DELL 2816 - Benefit Of Setting Up VLANs If Subnets Wired Separately
Jun 12, 2013
I have 2 sub nets within my office: 172.16.1.0/24 and 172.16.2.0/24. All devices on each subnet are wired independently from each other into the server closet. Previously each sub net had it's own switch in the closet to connect to that sub nets servers. We are replacing the 2 switches with a single Dell 2816 managed switch.
Is there a benefit to setting up the switch with 2 VLANs over just letting everything pass through the switch in un managed mode?
My only security concern is this: 1 sub net has access to the internet while the other does not. Does setting up 2 VLANs provide additional security by preventing 1 subnet from accessing the other? In other words, if a computer with internet access gets hacked will it being on one side of a VLAN prevent the hacker from accessing the other subnet?
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Dec 4, 2012
You have to make 4 subnets for 4 VLANs, the router interface assigned to each VLAN is the LAST usable host on the subnet.so unless I'm really bad at networking the graph should be:
NET ID // HOSTS // BROADCAST ADDRESS // VLAN
192.168.0.0 // 192.168.0.1 - 192.168.0.62 // 192.168.0.63 // VLAN1
192.168.0.64 // 192.168.0.65 - 192.168.0.126 // 192.168.0.127 // VLAN2
192.168.0.128 // 192.168.0.129 - 192.168.0.190 // 192.168.0.191 // VLAN3
192.168.0.192 // 192.168.0.193 - 192.168.0.254 // 192.168.0.255 // VLAN4
So if I'd have to write down a single host configuration for VLAN2..I think it should be:
IP: 192.168.0.65
subnet mask: 255.255.255.192
default gateway: 192.168.0.126
Is this correct? I'm not sure whether the default gateway should be 192.168.0.255 (as would with normal subnets) or as I wrote down 192.168.0.126, this is the first time i've ever gotten assignments including VLANs and I havn't really gotten a solid explanation.
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Oct 1, 2012
I have a pair of Core VSS 6509E SUP 2T. Two different LANs, two diff. Subnets. larger LAN has been connected to the VSS pair usng normal SVI and Post-Channles (has lots of closets 3750 stacks) and no problem. Second LAN, two closets, stacked and connected to each other via Port channel and trunk + SVI interfaces. Now, I have SVI interfaces for both LANs on teh VSS pair and that is causing traffic from one LAN to jump over to the other VLAN and rightly so because the VSS pair see both subnets as directly connected subnets. I was wondring if I delete the SVI for the second LAN and only keep the L2 VLAN this will be resolved> The reason for the second LAN to connect to the VSs pair is only that It has to go through the VSS pair to get to the WAN router (both LANs will go out through this Same WAN router) but WAN router is not my concern at this time. I need to isolate these two LANs/subnets traffic so no one VLAM traffic jumps over the other.I have also thought about VRF but at this point I am not sure if teh 3750 stacks supports VRF and if it does how to implement VRF on the second and samller LAN to just allow it go through the VSS pair in order to get to the WAn router.
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Aug 26, 2011
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Oct 24, 2011
With traditional classful subnetting, the same number of host bits is used to designate the subnet ID for all the resulting subnetworks. This type of subnetting always results in a fixed number of subnets and a fixed number of hosts per subnet. For this reason, this is known as fixed-length subnetting. The decision about how many host bits to use for the subnet ID is a big planning decision. There are two considerations when planning subnets: the number of hosts on each network, and the number of individual local networks needed. The table for the subnet possibilities for the 192.168.1.0 network shows how the selection of a number of bits for the subnet ID affects both the number of possible subnets and the number of hosts that can be in each subnet. One thing to keep in mind is that in all IPv4 networks, two host addresses are reserved: the all-0s and the all-1s. An address with all 0s in the host portion of the address is an invalid host address and usually refers to the entire network or subnetwork. An address with all 1s in the host portion is used as the local network broadcast address. When a network is subnetted, each subnet contains an all-0s and an all-1s host address that cannot be used for individual host addresses.
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Dec 21, 2011
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I have:
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After setting up the subnet and assigning an ip to the 1810, everything else just worked out of the box. I would imagine that I should segment and prioritize the network so that the VOIP traffic is isolated and is higher priority from everything else.
I tried playing around a bit, but the phones lost connectivity, so I just defaulted everything back for now.
What would the suggestions be for setting up the VLANS properly to do this?I would also need one of the office PC's (say the one plugged into port 13 of the 1810) to be able to access the asterisk server.Also, would it be more optimal to have the asterisk server on the PoE switch or the main switch?
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vlan database
vlan 10,78,666
exit
interface vlan 1
ip address 172.16.10.11 255.255.255.0
[code]....
Ports gi1 can talk to each other and access the blob but ports 25 refuse to talk to each other. But as soon as I remove the access links to the blob they can! Obviously, at that point port gi1 lose access.Is such a topology feasable or even advisable?
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What I have unsuccessfully tried to achieve and am currently trying to separate the networks so that both families can access internett, but at the same time it must be impossible to access VLAN1(Family A) from VLAN2(Family B) vice versa. Meaning no communication between the two families through the local network.
I have tried different options but I am not sure how to deal with trunk, tagged, untagged etc. etc. etc. It seems every time I manage to create two different networks there is still accessability/communication between the two VLANs and everytime I manage to give out different IP adresses to different ports i.e. 192.168.10.xx and 192.168.2.xx it is still possible to communicate. What also usually happens is that the internetconnection is severed at the same time.
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Mar 10, 2013
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