Engineering Notes

---

SWITCH LOGIN:

username: perched
!
password: perched1234!@#$

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EXT IP: 10.0.50.1/24

INT IP: 172.16.50.1/24

SENSOR IP: 172.16.50.100

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DHCP SETUP:

ip dhcp excluded-address 10.0.50.0 10.0.50.1
!
ip dhcp pool 50
!
network 10.0.50.0 255.255.255.252
!
default-router 10.0.50.1
!
dns-server 192.168.2.1

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VLAN SETUP:

VLAN 150
name TEAM50
interface vlan150
description TEAM50
ip address 10.0.50.1 255.255.255.252

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CentOS SETUP:

ip addr:

ip a show dev enp0s31f6
ip -4 addr
ip a add x.x.x.x/24 dev xx
ip a del x.x.x.x/24 dev xx

ip link:

ip link show dev xx
ip -s link
ip link set dev xxx up
ip link set dev xxx down
ip link set enpxxxx promisc on

ip router

ip neigh
ip neigh show dev enp0s3

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Disable IPv6:

sudo vi /etc/sysctl.conf

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

sudo sysctl -p
sudo systemctl restart network

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FIREWALLD:

add open port:

sudo firewall-cmd --zone=public --add-port=####/tcp --permanent

sudo firewall-cmd --reload

remove open port:

sudo firewall-cmd --zone=public --remove-port=####/tcp --permanent
sudo firewall-cmd --reload

Commit Changes:

sudo firewall-cmd --runtime-to-permanent

Socket status:

ss -lnt  #<---(replacing netstat)