I see tons of ipv6-addresses with my phone, don't know where they come from, especially why more than once.
Which options do I have to disable dhcp-v6. See Fritzbox screenshots too please.
FYI, some phones do not use DHCPv6. Some use SLAAC.
There are various types of IPv6 addressing (i.e. Public IP, ULA, and Link-Local). Some may be from the OpenWrt, some may be from the Fritz. It would be better to understand IPv6 and perhaps the Wiki explaining configs, instead of asking us to troubleshoot the Fritz in this OpenWrt forum.
This is not troubleshooting for the Fritzbox and I do NOT ask for help with the Fritzbox. This is more or less a general question, which could be asked with a lot of routers, which are connected to an openwrt device.
Obviously it is not a good idea to configure 2 dhcp-servers. And I am unsure, if this is the case with ipv6. Therefore I mentioned the screenshot.
I am unsure if the DNS-server with the openwrt-device is configured correctly. I am wondering why it works, when I do not enter the openwrt-DNS-server. It works even on another openwrt-device.
The Fritzbox-Ethernet-ports have 3 Openwrt-devices connected at the moment.
root@WSM20-S0:~# grep -r "192.168.178.1" /etc/config/
/etc/config/network: option ipaddr '192.168.178.14'
/etc/config/network: option gateway '192.168.178.1'
/etc/config/network: list dns '192.168.178.1'
root@C7v5-G:~# grep -r "192.168.178.1" /etc/config/
/etc/config/network: option gateway '192.168.178.1'
/etc/config/network: list dns '192.168.178.1'
root@R7800:~# grep -r "192.168.178.1" /etc/config/
/etc/config/dhcp: list dhcp_option '3,192.168.178.1'
/etc/config/dhcp: option ip '192.168.178.153'
/etc/config/dhcp: option ip '192.168.178.154'
/etc/config/dhcp: option ip '192.168.178.155'
/etc/config/dhcp: option ip '192.168.178.156'
/etc/config/dhcp: option ip '192.168.178.157'
/etc/config/dhcp: option ip '192.168.178.158'
/etc/config/dhcp: option ip '192.168.178.160'
/etc/config/dhcp: option ip '192.168.178.161'
/etc/config/dhcp: option ip '192.168.178.163'
/etc/config/dhcp: option ip '192.168.178.164'
/etc/config/dhcp: option ip '192.168.178.174'
/etc/config/dhcp: option ip '192.168.178.190'
/etc/config/network: option ipaddr '192.168.178.13'
/etc/config/network: option gateway '192.168.178.1'
/etc/config/network: list dns '192.168.178.1'
So there is always
/etc/config/network: list dns '192.168.178.1'
With the Fritzbox and ipv4 DHCP is disabled. If it is enabled I can change the default DNS-server, if it is disabled DNS is grey. So I am assuming there is no dns-server running, but it looks like I am wrong.
I want to know only, if I have configured generally something wrong. At the end it doesn't matter which local DNS-server is used.
$ dig @192.168.178.1 openwrt.org
; <<>> DiG 9.18.18-0ubuntu0.22.04.1-Ubuntu <<>> @192.168.178.1 openwrt.org
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2816
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;openwrt.org. IN A
;; ANSWER SECTION:
openwrt.org. 1221 IN A 64.226.122.113
;; Query time: 3 msec
;; SERVER: 192.168.178.1#53(192.168.178.1) (UDP)
;; WHEN: Mon Jan 15 16:04:13 CET 2024
;; MSG SIZE rcvd: 56
$ dig @192.168.178.13 openwrt.org
; <<>> DiG 9.18.18-0ubuntu0.22.04.1-Ubuntu <<>> @192.168.178.13 openwrt.org
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19310
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;openwrt.org. IN A
;; ANSWER SECTION:
openwrt.org. 1205 IN A 64.226.122.113
;; Query time: 15 msec
;; SERVER: 192.168.178.13#53(192.168.178.13) (UDP)
;; WHEN: Mon Jan 15 16:04:29 CET 2024
;; MSG SIZE rcvd: 56
$ dig @192.168.178.153 openwrt.org
;; communications error to 192.168.178.153#53: connection refused
;; communications error to 192.168.178.153#53: connection refused
;; communications error to 192.168.178.153#53: connection refused
; <<>> DiG 9.18.18-0ubuntu0.22.04.1-Ubuntu <<>> @192.168.178.153 openwrt.org
; (1 server found)
;; global options: +cmd
;; no servers could be reached
So ithere is a device, with no running dns-server, there is:
no servers could be reached
Is it possible to test the dhcp-server with ipv6 in a similar way?
Yes, it is the case.
You need to disable all other DHCPv4 and v6 servers.
1 Like
Looks like it is getting an issue of the AVM firmware, which is offtopic here. What I found out, that there are some private IPv6 addresses created by the Fritzbox, although I disabeld DHCP-v6 at the Fritzbox. On the other hand I don't care if the Fritzbox shows a IPv6 address as long everything looks like to work.
noted, thanks