Questions tagged [design]

For questions about planning and implementation of a computer network. Use this tag when you have questions about how to design your network and what things to take into account when implementing a new network infrastructure.

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Issues expanding subnet from /24 to /21

I've read the posts already here about increasing a subnet and the various possible issues including broadcast traffic. But those examples seem to be a drastic change from a /24 to a /16. What about ...
Desert IT Guy's user avatar
1 vote
1 answer
115 views

For IPv6, How much processing delay difference between using /64 and /127 for Core network interconnection?

I've question about IPv6 routing processing delay. Lets assume we've got big Core network with huge traffic and many hops. All router's p2p interconnection addresses are used /127 network. In my ...
Ulteara's user avatar
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2 answers
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Server with multiple NICs takes different route when answering

I have multiple servers which share 2 networks. That is the LAN Network at 192.168.1.0/24, aswell as the Backbone Network at 192.168.5.0/24. ┌────────────────┐ ...
Gandalf1783's user avatar
0 votes
1 answer
139 views

Is a port channel necessary between redundant core switches?

A course I am following mentions some examples and basics of network design, which includes the 2-tier/3-tier campus LAN designs. About the 3-tier design Would a port channel be necessary between C1 ...
Mitrixsen's user avatar
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1 vote
3 answers
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Are routers necessary in a 2-tier LAN design?

I am learning about various network topologies/design and I often see the following topology as an example for a 2-tier design. Why are the layer 3 switches at the distribution layer connected to ...
Mitrixsen's user avatar
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10 votes
5 answers
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Why are rings not a favorite option in IT networks?

I'm an engineer in the automation field. I've been switching slowly to networking. I've started in the automation world 12 years ago. With an automation mindset, we use rings (like MRP rings) ...
AhmedWas's user avatar
  • 263
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2 answers
76 views

Office is 420m away from the landline relay box, need help figuring out a solution

We are an agricultural technology startup, we develop and provide advanced solutions like hydroponics etc. We are based in Egypt, Africa; where the most you can wish for is FTTC, regardless, the ...
Yahia El-Masry's user avatar
1 vote
4 answers
2k views

Can a router provide DHCP to multiple subnets that are connected via switches?

I'm trying to understand if it is possible to have a router (as shown in the below diagram) provide DHCP leases to more than one subnet if the subnets are not directly attached. If both the printers ...
NULLZ's user avatar
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2 votes
0 answers
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Designing Workaround for Missing IPv6 Support (OSPF or BGP)

We have a pair of Ruckus (Brocade) ICX 7750s that we use as our core routers. They currently handle a BGP connection with our ISP and then use OSPF for internal routes. Our ISP is finally going to ...
yakatz's user avatar
  • 181
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3 answers
1k views

Using 40 MHz wide channels in a 2.4 GHz wireless network deployment

We have a site (a secondary school) where all WiFi networks are managed by us. The building should in theory have no rogue APs that introduce interference, however, other RF emitters such as ...
user166213's user avatar
1 vote
0 answers
24 views

how does heterogeneous servers fit in Clos topology? [closed]

I wonder whether heterogeneous servers can fit together in Clos / spine-leaf topology? And how the design should look like in this case? We have 600 10G stand-alone servers and want multiple 40G ...
Mohamed Galal's user avatar
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2 answers
174 views

Plant Network Setup

I am looking to setup a plant network as part of a job I am currently working on and I wanted to get some advice on how I am planning on doing it as well as some information at a point where I need a ...
Leo_Da_Vinc's user avatar
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1 answer
70 views

Routing switches at core and distribution

My employer has your standard 3 layer architecture, however they want both core and distribution routing and switching. This is so that some networks are routed, and some use only layer 2 between ...
user3524785's user avatar
1 vote
2 answers
597 views

Transfer subnet needed between Firewall and Routing Switch?

When looking at the image, the Switch is routing capable (L3) and is the default gateway for clients in the LAN. We plan to introduce a new Firewall and stand before the question if we should give its ...
DavidTrevor's user avatar
3 votes
2 answers
359 views

SFP to SFP going through multiple environments – segmented or via single cable?

Design consideration – should I use a single fiber between two server rooms or split it into segments for easier maintenance/diagnostics/replacement? But splitting the fiber into multiple segments ...
miroxlav's user avatar
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5 votes
2 answers
305 views

Standards for network design / installation diagramming in CAD

Ok, So I know this is a strange question and might be off-topic, but I really do not know where is the best place to ask it ( and where better that a SE site of network engineers / designers ). TL;DR ...
Obmerk Kronen's user avatar
1 vote
1 answer
95 views

What are the differences between injecting the default route to IGP using a static route or using a generated route?

