Archive for May, 2015

CDP stands for Cisco Discovery Protocol Designed by Cisco Company to help the network administartors.Using CDP admins used to collect information about both locally attached devices and remote devices.Today here in this this article we learn how to turn on or turn off cdp advertisement on routers as well as see the information of directly and indirectly connected devices.We will also learn how to see ios version of neighbor routers and directly connected routers.CDP also helps us to see the status of router interface or switch ports.To understand CDP i have designed a topology diagram in cisco packet tracer.As you can see below i have taken 5 router R1 R2 R3 R4 and R5 in below topology diagram. (more…)

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In our previous article we already have seen how to configure Cisco Router as a DHCP Server,But today in this article we will learn how to configure a Cisco Router as a DHCP Client.When we configure a Router as a DHCP Client then the Router will be able to obtain it’s interface ip address automatically from DHCP Server.

router as a dhcp client

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Here today in this tutorial we will learn how to setup and configure VLAN on cisco switches.We will learn how to create VLANs and Ports.We will also learn how to Remove VLANs and ports. Troubleshooting tips related to VLANs.How to assign vlan membership and we also learn how to convert connection link to trunk.But before configuring VLAN,I will love to inform you that you don’t need to configure VLAN untill or unless your network get so large and have so much traffic.I have seen so many people configuring and using VLAN only because the network they are working on was already using them.

Note:by default all the devices coonected with a switch are in VLAN 1.

So you dont need to do anything to use switch for your connectivity, you just have to connect your devices with switch ports and you are in network.

A VLAN is a broadcast domain formed by switches.

VLAN’s provide better performance for medium and large LAN’s.

A trunk port is a special port that runs ISL or 802.1q so that it can carry traffic from more than one VLAN. (more…)

If you are a network engineer or preparing for a network admin or networking related exam like CCNA,you must know how to control the traffic in and out of a cisco router using an access list(ACL).Once you understand the basic concept of ACL then it is very easy to configure it.Today here in this article we will learn basic concept of ACL and will also learn how to configure ACL on Cisco Router to control the traffic in a network.so if you want to understand ACL in few simple words then you can say that it is a network security protocol which denies or permits traffic between networks. Using ACL we can block or we can  allow certain end users(pc,laptop,printers etc) accessing some network resources . Today we will go through ACL configuration with an example using Packet Tracer.To understand ACL working,concept and its configuration i have taken an example in which i have taken 1 router and 6 pc.You can see the network topology diagram below. (more…)

Dmidecode utility is used to find or view Bios and hardware  information about our machine.This article will be very helpful in troubleshooting through your linux machine.It will help you to know the exact information about the device and drivers required for your motherboard.If you want to know exact model of your computer which includes motherboard,processor,hard drive,dvd writter,usb slot,graphics card,network card,bios,manufacturer etc you can easily get all those information using this command.

 

How to see the Model of Your Computer?

 

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[root@satish ~]# dmidecode |grep Product
        Product Name: PI945GCM
        Product Name: PI945GCM

 

If you use only dmidecode command without any other option it will show you the Complete Information it have.

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[root@satish ~]# dmidecode
# dmidecode 2.9
SMBIOS 2.5 present.
27 structures occupying 1305 bytes.
Table at 0x000FD620.
Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
        Vendor: American Megatrends Inc.
        Version: 080012
        Release Date: 08/16/2007
        Address: 0xF0000
        Runtime Size: 64 kB
        ROM Size: 512 kB
        Characteristics:
                ISA is supported
                PCI is supported
                PNP is supported
                APM is supported
                BIOS is upgradeable
                BIOS shadowing is allowed
                ESCD support is available
                Boot from CD is supported
                Selectable boot is supported
                BIOS ROM is socketed
                EDD is supported
                5.25"/1.2 MB floppy services are supported (int 13h)
                3.5"/720 KB floppy services are supported (int 13h)
                3.5"/2.88 MB floppy services are supported (int 13h)
                Print screen service is supported (int 5h)
                8042 keyboard services are supported (int 9h)
                Serial services are supported (int 14h)
                Printer services are supported (int 17h)
                CGA/mono video services are supported (int 10h)
                ACPI is supported
                USB legacy is supported
                LS-120 boot is supported
                ATAPI Zip drive boot is supported
                BIOS boot specification is supported
                Targeted content distribution is supported
        BIOS Revision: 8.12

 

 

But if you want to see some specified things you need to put options for that with dmidecode command.

