Hello, so i used the tutorial for creating a extender with relay (https://openwrt.org/docs/guide-user/network/wifi/relay_configuration), but after finding out that other people on the network, primarily people on the other AP, couldn't get a valid IP from the router. I reconfigured my extender with the help of (Relayd not forwarding broadcast (BOOTP/DHCP) responses - #18 by kolalok).
But i still get other devices dhcp requests that are not connected over mine extender.
The strange thing is that its only the second/ third floor who shares an AP. I'm on the first floor with an seperate AP and people from the same floor don't have the problem.
Tcpdump on the interface wlan0 shows that other devices are requesting.
09:29:31.401091 IP (tos 0x0, ttl 128, id 6845, 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 (oui Unknown), length 300, xid 0x4469f824, Flags [none] (0x0000)
Client-Ethernet-Address (oui Unknown)
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Client-ID Option 61, length 7: ether
Hostname Option 12, length 8: ""
Vendor-Class Option 60, length 8: "MSFT 5.0"
Parameter-Request Option 55, length 14:
Subnet-Mask, Default-Gateway, Domain-Name-Server, Domain-Name
Router-Discovery, Static-Route, Vendor-Option, Netbios-Name-Server
Netbios-Node, Netbios-Scope, Option 119, Classless-Static-Route
Classless-Static-Route-Microsoft, Option 252
09:29:31.506194 IP (tos 0x0, ttl 128, id 6846, offset 0, flags [none], proto UDP (17), length 358)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from (oui Unknown), length 330, xid 0x4469f824, Flags [none] (0x0000)
Client-Ethernet-Address (oui Unknown)
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Request
Client-ID Option 61, length 7: ether
Requested-IP Option 50, length 4: 192.168.0.133
Server-ID Option 54, length 4: 192.168.0.1
Hostname Option 12, length 8: ""
FQDN Option 81, length 27: ""
Vendor-Class Option 60, length 8: "MSFT 5.0"
Parameter-Request Option 55, length 14:
Subnet-Mask, Default-Gateway, Domain-Name-Server, Domain-Name
Router-Discovery, Static-Route, Vendor-Option, Netbios-Name-Server
Netbios-Node, Netbios-Scope, Option 119, Classless-Static-Route
Classless-Static-Route-Microsoft, Option 252
09:29:38.944269 IP (tos 0x0, ttl 128, id 6847, 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 (oui Unknown), length 300, xid 0x4469f824, Flags [none] (0x0000)
Client-IP 192.168.0.133
Client-Ethernet-Address (oui Unknown)
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Decline
Client-ID Option 61, length 7: ether
Requested-IP Option 50, length 4: 192.168.0.133
Server-ID Option 54, length 4: 192.168.0.1