I need to create a GRE tunnel from a client to a server. This is my setup.
Setup:
________________________________ _________________________________ ______________________________
|Server | | |Router | | |Client | |
|-------- | |-------- | |-------- |
| wan (244.244.244.1/24) -|------|- wan (244.244.244.20/24) | | |
| | | | | |
| | | lan (192.168.178.0/24) -|------|- lan (192.168.178.22/24) |
| | --------------------------------- | |
| | | |
| to_client (10.10.10.1/24) -|---------------------------------------------|- to_server |
-------------------------------- ------------------------------
It basically works, but I am unable to get an IP on the client's 'to_server' tunnel interface, because dhclient is not supporting this type of interface.
No isc-dhcp package seems to support it. I usually use isc-dhcp-server as a DHCP-Server, but need to use dnsmasq for this special setup.
$ dhclient -v to_server
Unsupported device type 778 for "to_server"
Is there any other method/program to request an IP from a DHCP-server
Additional information from here until the end:
The server and the client are both LXContainers running debian jessie and the host of these containers is an Ubuntu 16.04. The router has an entry of the client as 'exposed host'
The strange thing is, that I am able to ping the server's tunnel interface address.
$ ping -c3 10.10.10.1
PING 10.10.10.1 (10.10.10.1) 56(84) bytes of data.
64 bytes from 10.10.10.1: icmp_seq=1 ttl=63 time=1.38 ms
64 bytes from 10.10.10.1: icmp_seq=2 ttl=63 time=0.703 ms
64 bytes from 10.10.10.1: icmp_seq=3 ttl=63 time=0.784 ms
--- 10.10.10.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.703/0.957/1.386/0.306 ms
ifconfig Server (stripped to the minimum)
wan Link encap:Ethernet Hardware Adresse d6:d1:57:b5:a9:47
inet Adresse:244.244.244.1 Bcast:0.0.0.0 Maske:255.255.255.0
inet6-Adresse: fe80::d4d1:57ff:feb5:a947/64 Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
to_client Link encap:UNSPEC Hardware Adresse F4-F4-F4-01-30-30-3A-30-00-00-00-00-00-00-00-00
inet Adresse:10.10.10.1 P-z-P:10.10.10.1 Maske:255.255.255.0
UP PUNKTZUPUNKT RUNNING NOARP MTU:1476 Metrik:1
ifconfig client (stripped to the minimum)
lan Link encap:Ethernet Hardware Adresse 82:63:16:cc:12:88
inet Adresse:192.168.178.22 Bcast:0.0.0.0 Maske:255.255.255.0
inet6-Adresse: fe80::8063:16ff:fecc:1288/64 Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
to_server Link encap:UNSPEC Hardware Adresse C0-A8-B2-16-30-30-3A-30-00-00-00-00-00-00-00-00
UP PUNKTZUPUNKT RUNNING NOARP MTU:1476 Metrik:1
Tunnel interfaces
$ ip tunnel show to_client
to_client: gre/ip remote 244.244.244.20 local 244.244.244.1 ttl 255
$ ip tunnel show to_server
to_server: gre/ip remote 244.244.244.1 local 192.168.178.22 ttl 255
dnsmasq.conf
# wan-network
dhcp-range=wan,244.244.244.25,244.244.244.30,2m
# tunnel-network
dhcp-range=to_client,10.10.10.2,10.10.10.10,2m
# netmask /24
dhcp-option=1,255.255.255.0
# this is the router
dhcp-host=9c:c7:a6:XX:XX:XX,244.244.244.20,2m
# disable DNS
port=0
