1
vote
0answers
160 views

Cisco vlan entry missing in vlan.dat, but appears in running-config

One of our vlan's (ID: 104) stopped working suddenly and computers on that vlan failed when trying to obtain a dhcp ip address. On the Cisco switch if we do show vlan, this command is supposed to ...
1
vote
2answers
735 views

VLAN ingress filtering - understanding correctly and verify its functionality?

When I tag traffic wrongly on a port (to do VLAN hopping like an potential attacker) should I be able to see ingress traffic to this VLAN on the port - like by mirorring the port in question when VLAN ...
0
votes
1answer
351 views

Cisco ASA 5505: switchport VLAN assignment

Kind of a Cisco Luddite, but I'd like to assign physical switchports 0/1 and 0/2 to Vlan2 and physical switchports 0/3 and 0/4 to Vlan3. I'm assuming this is possible with base security license, ...
1
vote
2answers
3k views

How to interconnect 2 switches (Cisco/Dell) with trunks

In order to migrate to a new rack inside the datacenter I have to replicate the VLAN setup between a Cisco Switch and a Dell PowerConnect Swithch. On the Dell Switch I have 2 VLANs : vlan 10 : WAN ...
1
vote
1answer
529 views

Is my VLAN 1 a security risk?

First of all I'm relatively new to VLANs. I have a ZyXEL GS-1524 switch and two networks that I want to keep separate, but they need to use the same router. The router is on port 22, ports 17 and 18 ...
0
votes
2answers
114 views

should I add vlans and subnets to the other sites?

I have 6 sites all connected via a 20mb fiber ring. There is 1 dhcp server and wan connection at site1 and the netblock is 10.1.0.0/16 which is enormous. As you can tell all sites grab an IP from ...
2
votes
1answer
301 views

Interaction of devices with different VLAN configurations

I have an existing firewall+switching layer which is separated into per-client VLANs, with its own numbering strategy, etc. This layer is interconnected by trunk ports such that VLANs numbered on one ...
1
vote
2answers
720 views

Is it possible to assign a VLAN to an alias of network interface in pfsense?

My goal is to build a redundant pfSense cluster (as described in this article : http://doc.pfsense.org/index.php/Configuring_pfSense_Hardware_Redundancy_(CARP) The problem is that i only have 2 ...
0
votes
1answer
222 views

Multiple ethernet interfaces without PCI LAN cards

I want to have multiple Ethernet ports on my Ubuntu server 10.04. As multi port LAN PCI card are expensive, I am planning to use a cheap managed switch. The cheapest one I found was Netgear GS108T. ...
1
vote
0answers
389 views

HP ProCurve & Cisco switches interoperability

I have a couple of questions regarding Cisco and HP ProCurve interoperability. Here's a link to pdf with my network topology. Can someone help me with basic VLAN configuration in such topology? Below ...
4
votes
1answer
463 views

LAN segregation for security reasons using VLAN

I was asked to segregate the testing environment in our network to improve our security. Our structure includes: 1 switch Dell Power Connect 3448 1 switch Dell Power Connect 2748 A few 5 ports Star ...
1
vote
2answers
3k views

Vlan Management Policy Server ( VMPS) Configuration and Management

I am trying to design a topology in which I need to use VMPS and unfortunately the resources are rather few on the internet. Based on this Configuration document VMPS I have created a sample ...
5
votes
5answers
1k views

Mixing SAN iSCSI Traffic with core network traffic, Am I asking for trouble?

I am configuring a new network and had a couple questions I am finding hard to find good answers about best practices on using VLANs to separate Core network traffic and iSCSI traffic. The switches ...
1
vote
0answers
647 views

Max STP instances reached on Cisco 2950 despite not actively using 64

I have a Cisco 5505 switch running CatOS connected to a number of Cisco 2950 switches running IOS. The 5505 switch supports a large number of vlans (I'm guessing 1005), yet the 2950s only support a ...
2
votes
1answer
402 views

Connecting office to data center via Metro-ethernet

I am installing a metro ethernet link from my office to my data center. The office will have a cisco 3750 with several vlans. The data center end will have a more complicated set up. The metro e from ...
45
votes
2answers
27k views

How do VLANs work?

What are VLANs? What problems do they solve? I'm helping a friend learn basic networking, as he's just become the sole sysadmin at a small company. I've been pointing him at various questions/answers ...