route an IPv4 /32 to a different interface

Sun, 15 Dec 2019 11:58:58 -0800 

Hi,

I have this setup :

em3: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 
        index 4 priority 0 llprio 3
        media: Ethernet autoselect (1000baseSX full-duplex)
        status: active
        inet6 fe80::aa9:b803:8a7a:ca72%em3 prefixlen 64 scopeid 0x4
        inet 172.16.0.254 netmask 0xffffff00 broadcast 172.16.0.255
em4: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr
        index 5 priority 0 llprio 3
        media: Ethernet autoselect (1000baseSX full-duplex)
        status: active
        inet 172.16.0.249 netmask 0xfffffffc broadcast 172.16.0.251
        inet6 fe80::29ae:98d:f238:fd68%em4 prefixlen 64 scopeid 0x5

I have a computer with IPv4 address 172.16.0.248 connected to em3.
When I try to ping it, obviously it goes to em4.

How can I route 172.16.0.248 through em3 ?

I tried with :
* route add 172.16.0.248/32 172.16.0.254 -iface em3
* route add 172.16.0.248/32 -llinfo -link -static -iface em3
but without luck.

Thank you in advance,
Denis

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