Hello,
I am using odhcp full as ipv6 AND ipv4 dhcp server and unbound instead of the dnsmasq.
My external Internet is provided by a DSL Line through a Zyxel Modem (Vigor 167). I do get my external IP via DHCP.
When I do run odhcp as ipv4 dhcp server my external interface ("WAN") does get the IP from the internal IP address pool (as the odhcp seems to be faster than the DHCP server from my service provider). If I do temporarily stop odhcpd, then bring the WAN interface down and up again, I do get the correct external IP. I can bring up odhcpd then again. But this manual workaround obviously fails in case of a reboot of the OpenWRT router. (Raspberry Pi 4 in this case)
I have configured the wan interface with dhcp "ignore" in /etc/config/dhcp
config dhcp 'wan'
So my expectation was that odhcp should not offer IP to the WAN interface. Unfortunately this does not seem to be true.
Am I doing something wrong or is this a bug?
Cheers,
trendy
September 15, 2021, 12:59pm
2
I don't see the ignore option in odhcpd readme . Maybe the dhcpv4 option in line 83 should be disabled instead for the wan interface.
1 Like
Thank you,
tried that too with no differrent behavior:
option dhcpv4 'disabled'
Cheers,
trendy
September 15, 2021, 1:15pm
4
Please run the following commands (copy-paste the whole block) and paste the output here, using the "Preformatted text </> " button:
ubus call system board; \
uci export network; uci export dhcp; \
netstat -lnp
1 Like
{
"kernel": "5.4.143",
"hostname": "router",
"system": "ARMv8 Processor rev 4",
"model": "Raspberry Pi 3 Model B Rev 1.2",
"board_name": "raspberrypi,3-model-b",
"release": {
"distribution": "OpenWrt",
"version": "21.02.0",
"revision": "r16279-5cc0535800",
"target": "bcm27xx/bcm2710",
"description": "OpenWrt 21.02.0 r16279-5cc0535800"
}
}
package network
config interface 'loopback'
option device 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'
config globals 'globals'
option ula_prefix '<removed>/48'
config device
option name 'br-lan'
option type 'bridge'
list ports 'eth0'
option stp '1'
config interface 'lan'
option device 'br-lan'
option proto 'static'
option ipaddr '192.168.99.1'
option netmask '255.255.254.0'
option ip6assign '60'
option stp '1'
list dns_search '<removed>'
config device
option name 'eth1'
config interface 'wan'
option device 'eth1'
option proto 'dhcp'
option hostname '<removed>'
option clientid '<removed>'
config interface 'wan6'
option proto '6in4'
option username '<removed>'
option peeraddr '<removed>'
option ip6addr '<removed>'
option password '<removed>'
option tunnelid '<removed>'
list ip6prefix '<removed>/48'
list ip6prefix '<removed>/64'
config interface 'wg0'
option proto 'wireguard'
option private_key '<removed>'
option listen_port '<removed>'
list addresses '10.99.1.1/24'
list addresses 'fd99:99:1:1::1/64'
option device 'eth1'
config wireguard_wg0
option public_key '<removed>'
option description '<removed>'
option preshared_key '<removed>'
option route_allowed_ips '1'
list allowed_ips '10.99.1.2/32'
list allowed_ips 'fd99:99:1:1::2/128'
config route
option interface 'lan'
option target '192.168.98.0'
option netmask '255.255.255.224'
option gateway '192.168.99.10'
package dhcp
