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Shared connection with fixed IP with NetworkManager/dnsmasq
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simonbcn
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Joined: 01 Aug 2011
Posts: 63
Location: Terrassa, Barcelona, Spain

PostPosted: Tue Dec 08, 2015 12:54 am    Post subject: Shared connection with fixed IP with NetworkManager/dnsmasq Reply with quote

My PC has a dual LAN motherboard, one connected to the Internet router and the other to a media player.
I want assign a fixed IP to media player and it allows access to Internet through the other LAN.
I'm using NetworkManager, dhclient and dnsmasq. I've gotten the player access to the Internet but not assign a fixed IP.

/etc/NetworkManager/NetworkManager.conf
Code:
[main]
plugins=keyfile
dns=dnsmasq
no-auto-default=*


/etc/NetworkManager/system-connections/VTEN (shared connection / link enp7s0)
Code:
[connection]
id=VTEN
uuid=1a887e17-8d8b-460f-8cda-8ca22e5b2f28
type=ethernet
permissions=
secondaries=

[ethernet]
mac-address=1C:6F:65:35:4E:24
mac-address-blacklist=

[ipv4]
dns-search=
may-fail=false
method=shared

[ipv6]
dns-search=
method=ignore


/etc/NetworkManager/system-connections/Internet (Internet / link enp8s0)
Code:
[connection]
id=enp8s0 (Internet)
uuid=39559adb-4564-423a-805e-d12229f22845
type=ethernet
autoconnect=true
permissions=
secondaries=

[ethernet]
mac-address=1C:6F:65:35:4E:34
mac-address-blacklist=

[ipv4]
dns-search=
method=auto

[ipv6]
dns-search=
method=ignore


To activate dnsmasq as dhcp server I have added this file with the MAC of media player and the IP that I want to assign it.
/etc/NetworkManager/dnsmasq.d/servidor-dhcp
Code:
interface=enp7s0
dhcp-range=192.168.2.2,192.168.2.50
dhcp-host=00:06:DC:89:74:36,192.168.2.2


/etc/dhcp/dhclient.conf
Code:
alias {
  interface "enp7s0";
  fixed-address 192.168.2.1;
  option subnet-mask 255.255.255.0;
  option broadcast-address 192.168.2.255;
  option domain-name-servers 127.0.0.1;
}


systemctl status -l NetworkManager
Code:
● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib64/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: active (running) since mar 2015-12-08 01:51:15 CET; 59s ago
 Main PID: 25570 (NetworkManager)
   CGroup: /system.slice/NetworkManager.service
           ├─25570 /usr/sbin/NetworkManager --no-daemon
           ├─25579 /sbin/dhclient -d -q -sf /usr/libexec/nm-dhcp-helper -pf /var/run/dhclient-enp8s0.pid -lf /var/lib/NetworkManager/dhclient-3382e7d4-c7a1-41a1-9b12-a7fa20bb3aa4-enp8s0.lease -cf /var/lib/NetworkManager/dhclient-enp8s0.conf enp8s0
           └─26336 /usr/sbin/dnsmasq --no-resolv --keep-in-foreground --no-hosts --bind-interfaces --pid-file=/var/run/NetworkManager/dnsmasq.pid --listen-address=127.0.0.1 --conf-file=/var/run/NetworkManager/dnsmasq.conf --cache-size=400 --proxy-dnssec --conf-dir=/etc/NetworkManager/dnsmasq.d

dic 08 01:51:21 localhost NetworkManager[25570]: <info>  Executing: /sbin/iptables --table filter --delete FORWARD --destination 10.42.0.0/255.255.255.0 --out-interface enp7s0 --match state --state ESTABLISHED,RELATED --jump ACCEPT
dic 08 01:51:21 localhost NetworkManager[25570]: <info>  Executing: /sbin/iptables --table filter --delete FORWARD --source 10.42.0.0/255.255.255.0 --in-interface enp7s0 --jump ACCEPT
dic 08 01:51:21 localhost NetworkManager[25570]: <info>  Executing: /sbin/iptables --table filter --delete FORWARD --in-interface enp7s0 --out-interface enp7s0 --jump ACCEPT
dic 08 01:51:21 localhost NetworkManager[25570]: <info>  Executing: /sbin/iptables --table filter --delete FORWARD --out-interface enp7s0 --jump REJECT
dic 08 01:51:21 localhost NetworkManager[25570]: <info>  Executing: /sbin/iptables --table filter --delete FORWARD --in-interface enp7s0 --jump REJECT
dic 08 01:51:21 localhost NetworkManager[25570]: <info>  Executing: /sbin/iptables --table filter --delete INPUT --in-interface enp7s0 --protocol udp --destination-port 67 --jump ACCEPT
dic 08 01:51:21 localhost NetworkManager[25570]: <info>  Executing: /sbin/iptables --table filter --delete INPUT --in-interface enp7s0 --protocol tcp --destination-port 67 --jump ACCEPT
dic 08 01:51:21 localhost NetworkManager[25570]: <info>  Executing: /sbin/iptables --table filter --delete INPUT --in-interface enp7s0 --protocol udp --destination-port 53 --jump ACCEPT
dic 08 01:51:21 localhost NetworkManager[25570]: <info>  Executing: /sbin/iptables --table filter --delete INPUT --in-interface enp7s0 --protocol tcp --destination-port 53 --jump ACCEPT
dic 08 01:51:26 localhost NetworkManager[25570]: <info>  startup complete


This is the result:
Code:
ip a                           
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
.....
2: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 1c:6f:65:35:4e:24 brd ff:ff:ff:ff:ff:ff
    inet 10.42.0.1/24 brd 10.42.0.255 scope global enp7s0
       valid_lft forever preferred_lft forever
    inet6 fe80::1e6f:65ff:fe35:4e24/64 scope link tentative
       valid_lft forever preferred_lft forever
3: enp8s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 1c:6f:65:35:4e:34 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.2/24 brd 192.168.1.255 scope global dynamic enp8s0
       valid_lft 86401sec preferred_lft 86401sec
    inet6 fe80::1e6f:65ff:fe35:4e34/64 scope link
       valid_lft forever preferred_lft forever

The enp7s0 link and mediaplayer have a ¿random? IP ¿assigned by NetworkManager?. Neither dnsmasq (dhcp) nor dhclient (with enp7s0) do their job.
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