[CentOS] C7, ipmi, NIC2, still fighting

This is that system with the missing management port, and I'm still
fighting it. Everything *looks* right:

3: enp6s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP group default qlen 1000
    link/ether 00:25:90:0a:42:87 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.100/24 brd 192.168.0.255 scope global enp6s0

ip route
192.168.0.0/24 dev enp6s0 proto kernel scope link src 192.168.0.100

and  ipmitool lan print
IP Address Source       : Static Address
IP Address              : 192.168.0.132
Subnet Mask             : 255.255.255.0
MAC Address             : 00:25:90:0a:42:92
<...>
Default Gateway IP      : 192.168.0.100
Default Gateway MAC     : 00:25:90:0a:42:87

I can ping 192.168.0.1... yet I'm getting martians on the real network.

There's no firewall on enp6s0. Any clues as to what I'm missing?

       mark "No illudium Q-36 space modulators, please"