Examlple:

How to see the L1&L2 Caches Related Information present in Your PC.

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[root@satish ~]# dmidecode -t cache
# dmidecode 2.9
SMBIOS 2.5 present.</code></span>
Cache Information
        Socket Designation: L1-Cache
        Configuration: Enabled, Not Socketed, Level 1
        Operational Mode: Write Back
        Location: Internal
        Installed Size: 64 KB
        Maximum Size: 64 KB
        Supported SRAM Types:
                Other
        Installed SRAM Type: Other
        Speed: Unknown
        Error Correction Type: Parity
        System Type: Data
        Associativity: 8-way Set-associative
Handle 0x0006, DMI type 7, 19 bytes
Cache Information
        Socket Designation: L2-Cache
        Configuration: Enabled, Not Socketed, Level 2
        Operational Mode: Write Back
        Location: Internal
        Installed Size: 1024 KB
        Maximum Size: 1024 KB
        Supported SRAM Types:
                Other
        Installed SRAM Type: Other
        Speed: Unknown
        Error Correction Type: Single-bit ECC
        System Type: Instruction
        Associativity: 8-way Set-associative
Handle 0x0007, DMI type 7, 19 bytes
Cache Information
        Socket Designation: L3-Cache
        Configuration: Disabled, Not Socketed, Level 3
        Operational Mode: Unknown
        Location: Internal
        Installed Size: 0 KB
        Maximum Size: 0 KB
        Supported SRAM Types:
                Unknown
        Installed SRAM Type: Unknown
        Speed: Unknown
        Error Correction Type: Unknown
        System Type: Unknown
        Associativity: Unknown

 

How to see the manufacture name of your Processor?

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[root@satish ~]# dmidecode -s processor-manufacturer
Intel

How to get the information related to your BIOS?

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[root@satish ~]# dmidecode -t bios
# dmidecode 2.9
SMBIOS 2.5 present.
Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
        Vendor: American Megatrends Inc.
        Version: 080012
        Release Date: 08/16/2007
        Address: 0xF0000
        Runtime Size: 64 kB
        ROM Size: 512 kB
        Characteristics:
                ISA is supported
                PCI is supported
                PNP is supported
                APM is supported
                BIOS is upgradeable
                BIOS shadowing is allowed
                ESCD support is available
                Boot from CD is supported
                Selectable boot is supported
                BIOS ROM is socketed
                EDD is supported
                5.25"/1.2 MB floppy services are supported (int 13h)
                3.5"/720 KB floppy services are supported (int 13h)
                3.5"/2.88 MB floppy services are supported (int 13h)
                Print screen service is supported (int 5h)
                8042 keyboard services are supported (int 9h)
                Serial services are supported (int 14h)
                Printer services are supported (int 17h)
                CGA/mono video services are supported (int 10h)
                ACPI is supported
                USB legacy is supported
                LS-120 boot is supported
                ATAPI Zip drive boot is supported
                BIOS boot specification is supported
                Targeted content distribution is supported
        BIOS Revision: 8.12
Handle 0x000D, DMI type 13, 22 bytes
BIOS Language Information
        Installable Languages: 1
                en|US|iso8859-1
        Currently Installed Language: en|US|iso8859-1

 

How to see the information about memory of your system?

