Newest 'switch+subnet' Questions - Network Engineering Stack Exchange

-1 votes

1 answer

27 views

VLSM Error on Cisco Distribution Switch [duplicate]

I have created 3 VLANS which should not overlap but somehow are giving me overlapping problems. Any reasons why? Is the switch buggy? VLAN 10 10.1.1.0/28 255.255.255.240 Usable:10.1.1.0 to 10.1.1.15 ...

Xavier Lim

1

asked Mar 5 at 17:18

0 votes

1 answer

144 views

Switch ping to router with trunk port

If I have a switch port trunk directly connect to a router with the follow scenario below: -------- g1/0/1 (Trunk) g1/0/1 |------| |switch| Native VLAN 1 SVI=...

Andrew

103

asked Nov 9, 2023 at 15:12

0 votes

1 answer

713 views

Access multiple networks via one managed switch

We have a kind of granulated network structure. At the moment I have two network adapter connected to my system for two of the network areas. The Systems in network A and network B should not ...

MaKaNu

101

asked May 5, 2023 at 12:00

0 votes

1 answer

245 views

Make printer in different subnet accessible to other subnet

i am creating a network and i want the printer which is in a different subnet to be accessible by all other subnets. The router network is 192.168.10.0/24 further subdivided into /28 subnets. The ...

digiadit

1

asked Jan 20, 2023 at 14:31

6 votes

5 answers

5k views

Dividing a network into subnets using a router

I am learning about how L3 and IPv4 addressing works and I need some clarity on certain things. I've encountered the following topology So in this topology, the router stands in the center and ...

Mitrixsen

877

asked Feb 20, 2022 at 18:22

1 vote

2 answers

265 views

Can a host from different subnet bypass the network mask validation of destination host and communicate on layer 2?

I am aware that a host will always check the subnet of the destination node before the transmission in order known if it has to send it to the gatewey for different subnet. However, would it be ...

Floji

329

asked May 20, 2020 at 8:10

6 votes

2 answers

3k views

Can a single subnet work across several switches?

New to networking and studying hard but limited access to a kit to try things at the moment... My question is - if I had, for example, two Layer-2 switches cable connected, could I have devices on ...

ICSOTSecurityEngineer

63

asked Jan 19, 2020 at 17:32

0 votes

3 answers

518 views

Bridges, hubs, switches and repeaters in subnetting

I'm learning to subnet and I'm constantly doing exercises on paper about this topic. I'm trying to breakdown a network into smaller subnets, given the number of hosts for each one. For now, I only ...

aculf

3

asked Sep 3, 2019 at 17:15

4 votes

1 answer

1k views

Same Vlan Name / ID on different switches network subnet same or different?

I have several switches (some on same floor and another on other floors) all connected to core layer 3 switches through trunk links. One of the vlan id / name is repeated along the switches. May I ...

Novice Programmer

85

asked May 22, 2019 at 0:50

27 votes

9 answers

31k views

Why can't devices on different VLANs, but on the same subnet, communicate?

I have a question about switching. I have two devices connected to a switch with IP addresses 192.168.5.20 and 192.168.5.10. Both devices have the same prefix, /24. That means they are on the same ...

Jim Pap

419

asked Apr 11, 2019 at 11:16

1 vote

3 answers

1k views

how to do inter vlan for same subnet

I configure two same subnet network(ip:192.168.0.2 & ip:192.168.0.3) into VLAN...so they wont communicating with each other...but now i want them to communicate with each other... For that i ...

Shaikh Ayaan

11

asked Jul 22, 2018 at 5:25

1 vote

1 answer

3k views

Can a VLAN have hosts with IP addresses outside it Subnet IP range scope?

I have 3 entities in my network. A server,switch and an appliance which acts as a DHCP/PXE server. When the server starts up, the DHCP server has to PXE boot the server. A seperate VLAN(1234) is ...

