How to add a gateway to eh0?

eth0 eth1 are in the same IP segment. but only eth1 has gateway. so I think this is why I can't connect to the IP of eth0 with putty. I can connect to eth1 with putty.

[root@ip-172-26-26-60 ~]# netstat -nr

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
172.26.26.0     0.0.0.0         255.255.255.192 U         0 0          0 eth0
172.26.26.0     0.0.0.0         255.255.255.192 U         0 0          0 eth1
0.0.0.0         172.26.26.1     0.0.0.0         UG        0 0          0 eth1