Let's say, that I have a following network topology: isp_router[t1-0/0/0.0] <-> [t1-0/0/0.0]ospf_asbr I want to generate a default route for IGP in ospf_asbr router. One option would be a ...
Martin's user avatar
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1 vote
2 answers
1k views

Routers and layer 3 switches for connecting two buildings on site using fiber

I understand layer 3 switches are essentially routers, but often don't have the capabilities a router has, e.g. NAT. So I'm trying to work out where it would be necessary to have layer 3 switches vs ...
The_Bear's user avatar
  • 515
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2 answers
176 views

Trying to setup 5Gbps setup with APC and AP

I currently have a 5Gbps line being provided and want to set up an Access Point Controller (WEC-8050) with Access Points (WEA512i) and Cisco Catalyst 2960-x 48 port, is this possible? The APC and ...
Simon Kang's user avatar
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2 answers
1k views

SFP/SFP+: Extender? F/F panel passthrough?

My primary question is this: Is it possible to have a simple passive SFP/SFP+ bulkhead passthrough connector, with two female SFP/SFP+ sockets facing opposite directions and wired directly together, ...
Dale Mahalko's user avatar
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2 answers
57 views

'Flat' FlexVPN Network Design with multi gateways [duplicate]

The use case is a meshed ip radio network where the radio's move around alot. Multiple gateway's (FlexVPN Spokes) are statically located to re-bridge the meshed radio network when the radio's travel ...
user62139's user avatar
9 votes
5 answers
14k views

Cascading Switches. Will it affect performance?

I am really new to large scale networking and all I know is the basics. I will be doing a network for a huge workspace consisting of multiple offices. There will be a total of 308 Clients, with at ...
Aaron Alfonso's user avatar
3 votes
4 answers
756 views

Carving out a /28 network and still maintaining access to parent /24 network

In the diagram below, I'd like to carve out a /28 network from 192.168.0.0/24 and move it to another geographical location and still maintain access in and out of the original /24 network. ...
Cragmuer's user avatar
1 vote
1 answer
53 views

Help with network setup [closed]

I have the following situation: Router 2 is a given. It is used by several people to go on the internet ('People we don't trust'). We are a tiny company that is supposed to go on the internet ...
Kristof's user avatar
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1 answer
182 views

How to change ip TTL=1 on flat network for security [closed]

Working on a network at an high rise apartment complex. They have a core router/firewall acting as dhcp server and about 7 switches (all l3 switches). They have a few vlans to segment traffic based of ...
ITWeasel's user avatar
4 votes
2 answers
3k views

why do we use a layer 2 switch in a DMZ rather than a layer 3?

I've been trying to learn about DMZs. It's hard to find a technical explanation that does not dive head long into the complexities of Cisco hardware, which I'm finding confusing as I'm new to ...
Jay Black's user avatar
2 votes
4 answers
2k views

What happens if I connect several switches together in a loop?

Suppose I want to network a stadium and I have 20 switches connected in a loop. My goal is to be able to connect a laptop to any of the switches and connect to the network and limit my TTL going ...
SweetPoontang's user avatar
1 vote
1 answer
187 views

What is difference between "topology of network" and "geometry of network"?

In the Internet some times, we hear of the term "geometry of the network": https://bit.ly/2VqI2YO Is there any difference between the term of "geometry of the network" and "topology of the network"? ...
Questioner's user avatar
3 votes
1 answer
620 views

Is this a valid OSPF topology?

In the following topology: every Backbone router is an ABR. Router 2 belongs to three different areas, area 0, area 1, and area 4. is this a valid topology for OSPF ? it works as expected and it ...
Forrest's user avatar
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0 votes
1 answer
41 views

config of cisco 2950 switches [closed]

i have a cisco sw 48 port and 2 are gb ports. i have 4 servers and most of the ports are directly connected to the users i.e access port and some are going to the tp link switches and some are going ...
Tahree khan's user avatar
0 votes
2 answers
1k views

Creating a network for three separate businesses in one building

What would be best practice in terms of creating a network to satisfy three separate businesses located in one building? The building in question has three floors, each floor has 25 workstations and ...
m1ddleware's user avatar
2 votes
1 answer
2k views

Configuring multiple subnets with switch connected to single router interface

I have a design like this But I'm receiving a lot of mismatch errors and it doesn't work at all. I tried to ping 10.0.0.1 to no avail. I'm trying to configure the vlans on the switch 1 this way (...
Cliff's user avatar
  • 53
6 votes
2 answers
1k views

Internet structure and ISP networks in detail

I am studying about internet structure, ISPs and their interconnection. However, I have trouble connecting some terms and understanding the greater infrastructure of internet in more detail. I will ...
konstantinosAR's user avatar
1 vote
0 answers
64 views

