Networking Protocols

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Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.

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If I have two cores linked together, how can they share a single loopback address with the same address?

Core 1
inter lo0
ip add 1.1.1.1 255.255.255.255

int lo1
ip add 3.3.3.3 255.255.255.255…

124 views
Efficient way to get backups off site to Azure
Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Neighbor went down.  Router log shows that the core switch's dead timer expired.

I checked:

Hello and dead timers are the same. 10, 40
No mismatch in network commands, areas, mask, or MTU

222 views

Attached are config files for my test ospf network on packet tracer.   I'm trying to mimic an ASE switch  in the middle connecting all these router.  Can some please look at the switch and tell me …

628 views

I have seen in OSPF configuration examples where sometimes they use Network command to advertise networks and sometimes Redistribute connected subnets.

For instance
R1------R2------R3
R1 in area…

39 views

Good afternoon All

I have a routing / DR problem I would like help /advice on please.

I have 2 sites, A and B, the primary route from on to the other is via an MPLS.  I would like to introduce a…

341 views

I am looking at the config of my L3 switches and I see that they have the static route to null0:
ip route 169.254.0.0 255.255.0.0 Null0
ip route 172.16.0.0 255.255.0.0 Null0
ip route 192.168.0.0 …

724 views

I am just wondering what can cause a network loop even though stp is enabled?

1034 views

A macbook is upgraded from yosemite/captain to newly released Sierra(10.12) yesterday. In Sierra, the OpenVPN connects successfully but could not access our internal sites which was and is working …

1381 views

I am adding a new route-map MY-FILTER to my Cisco switch config. But I see that I already have another route-map MY-ROUTE-MAP. Both route-maps have the PERMIT 10 but they are calling different ACL. …

119 views

I have a connection between 2 sites and I am using 2 SVIs /30 to advertise my EIGRP routing. Everything works fine. Site A can see subnets from site B and vice versa. Now I have one subnet (configured…

138 views
VMware Disaster Recovery and Data Protection
VMware Disaster Recovery and Data Protection

In this expert guide, you’ll learn about the components of a Modern Data Center. You will use cases for the value-added capabilities of Veeam®, including combining backup and replication for VMware disaster recovery and using replication for data center migration.

I currently have the PBR below only on the SVIs at the core switch that forces the users on vlan20 10.10.20.0 to use FW2:
access-list 20 permit 10.10.20.0 0.0.0.255
!
route-map PBR20 permit 20
 …

125 views

Hello:

I am preparing to update a firewall that we have and it appears that there is a bug with the current version regarding the upgrade to the next version.  There is a work-around; but, that …

1261 views

I installed Cerebrus ftp server and using FileZilla and FTP Voyager as clients.
I can connect and browse the server over port 21 without any issue.

When using SSL/TLS connection over port 990 I …

527 views

In my network diagram below with all Cisco gears, I am trying to advertise 10.10.50.0 via EIGRP on ESW3 but it does not seem to work. 10.10.50.0 is not defined as a SVI on ESW3. It is a lopback IP …

631 views

I have a couple of static routes and a default route. Is it possible to redistribute just the static routes and not the default route (ip route 0.0.0.0 0.0.0.0 next_hop). Thanks

536 views


Hi,

 I have set up two new Linux (CentOS 7) servers on the network. They received dynamic IP addresses (192.168.1.144  & 148 respectively) from Windows DHCP server. The computer names are …

4066 views

My virtual server resides on site A and the ~ 500 devices reside in site B. Currently, they are connected via a trunk but soon, the trunk will be migrating to a layer 3 with point-to-point VLAN /30 IP…

31145 views

My question is based on the attached net diagram. I have layer 3 at my uplinks in the ring, except sw1 and sw2. This is where I am wondering if I should leave it a layer 2 between those 2 switches …

1087 views

Suppose you had a virtual server setup www.foo.com 10.10.200.21 reachable via SSL/443.

It has two resources serverA.foo.com and serverB.foo.com selected by
round robin selection and reached at …

345 views
PRTG Network Monitor: Intuitive Network Monitoring
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

That is - is the return path differing from the send path? And under what circumstances is this a problem?

527 views

Does anyone know how to configure a  Cisco Auto Smartport for Dell laptops? Not sure if the Dell and HP laptops support CDP but I am guessing that we need to configure using the last-resort trigger.  …

272 views

I am trying to setup SSH and it does not seem to work. I am using secureCRT and it timedout. What am I missing? Below are the commands that I used in my config:

hostname sw1
ip domain-name …

1166 views

I am trying to use policy routing to send some of my users to fw2 from sw2. sw1 has a default route pointed to fw1. sw1 redistibutes that default route to EIGRP. sw2 learns his default route via …

1867 views

BGP Network restrictions

I have read online that "Most transit provider will refuse to announce a BGP prefix smaller than /24"

I wonder if they mean Internal Network or th eexternal Network ?

635 views

People,

Can anyone here please assist me in what tool can I do to scan which IP address is the web management console or SSH port for the managed switch ?

I have to audit each IP address subnet …

13132 views
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