Group of hosts with a common set of requirements connected as if on the same broadcast domain despite physical location

learn more… | top users | synonyms (1)

1
vote
1answer
86 views

VLAN over three switches

We are connecting three offices via fiber optics. For each office we have one switch. In each office there will be one PC which has to be isolated in a VLAN A. There will be other PCs but those three ...
2
votes
2answers
695 views

VLAN Traffic changing source when captured at firewall

1) HP Switch config below 2) Fortinet Policy in attached image Right now, we are a flat network of roughly 320 wireless devices, and about 100 wired devices. We have a FortiGate 300C firewall with a ...
1
vote
0answers
504 views

debian KVM - network bonding fails with vlan and bridge

i have a Debian 6 system configured with 2 NICs these NICs are used on a bond (bond0) which is used by bridge that require to use VLAN. i can get connection between guests running on VLAN10 but it ...
2
votes
3answers
994 views

What do I do with the default VLAN 1 on a 3Com 4210?

I am a bit confused as to how to use the default VLAN on a 3Com 4210. The switch is configured out of the box with all ports on a default VLAN 1. I need 4 VLANs on this switch: 100 - Internal WIFI ...
0
votes
1answer
527 views

VLAN & WiFi & DHCP with Cisco SG200

I'm trying to configure a small business network with one Cisco SG200-26, a Linux server and two TP-Link TL-WA801ND. I have set up the APs to have two different SSIDs, Public and Staff, and have ...
0
votes
2answers
532 views

How can I connect a VPN and VLAN via a Cisco ASA?

I'm trying to extend a VPN further into an organisation: At the main location I have a private network (call it 192.168.0.0/24) which is connected via a Cisco ASA 5510 to a Draytek ADSL router. The ...
-1
votes
1answer
397 views

Routing between Vlans on layer 2 switch and Cisco router [closed]

Hi I'm quite new to networking and need some help with a home configuration... I have an 8 port TP-Link SG3210 layer 2 802.1Q tag capable switch and a Cisco 1801 router. I set up 3 Vlans on the ...
1
vote
0answers
415 views

Ghost “vlan 0” tags added to ethernet frames in CentOS guest under OpenStack

I'm trying to debug an issue involving a KVM virtual machine instance where the instance doesn't respond to network requests when the source is on another physical machine, which is on the same subnet ...
2
votes
1answer
2k views

Configuring trunk interface in Cisco 3750 switch to allow multiple Vlans connected with Ubuntu servers having a single NIC (sub-interfaced)

I have 3 Ubuntu servers (each having only 1 NIC) for my openstack cluster configuration following the guide of http://docwiki.cisco.com/wiki/Cisco_OpenStack_Edition:_Folsom_Manual_Install I also have ...
0
votes
0answers
117 views

Is it possible to set up a management VLAN on HP switches without configuring routes on the WAN routers?

The network I help manage/maintain is configured like so: Location A - 10.0.0.0/22<br /> Location B - 10.0.4.0/22<br /> Location C - 10.0.8.0/22<br /> etc. Our ISP owns and ...
1
vote
1answer
157 views

Isolating Ethernet ports on a Cisco Nexus 5000

We have several machines plugged into various ports on a Cisco Nexus 5000. We want to separate the switch into groups, so a handful of machines can see and talk to each other and no one else. So, to ...
1
vote
1answer
234 views

Default Gateway in a VLAN

Could I have a router/firewall device providing WAN connectivity, part of a VLAN on a switch? For example: 2, L3 Switches. 2 VLANs DefaultVLAN 10.1.1.0/24 VLAN100 192.168.1.0/24 Two ...
1
vote
1answer
513 views

VLAN Gateways and Routing

This for hypothetical purposes - more of a learning question than an production question. If I have switch (Layer 3, lets say a Procurve) with a handful of VLAN's configured. Lets say: DEFAULT VLAN ...
0
votes
0answers
36 views

ASA 5505 base license and Voice vlan [duplicate]

My current setup contains a cisco asa 5505 with two cisco sf300-24p switches, the data and voice vlans have been setup on the switches and I've started to setup the needed vlans on the ASA, but it ...
0
votes
2answers
86 views

Placing WAN Subnet on a VLAN?

I have several hosts I want to connect directly to my WAN subnet, eg., 1.1.1.1/29 (web, mail, and router for LAN). I have a web managed switch (DGS-1210-24), and was wondering if there were any ...
0
votes
2answers
211 views

Can I use a software router to filter traffic coming from a Cisco router?