How to design network with high availability in a multilevel small workplace [closed]

I want to create a network in my work 4 floors 50m2*4 workplace. Requirements are simple: Share internet ( < 20mb/s ADSL) while blocking someone from abusing download speed for long period. (...
Zalaboza's user avatar
  • 111
0 votes
1 answer
249 views

Trade Floor Network Design Feedback [closed]

I have an assignment that I am working on. Now I admit, I am far from knowledgeable and I have nowhere to turn to for help at the moment. I am not asking for someone to complete the assignment for me, ...
Hex Omega's user avatar
0 votes
1 answer
734 views

Is forwarding rate important for selecting a collapse core switch in IP camera implementation?

I need to select a core switch that will connect my access switch to an IP surveillance's server. The point is that in my network I'll have 109 IP camera sending real time traffic to the server and I'...
Enmanuel Medina's user avatar
3 votes
1 answer
384 views

OSPF Area Design

Have a hub and spoke design where each Branch has a single router with a WAN connection to DataCenter1 Hub and another WAN connection to DataCenter2 Hub. There is no OSPF running elsewhere in the ...
mr2018's user avatar
  • 31
4 votes
1 answer
1k views

Should a Metropolitan Area Network (MAN) be setup with a router at each site?

Should a Metropolitan Area Network (MAN) be setup with a router at each site? Or, because the connections between sites are usually at layer two, should each site operate on one "master" switch which ...
Jason's user avatar
  • 143
2 votes
2 answers
735 views

Re-tagging identically tagged VLANs

Given multiple networks all with the same VLAN tag, is VLAN re-tagging a wise thing to do in order to keep them separated on the same physical network? If so, how can I achieve this without getting ...
Brailyn's user avatar
  • 21
2 votes
1 answer
122 views

network infrastructure configuration design in a openstack environment to enable instances to have a public IP as floating IP

Has anyone had an idea of what are the possible configuration design of a network infrastructure in an OpenStack environment to enable instances to have a public IP as a floating IP? An example below ...
reynold's user avatar
  • 123
2 votes
2 answers
329 views

vlans - How to manage vlans in this scenario?

Note: This is not a project of an existing or future real network but only my laboratory in GNS3. Hey, I have a network project presented as in the diagram where: pfSense works as a firewall and ...
Vertisan's user avatar
  • 121
2 votes
1 answer
346 views

Proper network design for office use

I have two 4G LTE router modems in my office which we want our clients connect to these modems to have access to the internet. I have a shared server which should connect to these both modems that ...
Mohammad_Hosseini's user avatar
1 vote
1 answer
562 views

Network design question for datacenter

We have new customer and they said their traffic requirement is ~40GB so i am planning to order some hardware and have some question or doubt in mind. I am planning to put Nexus 5000 for Core layer ...
Satish's user avatar
  • 4,369
1 vote
1 answer
468 views

diff btw PTSN and DSL?

I have seen DSL compared to PTSN (public switched phone network). What are some of the major differences? Is there anything about this answer to a similar question [https://www.quora.com/What-is-...
Zach Valenta's user avatar
1 vote
1 answer
986 views

Hardware implementations of BFD

Is there any hardware implementation of BFD (Bidirectional Forwarding Detection)? In such case, what will be the average times for discovering a link failure instead of a path failure? Thanks
leo8a's user avatar
  • 13
3 votes
4 answers
3k views

L3 Core to Firewall question

I'm in need of some advice regarding the implementation of the network core layer of a network I need to design. I've found some similar questions asked (and answered) already, but none have really ...
logicallysynced's user avatar
0 votes
4 answers
3k views

Calculate max transfer speed in LAN network

We have a LAN network between consumers and producers servers. Producers' output path has been mounted in consumers. There is a 10 Gig switch between producers and consumers and the link between each ...
vakarami's user avatar
  • 103
6 votes
2 answers
12k views

Do i need to configure VLANS on my router/firewall or just the switch?

I finally took time to map my entire shitty network to understand exactly what the guy before me did, and i must admit i'm a little bit surprised even if i'm not a network expert... Just take a look ...
Thierry Dalleau's user avatar
3 votes
3 answers
2k views

Need some advice with network topology

Hi Network Engineer experts out there, I need to refresh our network infrastructure since our network is not secure and not very structured. Right now, our network doesn't have VLANs, everything is ...
Will's user avatar
  • 141
1 vote
2 answers
167 views

L2 network design questions

Good afternoon everyone. I would like to know the textbook answer to a network I've been asked to assist with. I have an IT cupboard which serves the location as the MDF. I then have a variety of ...
eto.ttnflt's user avatar