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[root@satish ~]# dmidecode -t memory
# dmidecode 2.9
SMBIOS 2.5 present.
Handle 0x0008, DMI type 5, 24 bytes
Memory Controller Information
        Error Detecting Method: 64-bit ECC
        Error Correcting Capabilities:
                None
        Supported Interleave: One-way Interleave
        Current Interleave: One-way Interleave
        Maximum Memory Module Size: 4096 MB
        Maximum Total Memory Size: 16384 MB
        Supported Speeds:
                Other
        Supported Memory Types:
                DIMM
                SDRAM
        Memory Module Voltage: 3.3 V
        Associated Memory Slots: 4
                0x0009
                0x000A
                0x000B
                0x000C
        Enabled Error Correcting Capabilities:
                None
Handle 0x0009, DMI type 6, 12 bytes
Memory Module Information
        Socket Designation: DIMM0
        Bank Connections: 0 1
        Current Speed: Unknown
        Type: DIMM SDRAM
        Installed Size: 1024 MB (Double-bank Connection)
        Enabled Size: 1024 MB (Double-bank Connection)
        Error Status: OK
Handle 0x000A, DMI type 6, 12 bytes
Memory Module Information
        Socket Designation: DIMM1
        Bank Connections: 2 3
        Current Speed: Unknown
        Type: DIMM SDRAM
        Installed Size: Not Installed
        Enabled Size: Not Installed
        Error Status: OK
Handle 0x000B, DMI type 6, 12 bytes
Memory Module Information
        Socket Designation: DIMM2
        Bank Connections: 4 5
        Current Speed: Unknown
        Type: DIMM SDRAM
        Installed Size: Not Installed
        Enabled Size: Not Installed
        Error Status: OK
Handle 0x000C, DMI type 6, 12 bytes
Memory Module Information
        Socket Designation: DIMM3
        Bank Connections: 6 7
        Current Speed: Unknown
        Type: DIMM SDRAM
        Installed Size: Not Installed
        Enabled Size: Not Installed
        Error Status: OK
Handle 0x000F, DMI type 16, 15 bytes
Physical Memory Array
        Location: System Board Or Motherboard
        Use: System Memory
        Error Correction Type: None
        Maximum Capacity: 4 GB
        Error Information Handle: Not Provided
        Number Of Devices: 4
Handle 0x0011, DMI type 17, 27 bytes
Memory Device
        Array Handle: 0x000F
        Error Information Handle: Not Provided
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 1024 MB
        Form Factor: DIMM
        Set: None
        Locator: DIMM0
        Bank Locator: BANK0
        Type: SDRAM
        Type Detail: Synchronous
        Speed: Unknown
        Manufacturer: Manufacturer0
        Serial Number: SerNum0
        Asset Tag: AssetTagNum0
        Part Number: PartNum0
Handle 0x0013, DMI type 17, 27 bytes
Memory Device
        Array Handle: 0x000F
        Error Information Handle: Not Provided
        Total Width: Unknown
        Data Width: Unknown
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: DIMM1
        Bank Locator: BANK1
        Type: Unknown
        Type Detail: Unknown
        Speed: Unknown
        Manufacturer: Manufacturer1
        Serial Number: SerNum1
        Asset Tag: AssetTagNum1
        Part Number: PartNum1
Handle 0x0015, DMI type 17, 27 bytes
Memory Device
        Array Handle: 0x000F
        Error Information Handle: Not Provided
        Total Width: Unknown
        Data Width: Unknown
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: DIMM2
        Bank Locator: BANK2
        Type: Unknown
        Type Detail: Unknown
        Speed: Unknown
        Manufacturer: Manufacturer2
        Serial Number: SerNum2
        Asset Tag: AssetTagNum2
        Part Number: PartNum2
Handle 0x0017, DMI type 17, 27 bytes
Memory Device
        Array Handle: 0x000F
        Error Information Handle: Not Provided
        Total Width: Unknown
        Data Width: Unknown
        Size: No Module Installed
        Form Factor: DIMM
        Set: None
        Locator: DIMM3
        Bank Locator: BANK3
        Type: Unknown
        Type Detail: Unknown
        Speed: Unknown
        Manufacturer: Manufacturer3
        Serial Number: SerNum3
        Asset Tag: AssetTagNum3
        Part Number: PartNum3

How to see the information related to your system?

