I am trying to route traffic through a specific interface based on its destination.
OS is CentOS 7.
I am setting up a mini MPI farm where I have 2 slave workers and one master. The master and slaves use the built-in nic (em1) to communicate locally through a switch (this way all of the workers have "local" ips 192.168.1.*).
I then have a secondary nic (p2p1) that is connected to my router for external internet traffic.
As things are currently setup, I am able to ssh into each worker without problem but I cannot communicate with the internet (ping 8.8.8.8 states that it cannot access google's server).
From what I have searched for, I haven't been able to find a solution for this specific problem but I feel it is a simple fix...
typing route yields
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default Linksys01356 0.0.0.0 UG 100 0 0 em1
default gateway 0.0.0.0 UG 101 0 0 p2p1
10.11.230.0 0.0.0.0 255.255.255.0 U 101 0 0 p2p1
192.168.1.0 0.0.0.0 255.255.255.0 U 100 0 0 em1
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
and typying iptables --list gives
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT udp -- anywhere anywhere udp dpt:domain
ACCEPT tcp -- anywhere anywhere tcp dpt:domain
ACCEPT udp -- anywhere anywhere udp dpt:bootps
ACCEPT tcp -- anywhere anywhere tcp dpt:bootps
Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere 192.168.122.0/24 ctstate RELATED,ESTABLISHED
ACCEPT all -- 192.168.122.0/24 anywhere
ACCEPT all -- anywhere anywhere
REJECT all -- anywhere anywhere reject-with icmp-port-unreachable
REJECT all -- anywhere anywhere reject-with icmp-port-unreachable
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ACCEPT udp -- anywhere anywhere udp dpt:bootpc
Ideally I would like all the MPI computers (master and slaves) to communicate using em1 and the master pull things from outside the local network on p2p1.
If it helps, the master IP is 10.11.230.43 for outside access and 192.168.1.143 on the local network, while one slave has the ip address 192.168.1.118.
If I am missing any other info please let me know.
Thank you