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Lab 2

1. 2.

1. netconfig , ifconfig , netstat , traceroute , route , ping , iptables , service , nslookup netconfig IP ,Netmask Gateway GUI # netconfig

IP ,Netmask Gateway

#service network Restart restart network

ifconfig Network interface ip server # ifconfig Network Interface

# ifconfig eth0 192.168.1.66 Ip Address eth0

Netstat # netstat -lnt # netstat -lnu

# netstat -rn Kernel routing table

# netstat -rc routing cached table

# netstat -ac connection

# netstat -s packet

# netstat -i interface

Traceroute (router)traceroute traceroute #traceroute www.google.com www.google.com

route

- Route Table

# route Route Table

# route add -net 202.168.0.0/8 gw 10.1.1.1 IP Gateway route # route del -net 202.168.0.0/8 gw 10.1.1.1 IP Gateway route

Ping - ping # ping www.google.com c 3 ping (count) 3

Iptables (filter)

Firewall network network network Internet Linux Firewall IPTABLES IPTABLES

iptables

iptables [table] (rule)

[table] 3 (Filter table) (Nat table) (Mangle table) iptables -t nat

iptables -A INPUT (INPUT chain)

(match) (source ip address) 1.2.3.4

(match) (action) (source ip address) 1.2.3.4 (DROP packet )

3

1.Filter Table

(filter table) 2.20 routing decision

2.Mangle Table TOS, TTL, MARK packet filtering DNAT, SNAT Masquerading

3.Nat Table (network address translation) (source ip address, destination ip address)

packet filtering

#iptables L ( built-in chain)

-A (chain) (Append rule) # iptables -A INPUT -p ALL -i eth0 -j ACCEPT

service (service) start stop restart #service [service name] start/stop/restart #service network restart

service #service status-all

nslookup (coommand) Command prompt Dos DNS DNS (resolve )

ARP / arp table (Address Result Protocol) IP Physical Address #arp a

2. config config IP Address ,Hostname ,Security Hostname - #hostname hostname - #vi /etc/sysconfig/network HOSTNAME= HOSTNAME=TEST555 save wq - Restart 1 - login #hostname hostname

/etc/resolv.conf /etc/resolv.conf configuration name resolver format text keyword keyword 3 : domain keyword local domain name search keyword host nameswrver keyword IP address name server

IP nameserver

/etc/host.conf /etc/host.conf IP

name resolver /etc/hosts IP address host /etc/hosts nameserver

/etc/hosts IP address lan domain name server IP address update IP address IP loopback interface local hosts

207.48.64.90 sra1.sra.cat.or.th sra1 ( local network)

/etc/securetty /etc/securetty root tty devices /etc/securetty login ( /bin/login) list tty devices root

1.

#service status-all service

2. Network Address 10.1.5.0/10 Subnet subnet /10 = 11111111.11000000.0000000.0000000 = 255.192.0.0 22-2 = 2 Subnet Host Subnet subnet = 11111111.11000000.0000000.0000000 24-2 = 22 Host Subnet 222- 2 = 4,194,302 Host Subnet 00001010.01000000.00000000.00000000 => 10.64.0.0 00001010.10000000.00000000.00000000 => 10.128.0.0

10.64.0.0 => 10.64.0.1 to 10.127.255.254 10.128.0.0 => 10.128.0.1 to 10.191.255.254