Problem with IP address lease expire on ac86u

[tm4ig]

Earlier I have already created thread about my problem https://www.snbforums.com/threads/problem-with-ip-address-lease-expiration.55609/

Now I am using asuswrt merlin firmware 384.15 and I have intstalled tcpdump on my router for problem debugging.

I execute this command on router "nohup tcpdump -i eth0 -n port 67 or port 68 -vvv > /tmp/mnt/sda/tcpdump_log/beeline_dhcp.txt &" and after problem appear I watch in log:
...
06:02:22.747630 IP (tos 0x0, ttl 64, id 0, offset 0, flags [none], proto UDP (17), length 328)
my_IP > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from my_mac, length 300, xid 0xae5bc506, secs 225, Flags [none] (0x0000)
Client-IP my_IP
Client-Ethernet-Address my_mac
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Request
Client-ID Option 61, length 7: ether my_mac
MSZ Option 57, length 2: 1492
Parameter-Request Option 55, length 9:
Subnet-Mask, Default-Gateway, Domain-Name-Server, Hostname
Domain-Name, BR, Static-Route, NTP
Classless-Static-Route-Microsoft
Vendor-Class Option 60, length 12: "udhcp 1.25.1"
END Option 255, length 0
PAD Option 0, length 0, occurs 18
06:02:22.753596 IP (tos 0xc0, ttl 16, id 0, offset 0, flags [none], proto UDP (17), length 328)
78.107.125.53.67 > my_IP: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0xae5bc506, secs 225, Flags [none] (0x0000)
Client-IP my_IP
Your-IP my_IP
Client-Ethernet-Address my_mac
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: ACK
Server-ID Option 54, length 4: 78.107.125.53
Lease-Time Option 51, length 4: 600
Subnet-Mask Option 1, length 4: 255.255.248.0
Default-Gateway Option 3, length 4: 2.92.208.1
Domain-Name-Server Option 6, length 8: 85.21.192.5,213.234.192.7
RN Option 58, length 4: 300
RB Option 59, length 4: 525
END Option 255, length 0
PAD Option 0, length 0, occurs 10

My router ac86u have sented dhcp request at 06:02:22.747630, my priveder's dhcp server send reply at 06:02:22.753596 but after that router stopped send dhcp requests and after that I get IP adress expired error.

Why ac86u stopped to send dhcp requests, but dhcp server is working normaly

 

[ColinTaylor]

You reported this problem a year ago. What has happened since then? Did the problem fix itself and has now returned? Have you been using a different router?

 

[tm4ig]

I have tried ac87u. With ac87u I have not problem, only with ac86u
Problem with ac86u did not fixed.