 

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[root@satish ~]# dmidecode -t system
# dmidecode 2.9
SMBIOS 2.5 present.
Handle 0x0001, DMI type 1, 27 bytes
System Information
        Manufacturer: Kobian
        Product Name: PI945GCM
        Version: 1.X
        Serial Number: 1131
        UUID: 00020003-0004-0005-0006-000700080009
        Wake-up Type: Power Switch
        SKU Number: To Be Filled By O.E.M.
        Family: To Be Filled By O.E.M.
Handle 0x000E, DMI type 15, 35 bytes
System Event Log
        Area Length: 4 bytes
        Header Start Offset: 0x0000
        Header Length: 2 bytes
        Data Start Offset: 0x0002
        Access Method: Indexed I/O, one 16-bit index port, one 8-bit data port
        Access Address: Index 0x046A, Data 0x046C
        Status: Invalid, Not Full
        Change Token: 0x00000000
        Header Format: No Header
        Supported Log Type Descriptors: 6
        Descriptor 1: End of log
        Data Format 1: OEM-specific
        Descriptor 2: End of log
        Data Format 2: OEM-specific
        Descriptor 3: End of log
        Data Format 3: OEM-specific
        Descriptor 4: End of log
        Data Format 4: OEM-specific
        Descriptor 5: End of log
        Data Format 5: OEM-specific
        Descriptor 6: End of log
        Data Format 6: OEM-specific
Handle 0x0019, DMI type 32, 20 bytes
System Boot Information
        Status: No errors detected

How to see the information related to your system slot?

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[root@satish ~]# dmidecode -t slot
# dmidecode 2.9
SMBIOS 2.5 present.

Use -s Option to know some options

 

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[root@satish ~]# dmidecode -s
dmidecode: option requires an argument -- s
String keyword expected
Valid string keywords are:
  bios-vendor
  bios-version
  bios-release-date
  system-manufacturer
  system-product-name
  system-version
  system-serial-number
  system-uuid
  baseboard-manufacturer
  baseboard-product-name
  baseboard-version
  baseboard-serial-number
  baseboard-asset-tag
  chassis-manufacturer
  chassis-type
  chassis-version
  chassis-serial-number
  chassis-asset-tag
  processor-family
  processor-manufacturer
  processor-version
  processor-frequency

 

How to see your processor Frequency?

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[root@satish ~]# dmidecode -s processor-frequency
1600 MHz

 

How to know your system-uuid?

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[root@satish ~]# dmidecode -s system-uuid
00020003-0004-0005-0006-000700080009

How to know Your System Product Name?

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[root@satish ~]# dmidecode -s system-product-name
PI945GCM

How to know your BIOS VENDOR?

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[root@satish ~]# dmidecode -s bios-vendor
American Megatrends Inc.

How to know your system serial number?

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[root@satish ~]# dmidecode -s system-serial-number
1131

 

How to know chassis serial number?

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[root@satish ~]# dmidecode -s chassis-serial-number
To Be Filled By O.E.M.

 

How to see your Processor version?

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[root@satish ~]# dmidecode -s  processor-version
Intel(R) Pentium(R) Dual  CPU  E2140  @ 1.60GHz

 

(more…)

If you are a java programmer and you want to write or run  your java program on linux platform this article is for you.this article will help every java programmers who want to understand how to write and execute java programs on linux os.My motive behind this article is just to show you how to write,compile and run a java program in linux machine and for that i am using a simple java program.Here in this article i have just used a simple java program examples to show you how you write,save,compile and run this java program in Red hat Enterprise Linux. (more…)