config dhcp 'lan'
option interface 'lan'
option dhcpv4 'server'
option start '128'
option limit '96'
option force '1'
option leasetime '1h'
option ra_management '2'
option ndp 'hybrid'
option ra 'server'
option dhcpv6 'server'
list domain '<removed>'
list ra_flags 'other-config'
list dhcp_option '6,192.168.99.1'
list dhcp_option '6,fd99:99:1::1'
list dns 'fd99:99:1::1'
config dhcp 'wan6'
option ndp 'relay'
option interface 'wan6'
option start '100'
option limit '150'
option leasetime '12h'
option ignore '1'
list ra_flags 'none'
config dhcp 'wan'
option interface 'wan'
option dhcpv4 'disabled'
option ignore '1'
list ra_flags 'none'
config odhcpd 'odhcpd'
option leasefile '/tmp/hosts/odhcpd'
option loglevel '4'
option maindhcp '1'
option leasetrigger '/usr/lib/unbound/odhcpd.sh'
config host
option dns '1'
option mac '52:54:00:80:7c:94'
option name 'ubuntuserver01'
option ip '192.168.99.103'
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1492/uhttpd
tcp 0 0 0.0.0.0:53 0.0.0.0:* LISTEN 2621/unbound
tcp 0 0 0.0.0.0:53 0.0.0.0:* LISTEN 2621/unbound
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1408/sshd -D [liste
tcp 0 0 192.168.99.1:8088 0.0.0.0:* LISTEN 10801/asterisk
tcp 0 0 127.0.0.1:8953 0.0.0.0:* LISTEN 2621/unbound
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN 1492/uhttpd
tcp 0 0 0.0.0.0:5060 0.0.0.0:* LISTEN 10801/asterisk
tcp 0 0 :::80 :::* LISTEN 1492/uhttpd
tcp 0 0 :::53 :::* LISTEN 2621/unbound
tcp 0 0 :::53 :::* LISTEN 2621/unbound
tcp 0 0 :::22 :::* LISTEN 1408/sshd -D [liste
tcp 0 0 ::1:8953 :::* LISTEN 2621/unbound
tcp 0 0 :::443 :::* LISTEN 1492/uhttpd
udp 0 0 0.0.0.0:16126 0.0.0.0:* -
udp 0 0 0.0.0.0:5060 0.0.0.0:* 10801/asterisk
udp 0 0 192.168.99.1:4569 0.0.0.0:* 10801/asterisk
udp 0 0 0.0.0.0:53 0.0.0.0:* 2621/unbound
udp 0 0 0.0.0.0:53 0.0.0.0:* 2621/unbound
udp 0 0 0.0.0.0:67 0.0.0.0:* 596/odhcpd
udp 0 0 :::16126 :::* -
udp 0 0 fd99:99:1::1:4569 :::* 10801/asterisk
udp 0 0 :::547 :::* 596/odhcpd
udp 0 0 :::53 :::* 2621/unbound
udp 0 0 :::53 :::* 2621/unbound
udp 0 0 :::123 :::* 2760/ntpd
raw 0 0 ::%2533610240:58 :::* 58 596/odhcpd
Active UNIX domain sockets (only servers)
Proto RefCnt Flags Type State I-Node PID/Program name Path
unix 2 [ ACC ] STREAM LISTENING 17780 10801/asterisk /var1/run/asterisk/asterisk.ctl
unix 2 [ ACC ] STREAM LISTENING 244 249/ubusd /var/run/ubus/ubus.sock
trendy
September 15, 2021, 1:42pm
6
I would add
option dhcpv4 'disabled'
option dhcpv6 'disabled'
under both wan and wan6. Also remove all the unnecessary options from wan6, like start, limit, ndp, etc.
1 Like
Did the suggested changes with no difference.
Cheers,
trendy
September 15, 2021, 2:16pm
8
A couple of things that might help are to ignore DHCP requests with a static lease and use ignore in the ip field, or disable dynamic DHCP dynamicdhcp 0. By not assigning static lease for the mac of the wan interface, no IP will be assigned.
Actually DHCP, DHCPv6, RA and NDP should be disabled by default:
By the way, 192.168.99.1/255.255.254.0 looks weird.
So does that mean that I cannot disable dhcpv4 on the wan interface?
Sorry I have changed that to hide my original IP Adresses. Yes "99" would not work should be an even number (and is in reality ...)