Pavan Rajan

13

asked Jul 7, 2018 at 4:32

2 votes

1 answer

335 views

VLSM Determining Switch IP

i was given a network 130.4.0.0/16 that i needed to use vlsm on. which i did and got these vaules: Address | Mask| Assignable Range | Broadcast 130.4.0.0 | /22 | 130.4.0.1 - 130.4.3.254 | ...

James

89

asked May 9, 2018 at 2:15

1 vote

2 answers

304 views

Overlapping IP addresses in CISCO 3650

I have overlapping also, but, my config is different. Vlan 1 is 192.168.0.36/255.255.0.0 and Vlan 2 is 192.168.11.15/255.255.0.0. Since the third octet is different, how is overlapping possible?

ccrazy

11

asked Feb 26, 2018 at 20:23

1 vote

3 answers

462 views

Vlan tips? New switches (hp 2920s), single subnet or multiple subnet per vlan?

we have a series of old switches that have been failing at the company for sonme time.. i've since purchased 6 hp2920's which are layer 3 (the old ones are layer 2).. we previously didnt use vlans... ...

markm75

11

asked Nov 30, 2017 at 18:44

5 votes

2 answers

15k views

Routing Between 2 different vlans but same subnet

I have a basic doubt understanding vlan communication. Scenario: Let's say a single switch and has been configured with 2 vlans (vlan 100 and vlan 200). Vlan 100 connects to lets say 192.168.100.0 ...

user8802482

53

asked Nov 3, 2017 at 19:56

1 vote

1 answer

348 views

Subnetting a network for VLANs

Real beginner here, struggling with my first real life network problem, existing kit, and almost no budget. Two departments, which have to remain private from each other, are to be linked to main ...

Budgie

11

asked Oct 17, 2017 at 16:01

8 votes

3 answers

56k views

Why can't devices in different subnets talk with each other?

I know that the layer 2 doesn't understand IP, and the broadcast domain is same. Why can't devices talk, how does it happen?

Nina

430

asked May 7, 2017 at 19:37

2 votes

1 answer

743 views

VLAN vs Subnet in switch

For VLAN communication we need a layer 3 device. For internetwork communication, we also need a layer 3 device. Then why did concept of VLAN emerge?

Shubham Saroha

21

asked Mar 20, 2017 at 15:34

0 votes

2 answers

202 views

Separate Subnet for Each Vlan? [duplicate]

Thoughts and Query I was tring to understand Inter-vlan routing and realised, that each exsisting vlan in the switch is configured with a different subnet. Is this is a good practice or is there any ...

user10012

1

asked Dec 15, 2016 at 8:50

1 vote

2 answers

399 views

Packet transfer from one host to another

I was reading about how a packet is send from one host to another. I am confused about entries that will be made in layer-3 switch routing table. Does it contain the entries for layer two switches or ...

Patt

11

asked Nov 9, 2016 at 18:04

0 votes

2 answers

255 views

IP connectivity between hosts with differing subnet masks?

For instance, if switch A has hosts with mask /25 and switch B has hosts with /26. Will a ping from Host A to host B be successful? How does the situation change if: Both switches are connected to a ...

john

1,237

asked Sep 24, 2016 at 1:17

3 votes

1 answer

3k views

What is the point of a subnet mask on a local network?

I have a question regarding subnet masks and my understanding (or misunderstanding of them). So when a subnet mask is used, a bitwise AND is performed using the subnet mask and the IP address(es). ...

Robert Flook

231

asked May 16, 2016 at 22:23

1 vote

4 answers

4k views

Accessing devices on different subnets using a switch

I have two devices which come up with default IP addresses: Device 1 - 192.168.168.168 mask 255.255.255.0 Device 2 - 192.168.1.254 mask 255.255.255.0 I can commonly deduce that both the devices ...

Kingkong Jnr

123

asked Mar 17, 2016 at 7:25

2 votes

2 answers

297 views

What are the differences between a private network and a subnetwork?

