By default, Junos OS checks for SYN flags in the first packet of a session and rejects any TCP segments with non-SYN flags attempting to initiate a session. You can leave this packet flow as is or change it so that Junos OS does not enforce SYN flag checking before creating a session. Figure 1 illustrates […]
Let’s see the comparison routing protocol (EIGRP, OSPF and BGP) Property EIGRP OSPF BGP Administrative Distances Internal – 90 External 170 110 EBGP – 20 IBGP – 200 Method Advanced distance vector Link state Path vector Summarization Auto and manual Manual Auto and Manual VLSM Yes Yes Yes Convergence Speed Very fast convergence Fast Slow Timers: […]
When we face a problem like a call failed or no audio in SIP, usually we need to get the PCAP dump file and check the packets. This article is about how to use Wireshark to analyze SIP calls. 1.Filter Expression of Wireshark PCAP dump file contains all the protocols travel the network card, Wireshark […]
Deployment Steps: Step 1: Configuring a VPN policy on Site A SonicWall. Step 2: Configuring a VPN policy on Site B Cisco ASA Firewall Step 3: How to test this scenario. Procedure: To manually configure a VPN Policy using IKE with Preshared Secret, follow the steps below: The below screen shot of SonicWall with basic […]
GNS3 Launches Version 2.0 Version 2.0 is a new major release of GNS3, which brings significant architectural changes and new features to the growing community of over 900,000 registered network professionals. Since inception of the project GNS3 has made over 79 releases and been downloaded over 13,693,000 times. GNS3 started as only a desktop application […]
SOURCE: https://community.gns3.com/community/support/forum/blog/2014/12/26/alcatel-lucent-7750-sr-12-simulator-on-gns3 http://www.ciscoz.com/alcatel-lucent-in-gns3/ 1. Download TIMOS-SR-12.0.R6-vm.zip from https://drive.google.com/uc?export=download&id=0B2pCmTulYG-dVTFsakpfZDFMZE0 2. Extract TIMOS-SR-12.0.R6-vm.zip and put sros-vm.qcow2 into C:\Users\user1\GNS3\Images 3. open GNS3 1.2.1 -click menu Edit/Preferences click QEMU/QEMU VMs click New Name: Alcatel Type: Default click Next Qemu binary: C:\Program Files\GNS3\qemu-2.1.0\qemu-system-x86_64w.exe RAM: 1920 MB click Next Disk image (hda): C:/Users/user1/GNS3/Images/sros-vm.qcow2 click Finish click QEMU/QEMU VMs click […]
First you must install sudo apt-get install vlan load kernel module sudo modprobe 8021q Create a new interface that is a member of a specific VLAN, VLAN id 100 We use the physical interface eth0 in this example. This command will add an additional interface next to the interfaces which have been configured already sudo […]
We will be looking into a very well known tool in Linux system administrators tool box. Some times during troubleshooting this tool proves to be very helpful. With the help of this tool you can analyze the packet before it reaches the application stack. And some times detect why the server is not responding to […]
While using VMWare workstation as a platform in running vIOS/IOSv (Cisco Virtual IOS) we usually use the pipe method to access the Virtual Serial console with the devices but using undocumented feature we could access it with any telnet capable terminal software. We only need to edit the VMware vmx file (ref: vnetlabs.com/….) and add […]
Cisco IOS on Unix, also known as Cisco IOU, is released for internal Cisco use only. IOU permits to run IOS natively on x86 platform while GNS3 must emulate the whole hardware. The big difference is that IOU can run more IOS instance than GNS3, but GNS3 can run real IOS version. The purpose of […]