Yes, both SFP+ ports are connected to the host. 

Host side, the ip addresses are:

`enp3s0f0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000`

`        inet 192.168.20.1  netmask 255.255.255.0  broadcast 0.0.0.0`

`        ether 7c:c2:55:7b:35:7e  txqueuelen 1000  (Ethernet)`

`        RX packets 4616  bytes 432264 (432.2 KB)`

`        RX errors 0  dropped 90  overruns 0  frame 0`

`        TX packets 2518  bytes 1371160 (1.3 MB)`

`        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0`

`enp3s0f1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9000`

`        inet 192.168.10.1  netmask 255.255.255.0  broadcast 0.0.0.0`

`        ether 7c:c2:55:7b:35:7f  txqueuelen 1000  (Ethernet)`

`        RX packets 1226  bytes 945608 (945.6 KB)`

`        RX errors 0  dropped 198  overruns 0  frame 0`

`        TX packets 15263  bytes 18973321 (18.9 MB)`

`        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0`

whereas N310 the interfaces are: 

`sfp0      Link encap:Ethernet  HWaddr 00:80:2F:34:A1:BD`

`          inet addr:192.168.10.2  Bcast:192.168.10.255  Mask:255.255.255.0`

`          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1`

`          RX packets:3403 errors:0 dropped:0 overruns:0 frame:0`

`          TX packets:1079 errors:0 dropped:0 overruns:0 carrier:0`

`          collisions:0 txqueuelen:1000`

`          RX bytes:869430 (849.0 KiB)  TX bytes:62857 (61.3 KiB)`

`sfp1      Link encap:Ethernet  HWaddr 00:80:2F:34:A1:BE`

`          inet addr:192.168.20.2  Bcast:192.168.20.255  Mask:255.255.255.0`

`          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1`

`          RX packets:3775 errors:0 dropped:0 overruns:0 frame:0`

`          TX packets:403 errors:0 dropped:0 overruns:0 carrier:0`

`          collisions:0 txqueuelen:1000`

`          RX bytes:338406 (330.4 KiB)  TX bytes:603205 (589.0 KiB)`

Both 192.168.20.2 and 192.168.10.2 can be pinged correctly.

“udpv“ protocol was a typo of mine. The output of cmd `$sudo firewall-cmd 
--list-ports` is:

`49152/udp`
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