Default Configuration of the Network on FreeBSD is DHCP. Let me show you how to change or set IP addresses from Dynamic to Static. i will take this example from my FreeBSD VM. but that should work also for bare metal servers.
My  Network Configuration i :
root@FreeBSD12:~ # ifconfig em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=81009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWFILTER> ether 00:0c:29:ac:76:78 inet6 fe80::20c:29ff:feac:7678%em0 prefixlen 64 scopeid 0x1 inet 192.168.65.162 netmask 0xffffff00 broadcast 192.168.65.255 media: Ethernet autoselect (1000baseT <full-duplex>) status: active nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6> inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2 inet 127.0.0.1 netmask 0xff000000 groups: lo nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> root@FreeBSD12:~ #
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Netmask : This 0xffffff00 is written in dotted-quad notation as 255.255.255.0
Find My gateway
root@FreeBSD12:~ # netstat -rn Routing tables Internet: Destination Gateway Flags Netif Expire default 192.168.65.2 UGS em0 127.0.0.1 link#2 UH lo0 192.168.65.0/24 link#1 U em0 192.168.65.162 link#1 UHS lo0
DNS Server
Because its an VM, the DNS server is the same as the gateway. in your case my DNS is something else.
root@FreeBSD12:~ # cat /etc/resolv.conf # Generated by resolvconf search localdomain nameserver 192.168.65.2
The actual status of rc.conf file.
Lets change the Ip from DHCP to static ip 192.168.65.10 / default gateway is 192.168.65.2 with adding the two lines to rc.conf
ifconfig_em0="inet 192.168.65.10 netmask 255.255.250.0" defaultrouter="192.168.65.2"
Restart the network Services with.
/etc/netstart
Waaw cool !!
Connect from Other Server and see if the new Ip working
➤ ssh root@192.168.65.10 Warning: Permanently added '192.168.65.10' (RSA) to the list of known hosts. Password for root@FreeBSD12.osradar.local: Last login: Tue Dec 11 11:55:04 2018 from 192.168.65.1 FreeBSD 12.0GENERIC Welcome to FreeBSD!
Enjoy
