He configurado un servidor MaaS con eth0acceso a Internet y eth1un conmutador interno que conecta los nodos MaaS. Puedo encargar e implementar nodos en Trusty Ubuntu, pero esos nodos solo pueden funcionar nslookupen servidores externos, pero no ping. Sospecho que la puerta de enlace predeterminada puede estar mal configurada, pero no tengo idea de cuál debería ser si lo está.
Alguna idea de cuál debería ser la configuración correcta para esta instancia:
Servidor MaaS
graeme@MAAS:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:15:5d:00:07:04
inet addr:192.168.0.4 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::215:5dff:fe00:704/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:933 errors:0 dropped:3 overruns:0 frame:0
TX packets:796 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:814964 (814.9 KB) TX bytes:81546 (81.5 KB)
eth1 Link encap:Ethernet HWaddr 00:15:5d:00:07:05
inet addr:10.1.1.100 Bcast:10.1.1.255 Mask:255.255.255.0
inet6 addr: fe80::215:5dff:fe00:705/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:14 errors:0 dropped:0 overruns:0 frame:0
TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:999 (999.0 B) TX bytes:1842 (1.8 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:13351 errors:0 dropped:0 overruns:0 frame:0
TX packets:13351 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3635226 (3.6 MB) TX bytes:3635226 (3.6 MB)
virbr0 Link encap:Ethernet HWaddr 92:7f:58:38:c8:79
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
graeme@MAAS:~$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
10.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
graeme@MAAS:~$ sudo cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.0.4
netmask 255.255.255.0
gateway 192.168.0.1
dns-nameservers 10.1.1.100 192.168.0.1
auto eth1
iface eth1 inet static
address 10.1.1.100
netmask 255.255.255.0
graeme@MAAS:~$ nslookup google.com
Server: 10.1.1.100
Address: 10.1.1.100#53
Non-authoritative answer:
Name: google.com
Address: 216.58.198.110
graeme@MAAS:~$ ping google.com
PING google.com (216.58.198.110) 56(84) bytes of data.
64 bytes from lhr25s07-in-f14.1e100.net (216.58.198.110): icmp_seq=1 ttl=54 time=19.9 ms
64 bytes from lhr25s07-in-f14.1e100.net (216.58.198.110): icmp_seq=2 ttl=54 time=18.6 ms
^C
--- google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 18.651/19.324/19.997/0.673 ms
Servidor de nodo
ubuntu@node-1-tidy-balls:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:15:5d:00:07:03
inet addr:10.1.1.151 Bcast:10.1.1.255 Mask:255.255.255.0
inet6 addr: fe80::215:5dff:fe00:703/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1809 errors:0 dropped:0 overruns:0 frame:0
TX packets:256 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:151375 (151.3 KB) TX bytes:35520 (35.5 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1184 (1.1 KB) TX bytes:1184 (1.1 KB)
ubuntu@node-1-tidy-balls:~$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.1.1.100 0.0.0.0 UG 0 0 0 eth0
10.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
ubuntu@node-1-tidy-balls:~$ sudo cat /etc/network/interfaces
auto lo
iface lo inet loopback
dns-nameservers 10.1.1.100
dns-search maas
auto eth0
iface eth0 inet static
gateway 10.1.1.100
address 10.1.1.151/24
mtu 1500
ubuntu@node-1-tidy-balls:~$ nslookup google.com
Server: 10.1.1.100
Address: 10.1.1.100#53
Non-authoritative answer:
Name: google.com
Address: 216.58.198.110
ubuntu@node-1-tidy-balls:~$ ping google.com
PING google.com (216.58.198.110) 56(84) bytes of data.
^C
--- google.com ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4032ms
El ping en el Nodo tuvo que cancelarse porque no devolvió nada después de un minuto.
Respuesta1
En su servidor MaaS...
Primero agregue las reglas a su interfaz, publíquelas hacia arriba y hacia abajo.
auto eth1
iface eth1 inet static
address 10.1.1.100
netmask 255.255.255.0
post-up iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source 192.168.0.4
post-down iptables -t nat -D POSTROUTING -o eth0 -j SNAT --to-source 192.168.0.4
Entonces necesitas habilitar el reenvío de IP. Edite /etc/sysctl.confagregando la siguiente línea.
net.ipv4.ip_forward=1
Eso tendrá efecto al reiniciar, pero también puedes activarlo sobre la marcha emitiendo...
echo 1 > /proc/sys/net/ipv4/ip_forward