Psychologist Heddy López Díaz, accompaniment leader - MAIE School of Education of the Minuto de Dios University Corporation (Uniminuto) discussed the most. Linux Network Configuration. Linux TCP/IP Network Configuration Files. File. Description/etc/resolv. List DNS servers for internet domain name resolution. Manual page for: /etc/resolv. Lists hosts to be resolved locally (not by DNS). Manual page for: /etc/hosts/etc/nsswitch. List order of host name search. Typically look at local files, then NIS server, then DNS server. Manual page for: /etc/nsswitch. Red Hat/Fedora/Cent. OS: /etc/sysconfig/network. Specify network configuration. Static IP, DHCP, NIS, etc. How To Enable Dhcp On Microsoft Loop Back Adapter ProblemsHow To Enable Dhcp On Microsoft Loop Back Adapter Problem HamachiRed Hat/Fedora/Cent. OS: /etc/sysconfig/network- scripts/ifcfg- device. Specify TCP network information. Ubuntu/Debian: /etc/network/interfaces. Specify network configuration and devices. Static IP and info, DHCP, etc. Conteúdo desativado do Windows Server 2003, Windows Server 2003 SP1 e SP2 e Windows Server 2003 R2.O conteúdo solicitado já foi desativado. Ele está disponível. If using DHCP client, this will automatically. ISP and loaded into this file as part of the DHCP protocol. If using a static. IP address, ask the ISP or check another machine on your network. Your. second port is eth. Choose one of three options. Direct internet connection. Manual proxy configuration (specify proxy and port). Automatic proxy configuration (give URL). Assigning an IP address. Computers may be assigned a static IP address or assigned one dynamically. Handles all interfaces. Configure for Static IP or DHCP client. See format below. Implied if IP addresses are specified. Shut down interfacearp. Enable ARP protocol on this interface. Allow ARP to detect the addresses of computer hosts attached to the network.- arp. Disable ARP protocol on this interfacepromisc. Enable promiscuous mode. Receive all packets on the network not just those destined for this interface.- promisc. Disable promiscuous mode. Specify the Maximum Transfer Unit (MTU) of the interface. The MTU is the maximum number of octets the interface is able to handle in a single transaction. Defaults: Ethernet: 1. SLIP: 2. 96broadcast XXX. XXX. XXX. XXXSet the network broadcast address for this interface. XXX. XXX. XXX. XXXSet the IP network mask for this interface. Gateway not defined here for DHCP client. Loopback. (1. 27. C 1. 92. 1. 68. XXX. XXX, reserved class B. XXX. XXX and reserved class A 1. XXX. XXX. XXX. For historical reference the network classes are defined as follows. Class A: Defined by the first 8 bits with a range of 0 - 1. XXX. XXX. XXX. One class A network can define 1. XXX. XXX. One class B network can define 6. XXX. One class B network can define 2. Ip. Tables firewall rules can be used. IP masquerading (NAT) can be used to connect private local. LAN) to the internet or load balance servers. One can add firewall rules by using iptables (or ipchains). This example uses 2. Fedora Core 3: /lib/modules/2. The configuration will be stored so that it will be utilized. In this case the device must be defined. Use the Red Hat GUI tool /usr/bin/netcfg. ORDefine network parameters in configuration files. Define new device in file (Red Hat/Fedora) /etc/sysconfig/network- scripts/ifcfg- eth. S. u. s. e 9. 2: /etc/sysconfig/network/ifcfg- eth- id- XX: XX: XX: XX: XX). BOOTPROTO=static. IPADDR=1. 92. 1. 68. NETMASK=2. 55. 2. GATEWAY=XXX. XXX. XXX. XXX. HOSTNAME=node- name. DOMAIN=name- of- domain. Special routing information may be specified, if necessary, in the. Red Hat/Fedora): /etc/sysconfig/static- routes(S. XXX. XXX. XXX. 0 netmask 2. XXX. XXX. XXX. XXXORDefine network parameters using Unix command line interface. Define IP address. XXX. XXX. XXX. XXX netmask 2. XXX. XXX. XXX. 2. If necessary, define route with with the. XXX. XXX. XXX. XXX dev eth. XXX. XXX. XXX. 0 netmask 2. XXX. XXX. XXX. XXX dev eth. Where XXX. XXX. XXX. XXX is the gateway to the internet as defined. ISP or network operator. The destination host must be reached through one or more IP gateways. The first gateway is the only one which is known by the host system. First the packet is examined to see if its'. If it is to be sent to a. See command: /etc/sysconfig/network- scripts/ifup- routes eth. Dynamic routes: RIP (Routing Information Protocol) is used to define dynamic routes. Do not resolve host names for faster results.- e. Print more extensive information about routes.- v. Verbose.- -help. Route command information. If not specified then print route table information.- host XXX. XXX. XXX. XXXAdd a single computer host identified by the IP address.