Browsing articles tagged with "vlan - Admins Goodies"
Dec 26, 2012
tom

VLAN security compared to DMZ

I found this question very illuminating about DMZs and when to place a server in one. We’re re-organizing our internal company network (keeping the same external IPs and domains), our mainly Windows servers (we use WinAD heavily) will be kept on the LAN with firewalls and port forwarding to direct external traffic. What are the security (dis)advantages setting a server (example: email) up on a different VLAN to the rest of the internal network rather […]

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Dec 11, 2012
tom

Router and Switch VLAN Configuration for Isolated Network

I haven’t worked with VLANs much in the past and I was hoping if I could get a good explanation of what I need to setup for this to work. I have a Netgear WNR2000v2 router and a Netgear GS108T smart switch currently in my network. The fourth port on the router connects to port one on the switch. I would like to be able to isolated port 8 on the switch for use as […]

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Nov 3, 2012
tom

DHCP for Multiple Subnets

So this is the current setup – essentially I would like to get my DHCP server, serving DHCP requests for two seperate subnets. Netgear DG834G acting as a modem connected to a Sonicwall Pro 2040. X0 – LAN – 192.168.1.0/24 X1 – WAN – <WAN-IP> X2 – WLAN – 192.168.10.0/24 At the moment, I have a 2008R2 server with DHCP installed, with an IP address on the 192.168.1.0/24 range handling DHCP fine for this subnet. […]

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Oct 2, 2012
tom

PowerConnect 2848 , vlan configuration with AP

Good day, I need to configure two vlan on an AP connected with a Dell PowerConnect 2848. The first one is up and running (let’s say vlan x) , the second one is a completely different network (vlan y) , provided by a Gateway-DHCP wich i have no access, directely Patched (via patch panel) at a secondo AP device. So i cannot just plug this Gateway device on my switch without tagging traffic before, for […]

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Sep 21, 2012
tom

How to set up VLAN network

I’m changing my network from having every device on flat network to using VLans. My problem is that we already have a lot of devices on this network(192.168.20.0/24). From theory, I read that each Vlan has to be a different subnet and then I need to configure virtual interfaces on my Cisco router to cater for inter vlan routing. 1) How can I segment this network with minimum down time on the devices already on […]

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Aug 26, 2012
tom

Provide Internet access for different VLAN

I have several managed switches at work that connect all computer within our office to the ADSL modem. However I would like enforce a VLAN policy to isolate traffic within the network. Through my previous studies of the CCNA certification it has come clear to me that I would require a router. The router would facilitate routing traffic back and forth between the different VLANs and the ADSL modem. However I have a limited budget […]

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Jun 30, 2012
tom

Configuring vlans on Cisco SG200 series switch with Ubuntu server

I created a vlan on Ubuntu with vconfig tool with 21 as id and eth1 as the host port. I connected eth1 to one of the ports on the swtich (GE23) as all ports trunk by default. In the webgui I created a vlan named test with the id 21 and I made GE2 are port as an access port. In port to vlan mapping I selected vlan 21 and added it port GE2 by […]

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Jun 24, 2012
tom

Regarding the VLANs and their uses

What are virtual LANS. And why we need them? As far as i have understood them when switches are been used to create broadcast domain between two different LANS. Then a switch could be used to connect both of the LANS. So they share the same broadcast domain. Because a switch forwards packets which are broadcasted to all of its interfaces. Please elaborate more. Many many thanx in advance Asked by Luv Virtual LANs are […]

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Jun 24, 2012
tom

Using Juniper EX3300 as a router

So I have a Juniper EX3300 Switch. One of its uplink ports (ge-0/1/0) is connected to my ISP’s router. ISP router’s port address is xx.xx.xx.109. My switch’s IP address is xx.xx.xx.110. From the switch, I can ping to xx.xx.xx.109 and any other IP in the world. I mean its connected to the Internet. I connected the port eth0 of a computer (running Ubuntu) to the port ge-0/0/0 of the switch (which in the same VLAN […]

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Jun 3, 2012
tom

Isolate clients on same subnet?

Given n (e.g. 200) clients in a /24 subnet and the following network structure: client 1 \ . \ . switch — firewall . / client n / (in words: all clients connected to one switch and the switch connected to the firewall) Now by default, e.g. client 1 and client n can communicate directly using the switch, without any packets ever arriving the firewall. Therefore none of those packets could be filtered. However I […]

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