63825363

    DHCP-Message Option 53, length 1: Discover

    Parameter-Request Option 55, length 12:

      Subnet-Mask, Classless-Static-Route, Default-Gateway, Domain-Name-Server

      Domain-Name, Option 108, URL, Option 119

      Option 252, LDAP, Netbios-Name-Server, Netbios-Node

    MSZ Option 57, length 2: 1500

    Client-ID Option 61, length 7: ether 64:4b:f0:2b:82:b1

    Lease-Time Option 51, length 4: 7776000

    Hostname Option 12, length 11: "MacBook-Pro"

12:18:06.677086 64:4b:f0:2b:82:b1 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: (tos 0x0, ttl 255, id 59757, 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 64:4b:f0:2b:82:b1, length 300, xid 0xabd3b49, secs 1, Flags [none] (0x0000)

  Client-Ethernet-Address 64:4b:f0:2b:82:b1

  Vendor-rfc1048 Extensions

    Magic Cookie 0x63825363

    DHCP-Message Option 53, length 1: Discover

    Parameter-Request Option 55, length 12:

      Subnet-Mask, Classless-Static-Route, Default-Gateway, Domain-Name-Server

      Domain-Name, Option 108, URL, Option 119

      Option 252, LDAP, Netbios-Name-Server, Netbios-Node

    MSZ Option 57, length 2: 1500

    Client-ID Option 61, length 7: ether 64:4b:f0:2b:82:b1

    Lease-Time Option 51, length 4: 7776000

    Hostname Option 12, length 11: "MacBook-Pro"

12:18:09.229773 64:4b:f0:2b:82:b1 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: (tos 0x0, ttl 255, id 59758, 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 64:4b:f0:2b:82:b1, length 300, xid 0xabd3b49, secs 4, Flags [none] (0x0000)

  Client-Ethernet-Address 64:4b:f0:2b:82:b1

  Vendor-rfc1048 Extensions

    Magic Cookie 0x63825363

    DHCP-Message Option 53, length 1: Discover

    Parameter-Request Option 55, length 12:

      Subnet-Mask, Classless-Static-Route, Default-Gateway, Domain-Name-Server

      Domain-Name, Option 108, URL, Option 119

      Option 252, LDAP, Netbios-Name-Server, Netbios-Node

    MSZ Option 57, length 2: 1500

    Client-ID Option 61, length 7: ether 64:4b:f0:2b:82:b1

    Lease-Time Option 51, length 4: 7776000

    Hostname Option 12, length 11: "MacBook-Pro"

^C

4 packets captured

6 packets received by filter

0 packets dropped by kernel