I have the following topology working but i would like to be able to filter the traffic using a software router such as Zentyal. Current [INTERNET] === [Cisco 2600] ===[Cisco Switch] === [Machines] ...
1
vote
3answers
3k views

vconfig not tagging outgoing packets with vlan tag (Ubuntu)

I am trying to experiment with a vlan interface on my desktop ubuntu machine. The desktop has only one single interface (eth0) connected to the company LAN. After using vconfig to create the vlan ...
2
votes
2answers
1k views

VmwareESXi Vlans, Cisco devices and broadcast making the things odd

I'm having problem for some days trying to make a correct configuration Right now I have a Cisco Catalyst switch, a Cisco Router 2811 and a VMware ESXi node with 4-8 VM (Linux,BSD, Windows), each ...
0
votes
2answers
166 views

What types of security threats does a vlan protect against? [closed]

I'm learning about vlans. The literature says that they provide improved performance and security by segrating the physical network into separate "virtual" networks. I understand the performance ...
1
vote
0answers
63 views

VLANS and Public/Private Traffic

I may reveal some ignorance with this question, but I am really confused. We have 3 static IPs and one gateway/modem with my organization. The gateway/modem is located in a remote area of our ...
2
votes
2answers
907 views

Should I add a layer 3 core switch or just use the router I have

I just started as the network admin at this company a month ago and inherited this infrastructure. (Router should be labeled 2921, not 2920). Link to see image full size: ...
0
votes
1answer
131 views

Assigning reserved DHCP addresses from multiple subnets/scopes to VMs on a single ESXi host

I assume this is possible by connecting one of the NICs to a VLAN from each subnet, or perhaps the helper IP takes care of this organically, but my question is, with one single ESXi host, and 3 VMs on ...
1
vote
1answer
177 views

Configuring a firewall appliance with 2 VLANs - how are the outbound links on the firewall configured?

We just ordered a sonicwall NSA 4500 firewall and I am preparing a network diagram for its arrival. We have 12 servers in a newly setup rack, a 48-port switch, and a Sonicwall NSA 4500 firewall I ...
0
votes
1answer
380 views

Cisco SG300 switch with VLANS [closed]

I have a SonicWall firewall configured with 3 vlans on virtual interfaces on one physical interface. I have a wireless access point configured with 3 wireless networks configured to each of the three ...
0
votes
3answers
145 views

Cisco 2900 configuration

I agreed to help a non-profit figure out their network woes. Nothing had been documented and the folks that set the system up aren't available. Wires were cut and left hanging. The organization has ...
1
vote
2answers
941 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
2answers
402 views

Do I need a “smart switch” for VLAN support / VLAN for Multi-WAN?

I have a need to connect a branch office with multiple WAN's to multiple devices: wan1 modem Public IP: 2.2.2.2 Private IP: 192.168.20.1 VLAN tag: 20 wan2 modem Public IP: 3.3.3.3 Private IP: ...
2
votes
1answer
127 views

Segmenting Virtual Network Traffic

I posted this on IT Security but thought it may be more appropriate here. I'm still not sure about cross posting etiquette, so anyone with high enough rep, please feel free to migrate this question ...
0
votes
1answer
78 views

Check if Vlan is accesible through the firewall

I want to check if a Vlan (10.253.240.11) is accesible to Our network thorugh the firewall. I've logged into the fw through Linux console, I run the command route -n | grep 10.253.240. To find out ...
0
votes
1answer
220 views

Multiple VLANs - how Linux / Debian process packets

I can't find answer about how linux processes incoming packets from different VLANs, that do not belong to a subnet assigned to a VLAN. Imagine this situation. On Linux machine with the following ...
1
vote
1answer
636 views

VLANs Across 2 Switches with a Single Trunk

I'm trying to create two separate networks spanning two switches using a single connection between the switches (Netgear GS108Ts). It seems like the way to do this is to setup 2 identical VLANs on ...
0
votes
1answer
553 views

Getting invalid input error on procurve 2510 when setting up ip helper-address

I have 3 HP Procurve 2510G-48 and I want to setup a VLAN for public wifi (VLAN100). Originally I just had the default vlan1. I have computers communicating across switches on VLAN100 with static IP ...
1
vote
1answer
2k views

Is it possible to configure trunking between a NetGear Switch and a Cisco Router?