And what are the advantages of creating subnetworks if computers are assigned different IP addresses from the same range and can communicate with each other also with switches?

yoyo_fun

1,541

asked Mar 15, 2016 at 15:30

1 vote

1 answer

632 views

VLAN and Subnet relationship with 2 offices sharing a switch

I appreciate there is an answer here already. As well as reading this and seeing this video I am still slightly confused... If a company has 2 offices (on the same floor in close proximity of each ...

ldvt5

33

asked Feb 21, 2016 at 10:33

3 votes

2 answers

3k views

VLAN tagging, routing, and general pain

To everyone who takes the time to read below, thank you very much. I want to start this off with the very general question and then give my exact situation. I really don't understand the terminology ...

Naryna

158

asked Aug 4, 2015 at 17:14

1 vote

1 answer

6k views

Creating an isolated subnet [closed]

First off; I'm not a networking expert so forgive me if anything I ask here is blindingly obvious, or I use the terminology incorrectly :) My company has recently moved office to a new building where ...

DAVco

113

asked Jul 30, 2015 at 15:00

1 vote

1 answer

95 views

Tradeoffs of an 'access network' with 30 bit subnet mask

I've got fiber lines coming into my office, with IP setup like so: Access Network 123.123.123.20/30 Our Router: 123.123.123.21 ISP Router: 123.123.123.22 At the moment the router is taking the fiber ...

bV bV

11

asked Apr 16, 2015 at 2:16

1 vote

2 answers

365 views

Multiple IP ranges at DC, how do I set this up?

I have been tasked with a DC installation of ten servers. I myself, am a software engineer and not a network engineer (welcome to enterprise!), so I am a bit puzzled over this. I have been assigned ...

adsy

145

asked Apr 3, 2015 at 12:08

2 votes

1 answer

2k views

How does Watchguard's Secondary Network work?

am a bit confused on how this "Secondary network IP address on a different subnet" work. http://www.watchguard.com/help/docs/wsm/xtm_11/en-US/index.html#cshid=en-US/networksetup/second_net_config_c....

user192702

121

asked Feb 1, 2015 at 8:50

2 votes

1 answer

720 views

Best Practice(?): 2 publicly available subnet VLANs and inter VLAN routing

I am looking for some expert networking advice on what would be "best practice" if I wanted to achieve the goal below based on the available equipment we have. Equipment: SonicWALL TZ 105 HP V1910-...

Lennon

53

asked Nov 21, 2014 at 13:24

2 votes

3 answers

7k views

Can 2 seperate lans share an unmanaged switch

Can i have two process networks using the same unmanaged switch?

DavyGravy

293

asked Nov 18, 2014 at 22:22

3 votes

2 answers

849 views

How to utilize multiple IP addresses from IP pool given by ISP

I'm still a student so please forgive me for my ignorance. I'm still learning. So I got a T1 line to practice and learn with and they gave me 5 IPs to play with. For example,8.8.8.0/29 8.8.8.[1-5]....

NetworkStudent

31

asked Aug 22, 2014 at 22:27

4 votes

2 answers

18k views

VLANs and IP addressing

I have been tasked with setting up some VLANs on 10 HP 2520 switches. This is a departure from my normal IT support area so thought I'd seek out a little advice from more knowledgable people. These ...

Paradroid

41

asked Jul 14, 2014 at 9:06

11 votes

2 answers

303 views

IPv6 Subnetting - Block RA on Switches?

I'm currently planning a v6 only small datacenter network. Imagine for now one deployment consisting of 6 racks with 12 servers per rack. Each server has 2 NICs for two physically separate networks (...

paraa

113

asked Jul 3, 2014 at 11:08

9 votes

3 answers

7k views

Generate list of subnets on switch using SNMP?

Is anyone familiar with an approach to generate a list of subnets on a particular switch (let's pick a more popular one - Cisco) using SNMP? How about a list of VLANs? If so, can you point me to the ...

Dmitri Boulanov

93

asked May 19, 2014 at 22:07

5 votes

3 answers

3k views

Is a router always necessary to link two subnets?

I am thinking especially of VLANs, which represent separate subnets that may need only one switch.

Marcos Gonzalez

1,071

asked Jun 6, 2013 at 20:59

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