- net XXX. XXX. XXX. XXXAdd a network identified by the network address, to the route. XXX. XXX. XXX. XXXSpecify the network gateway. XXX. XXX. XXX. XXXSpecify the network netmask. Of all the routes specified, identify one as the default network route. Two routers/gateways. Add internet gateway as before: route add default gw 2. Add second private network: route add - net 1. Show which processes are using a particular file/directory: fuser file- name. This command will list the process ID and a descriptor indicating the following. Durrent directory. Executable. f: a file open for reading. F: a file open for writing. Roo directory. m: Memory Mapped File/Directory. List processes using a specified TCP/UDP socket: fuser - v - n tcp 8. Kill a process using a specified TCP/UDP socket: fuser - i - k 8. Any signal can be sent to the process, not just . Older packages such as routed and gated are no longer supported. Don't resolve host names- g: Show multi- cast group membership info- c: Continuous mode - update info every second- v: Verbose- e: Extended information- o: show network timer information. List all connected processes: netstat - nap. List all processes with a TCP connection: netstat - tlnp. This will list open TCP ports. TCP. - l: listening ports only. ID. one can also use the command: lsof - i - PShow network statistics: netstat - s. Display routing table info: netstat - rn$ netstat - nr. Kernel IP routing table. Destination Gateway Genmask Flags MSS Window irtt Iface. U 0 0 0 eth. U 0 0 0 eth. UG 0 0 0 eth. Flags. G: route uses gateway. U: Interface is . Use Cntl- C to stop ping. One can install traceroute: apt- get install traceroute). IP- address- of- servertraceroute domain- name- of- servermtr. Fedora - Like traceroute. Leave. running to get real time stats. Reports best and worst round trip times. Unlike nslookup, the host command will use both /etc/hosts as well as DNS. Also see. Testing your DNS (Yo. Linux Tutorial) Note that nslookup does not use the /etc/hosts file. The listener handles the. Matches the name given in the file /etc/servicessocket- type. TCP). dgram: datagram protocols (UDP). Transport protocol name which matches a name in the file /etc/protocols. Often. nobody, root or a special restricted id for that service. This includes argument 0 (argv. The best source of information is the man page and its many examples. I have no explanation as to why this occurs or how to fix it other. Instead of telnet, rsh or rlogin, one should use the encrypted connection ssh. If you wish to use rwhod. Allow broadcast capabilities. Edit /etc/init. d/rwhodchange from: daemon rwhodto: daemon rwhod - b. Set service to start with system boot: chkconfig - -level 3. Start rwhod service: service rwhod start(or: service rwhod restart). Man pages: rwho: who is logged in on local network machines. RPC: Remote Procedure Calls with rpcbind (current) / portmapper (older RHEL5- ). Rpcbind or portmapper are required to manage RPC (Remote Procedure Call) requests from services like NFS (file sharing services), NIS (Network Information Services) and SAMBA. This is logged to /var/log/secure. Advanced PAM: More specific access can be assigned and controlled by. Rules and modules are stacked to. Can track and force password changes. This is often done to avoid exceeding the bandwidth when sending traffic to a particular device such as a wireless modem during peak network bursts. The rest of the man pages describe specific uses of the command. Tcng takes input from a script to be parsed and actions delegated to lower level components and to eventual kernel module directives. See discussion below. Lowest used by default. Report IP addresses.- t. Don't print a timestamp on each dump line. Filter expressions. Descriptionhost host- name. If host has multiple IP's, all will be checked. Network number. net network- numbermaskmask. Network number and netmask specified. Port number specified. Sniff TCP packets. Sniff UDP packets. Sniff icmp packets. Examine data from a live network. This is a. great network discovery program with cool graphics. Good for monitoring your workstation. Cheops can identify all. IP address, their DNS. Cheops can run a port scan. Export to Cisco Netflow for network analysis reporting. Identifies malicious or unauthorized access attempts. The MAC addresses are remembered (ARP cache) for future network communications. Typically all you will see in the arp table is your router or gateway. No Linux system configuration is necessary. Replies of acknowledgement are sent to each end of the connection to communicate the fact that the transmitted data was valid to determine if the data should be re- sent. Include file linux/in. Set these values by using the SETSOCKOPT API. IP. Many. routers do not support forwarding of multicast packets or have a. Linux kernel supports up to four. COM1 COM2 COM3 COM4. Serial Ports (RS- 2. S0 /dev/tty. S1 /dev/tty. S2 /dev/tty. S3. Serial devices (dial in)(virtual terminal consoles)/dev/cua. Serial devices (dial out)4 4 4 4. Interface major numbers (dial in)5 5 5 5. Interface major numbers (dial out)6. Interface minor numbers. The command ls - l /dev/tty. S* /dev/cua* will show the device major and minor numbers. This uses 3. 2 bits to. IP address. up to 2. Which is the representation of four 8 bit. The. protocol has also been upgraded. Currently. Linux supports IPv. IPv. 4 is used when connecting your computer to. The protocol. defines the data packets transmitted. Each time a TCP/IP packet passes through a router it will. TTL count. When the count reaches zero the packet is. This ensures that errant routing and looping. This info is not routable. The ARP table maps TCP/IP. The MAC address uniquely identifies each node of a. Ethernet protocol. The devices will all be on the same network and/or subnet. Identifying network ..
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