Hardware: Cisco 2921 Router Netgear GS752TXS Switch. Tags data with either Vlan1 (192.168.1.0/24) or Vlan2 (192.168.2.0/24) depending on mac address. I want the cisco router to perform ...
0
votes
2answers
1k views

Broadcast traffic on large vlan in numbers [closed]

I'm looking for the magic number of how many clients make sense to have on a single VLAN, before the broadcast traffic becomes a real issue. Preferably, I'd also like to know what a good number of ...
1
vote
2answers
107 views

3 dedicated wires for 3 VLANs between two switches: (M)STP failing

looking for a couple of hints from you we have a small but peculiar networking need: - 3 vlans, that are to be propagated among two L2 switches - we need to partition the vlans as much as possible, ...
1
vote
2answers
452 views

How to manage isolated/dedicated iSCSI network?

This is more of iSCSI switch setup question. I have an isolated iSCSI storage network which includes 2ea managed switches, and setup for redundancy. I could just connect a management pc to one of ...
0
votes
2answers
896 views

XenServer 6.0.2 and Cisco 3550 vlan configuration

I am running a couple of xenserver 6.0.2 hosts with multiple vm's on them. All the xen hosts have 4 physical network ports connecting to the cisco. Each port is untagged in xen but is tagged to a vlan ...
0
votes
2answers
235 views

VLAN centralised management

I wonder if there is a proper way to setup a 10 DLINK switches VLAN system. My aim is to have one computer/central switch that would broadcast the whole VLAN setting across the other switches and as ...
0
votes
1answer
238 views

Debian Network boot with a VLAN (DHCP + TFTP)

I've been given 34 servers (HP Proliant) to use for HPC. Due to the server owners' request, 33 of these will need to act as diskless thick clients, and one will act as DHCP and TFTP server to enable ...
2
votes
1answer
4k views

InterVLAN routing on a HP V1910 series switch

Recently bought a HP V1910-16G switch (former 3com 29хх) with IPv4 routing capabilities. After unpacking I did a firmware upgrade to the latest 5.20 Release 1513P06. I did set up additional VLANs (#2 ...
1
vote
1answer
127 views

VLAN configuration

I have two 24 port 3Comm 2928 managed switches along with several smaller unmanaged switches. Additionally, each user has a VOIP phone that acts as a switch so both phone and PC can plug into the same ...
1
vote
0answers
619 views

PFSense VLAN's - clients cant access devices on a defined VLAN

I'm having an issue setting up pfSense with VLAN's, basically, the pfSense boxes can ping the devices on the tagged vlan, but clients routing through pfSense cannot. There are two Cisco SG500 ...
1
vote
2answers
1k views

2 DHCP servers, VLANs, Mitel 3300, Sonicwall TX 215 conflict

Inherited a system that has likely not been properly maintained for about 10 years. Add to this that the firewall had to be replaced because the original one was not accessible because the former ...
0
votes
2answers
1k views

How to forward a TCP/UDP broadcast to another VLAN on a Cisco switch?

I have client software which sends out a broadcast on some TCP and UDP port numbers. The broadcast it sends out is designed to look for the server. But the server is sitting on another VLAN so the ...
2
votes
1answer
204 views

Intermittent connectivity problems for servers on VLAN 1 with spanning tree

Recently we implemented spanning tree and redundant links in our infrastructure. This has resulted in systems on the default VLAN having intermittent connectivity problems when I plug in the backup ...
0
votes
2answers
699 views

Switch sending DHCP packets to wrong VLAN

I have a basic remote site with a Cisco Catalyst 2924XL switch. There are 2 VLAN's at the site: 1 Default 2 Wireless There is a single server connected via a single ethernet cable, VLAN 1 is ...
1
vote
3answers
7k views

Duplicate MAC address on the same LAN possible?

Let's say someone is on the same network as me and spoofs their MAC address to match mine: Is this possible? Can two or more clients with the same MAC address be on the same network at the same time ...
1
vote
1answer
141 views

Physically isolated networks versus link aggregation + VLANs

When setting up internal cloud, the recommended best practice seems to be to isolate data traffic from management traffic by using separate L2 networks. For example, see the diagram in the OpenStack ...
1
vote
2answers
462 views

ASA, 2 WAN connections

I need help about configuration firewall ASA 5505 connected to 02 wan connections interface Vlan1 nameif inside security-level 100 ip address 192.168.254.1 255.255.255.252 interface Vlan2 ...
1
vote
1answer
2k views

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 ...