Adding route
to all the slaves
which reside on a private network to communicate with External Server
directly using an EDGE
node using Interface Forwarding
.
NOTE : Below testing was done on RHEL 6.6
What we are trying to do.
- All the slave nodes will send their data to Edge nodes on a private interface.
- Edge Node will take the data arriving on the
private
interface and forward it over a external interface.
NOTE: below I have used slave
s for all the nodes which are communicating with EDGE
, in the this case making EDGE
as the master
which acts like a router
.
Datanodes ifconfig
Slaves will only run on Private network.
192.168.0.11
akaeth1
Private Interface.
Here is the ifconfig
.
[root@slave-node ~]# ifconfig
eth0 Link encap:Ethernet HWaddr
inet addr:192.168.0.8 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::21d:d8ff:feb7:1efe/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:131581 errors:0 dropped:0 overruns:0 frame:0
TX packets:148636 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:11583580 (11.0 MiB) TX bytes:35866144 (34.2 MiB)
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:245626 errors:0 dropped:0 overruns:0 frame:0
TX packets:245626 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:286415155 (273.1 MiB) TX bytes:286415155 (273.1 MiB)
Edge Node ifconfig
172.14.14.214
akaeth0
External Interface192.168.0.11
akaeth1
Private Interface.
Here is the ifconfig
.
[root@edge-node ~]# ifconfig
eth0 Link encap:Ethernet HWaddr
inet addr:172.14.14.214 Bcast:172.14.14.255 Mask:255.255.255.0
inet6 addr: fe80::21d:d8ff:feb7:1f7b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:908442 errors:0 dropped:0 overruns:0 frame:0
TX packets:235173 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:77363514 (73.7 MiB) TX bytes:33167098 (31.6 MiB)
eth1 Link encap:Ethernet HWaddr
inet addr:192.168.0.11 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::21d:d8ff:feb7:1f7a/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:210510 errors:0 dropped:0 overruns:0 frame:0
TX packets:177170 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:61583138 (58.7 MiB) TX bytes:16125613 (15.3 MiB)
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:13799253 errors:0 dropped:0 overruns:0 frame:0
TX packets:13799253 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:27734863794 (25.8 GiB) TX bytes:27734863794 (25.8 GiB)
[root@edge-node ~]#
Configuration.
- Create
FORWARD
er on the Edge node. - Create
route
on all theslave
. - Update
/etc/hosts
onslave
nodes.
1. Create FORWARD
er on the Edge
node.
- If you haven’t already enabled forwarding in the kernel, do so.
- Open
/etc/sysctl.conf
and uncommentnet.ipv4.ip_forward = 1
- Then execute
$ sudo sysctl -p
- Add the following rules to
iptables
Commands.
[root@edge-node ~]# iptables -t nat -A POSTROUTING --out-interface eth0 -j MASQUERADE
[root@edge-node ~]# iptables -A FORWARD --in-interface eth1 -j ACCEPT
2. Create route
on all the slave
.
Here is the command to add the route in slaves
.
[root@datanode ~]# route add -net 172.0.0.0 netmask 255.0.0.0 gw 192.168.0.11 eth0
We are tell all the traffic trying to go to 172.x.x.x
will have to use 192.168.0.11
as the gateway. Which is the Private
Interface on the Edge
Node.
3. Update /etc/hosts
on slave
nodes.
And then we update the /etc/hosts
file with the direct IP
of External Server 172.14.14.174
, as slave
node now should be able to communicate to the External Server.
[root@slave-nodes ~]# ping 172.14.14.174
PING 172.14.14.174 (172.14.14.174) 56(84) bytes of data.
64 bytes from 172.14.14.174: icmp_seq=1 ttl=127 time=1.02 ms
64 bytes from 172.14.14.174: icmp_seq=2 ttl=127 time=1.04 ms
64 bytes from 172.14.14.174: icmp_seq=3 ttl=127 time=1.03 ms
^C
--- 172.14.14.174 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2892ms
rtt min/avg/max/mdev = 1.020/1.033/1.049/0.038 ms
[root@slave-nodes ~]# ping 172.14.14.141
PING 172.14.14.141 (172.14.14.141) 56(84) bytes of data.
64 bytes from 172.14.14.141: icmp_seq=1 ttl=127 time=0.968 ms
64 bytes from 172.14.14.141: icmp_seq=2 ttl=127 time=1.01 ms
64 bytes from 172.14.14.141: icmp_seq=3 ttl=127 time=3.73 ms
^C
--- 172.14.14.141 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2350ms
rtt min/avg/max/mdev = 0.968/1.906/3.732/1.291 ms