HS="/etc/hostname"
rm $HS; touch $HS
echo "L-RTR-A" >> $HS
H="/etc/hosts"; rm $H; touch $H
echo -e "# ${H} file.\n# Configured by Maxim\n\n" >> $H
echo -e "# Default values\n127.0.0.1\tlocalhost\n::1\tip6-localhots ip6-loopback\nff02::1\tip6-allnodes\nff02::2\tip6-allrouters\n" >> $H
echo -e "# Work values\n172.16.20.10\tl-srv l-srv.skill39.wsr\n10.10.10.1\tl-fw l-fw.skill39.wsr\n172.16.50.2\tl-rtr-a l-rtr-a.skill39.wsr\n172.16.55.2\tl-rtr-b l-rtr-b.skill39.wsr\n172.16.200.61\tl-cli-b l-cli-b.skill39.wsr\n20.20.20.5\tout-cli out-cli.skill39.wsr\n20.20.20.100\tr-fw r-fw.skill39.wsr\n192.168.20.10\tr-srv r-srv.skill39.wsr\n192.168.10.2\tr-rtr r-rtr.skill39.wsr\n192.168.100.100\tr-cli r-cli.skill39.wsr">> $H 
echo -e "10.10.10.10\tisp" >> $H
echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
iptables -F 
apt-cdrom add

apt install frr tcpdump ssh nfs-common network-manager curl lynx net-tools vim bind9utils cifs-utils -y

sed -ie "s/^hosts:\t*/hosts:\t\tdns files [NOTFOUND=return] # old:/" /etc/nsswitch.conf
SSHC="/etc/ssh/sshd_config"
cp $SSHC $SSHC.old
sed -ie 's/#PermitRoot.*/PermitRootLogin yes/' $SSHC

nmcli con add con-name ens192 ifname ens192 autoconnect yes type ethernet ip4 172.16.50.2/30 gw4 172.16.50.1
nmcli con mod ens192 +ipv4.dns 172.16.20.10 +ipv4.dns 192.168.20.10 +ipv4.dns-search "skill39.wsr"
nmcli con up ens192 ifname ens192
nmcli con add con-name ens224 ifname ens224 autoconnect yes type ethernet ip4 172.16.100.1/24 
nmcli con mod ens224 +ipv4.dns 172.16.20.10 +ipv4.dns 192.168.20.10 +ipv4.dns-search "skill39.wsr"
nmcli con up ens224 ifname ens224

systemctl stop frr; systemctl disable frr;
sed -ie 's/ospfd=no/ospfd=yes/' /etc/frr/daemons; 
sed -ie 's/zebra=no/zebra=yes/' /etc/frr/daemons; 
systemctl start frr; systemctl enable frr;

vtysh
conf t
	router ospf
		network 172.16.50.0/30 area 0
		network 172.16.100.0/24 area 0
		passive-interface esn224
		exit
	exit
write
exit

apt install isc-dhcp-server -y

sed -ie "s/INTERFACESv4=\"\"/INTERFACESv4=\"ens192 ens224\"/" /etc/default/isc-dhcp-server
DHC="/etc/dhcp/dhcpd.conf"
rm $DHC; touch $DHC
echo -e "# /etc/dhcp/dhcpd.conf file\n# L-RTR-A\ndefault-lease-time 600;\nmax-lease-time 7200;\n\nddns-update-style interim;\nupdate-static-leases on;\nzone skill39.wsr. { primary 172.16.20.10; }\nzone 16.172.in-addr.arpa. { primary 172.16.20.10; }\nauthoritative;\n\noption domain-name \"skill39.wsr\";\noption domain-name-servers 172.16.20.10, 192.168.20.10;\n\nsubnet 172.16.50.0 netmask 255.255.255.252 {}\nsubnet 172.16.100.0 netmask 255.255.255.0 {\n\trange 172.16.100.65 172.16.100.75;\n\toption routers 172.16.100.1;\n}\nsubnet 172.16.200.0 netmask 255.255.255.0 {\n\trange 172.16.200.65 172.16.200.75;\n\toption routers 172.16.200.1;\n}\nhost lclib {\n\thardware ethernet 00:0C:29:1D:2C:06;\n\tfixed-address 172.16.200.61;\n}\n" >> $DHC
systemctl start isc-dhcp-server && systemctl enable isc-dhcp-server

systemctl disable chronyd ; systemctl stop chronyd
shutdown -r 0