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-1
votes
0answers
19 views

Server with high load in I/O [on hold]

I´d like to find some hardware to make tests to measure the connection speeds of network elements (up to 10 lines in parallel). Each of the connections is of about 300 Mbps, and I´d like to measure ...
-1
votes
1answer
54 views

Designing a secure network layout

Over the last few years I've accumulated a lot of hardware that all currently exists on a flat network. There are a number of devices: my desktop, laptop, and computers of the rest of the people I ...
1
vote
3answers
93 views

Switch behavior on unicast packets when the destination is unknown

Please let me start by saying I am no network expert, I am a programmer who does a fair amount of L3/4 programming. My question is that when a switch receives a packet with a destination MAC that is ...
6
votes
3answers
146 views

Cisco Dot1x Port Authentication - VLAN selected based on what domain the user logs on to on computer?

Currently my company has been bought out by another. Due to this, another two companies users will be migrating into our office. It would be super handy if we could have the vlan chosen for the user ...
13
votes
1answer
1k views

What would cause SIP traffic to be seen going into a switch but not coming out?

Background I have been struggling to get my SIP phones to register behind a brand new router and switch in our brand new office. Our PBX is hosted offsite. I have worked with our provider to attempt ...
1
vote
2answers
32 views

What do other nodes do with a switch's packets the first time the packets are sent out? [closed]

I'm a total newbie here and don't know much of anything about Routing and switching, Servers and the like.. so my questions might seem very newbie but please bare with me. When it comes to Switches ...
1
vote
1answer
111 views

Netgear XSM7224S / DLink 1210-48 Static Lag (Trunk Failure)!

I need to configure a Netgear Switch(XSM7224S) and DLink Switch (DL1210-48) with two trunk ports. I did the same and created a lag (static) between them, afterwhcih a reboot was performed on both of ...
2
votes
0answers
227 views

Configuring LACP across a IBM B50G switch stack

Is it possible to configure LACP (Link aggregation control protocol) that spans across two IBM B50G stacked switches. Below is an illustration of what I am trying to accomplish. I have currently ...
1
vote
2answers
55 views

LAN routing without vlan tagging?

On my old Allied Telesis router I had a single interface for internal traffic. I had multiple networks talking on this one interface. For example 192.168.2.X was vlan 1-2, and 192.168.3.X was vlan ...
1
vote
2answers
91 views

Avoiding switch loop

Will I have loop problems with this topology because S2 and S3 are both connected to S1 and s4 ?
2
votes
3answers
108 views

Network Switch for Web Application

I'm migrating a web application from a single server to a three server config, two running the database and one the web tier. I need to purchase a network switch to string these servers together ...
0
votes
1answer
39 views

Seeing odd (to me) packets in a network capture

This morning I connected a system to our switch connected to our ISP handoff in order to do some wiresharking. I had yet to set up any port mirrors, and confirmed that there were none in place. ...
-1
votes
1answer
108 views

Switch Loop with Dual NICs?

If I connect two unmanaged Linksys workgroup style switches together (port to port) then I take two NIC's on a server and plug one into one switch and the other into the other switch, will this create ...
1
vote
0answers
163 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 ...
2
votes
1answer
854 views

ESXI 5.1 - Unable to trunk to cisco switch

I have configured my esxi host vSwitch1 to use the secondary NIC on my VMware host. On vSwitch1 configuration I have set the VLAN to 4095 which specifies to allow all VLANs. If my cisco switch port ...
0
votes
2answers
740 views

LACP Aggregation between Cisco C3750X and HP JD990A

The interface on the JD990A is very cut down. There is a serial console with minimal commands and a web interface. The 3750 is in a 2 switch stack and I am trying to configure cross-stack link ...
0
votes
1answer
273 views

Juniper networks mac addresses of switches in a LAN

I have a LAN consisting of switches connected to each other then to some devices, How to get the mac address of the switch connected to a specific port on the main switch then get the ports and device ...
3
votes
3answers
4k views

Access ports versus trunk ports?

Can someone please explain the difference between access ports and trunk ports on a switch? I'm starting to learn networking, and my understanding is that access ports are used to connect endpoints ...
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 ...
-2
votes
1answer
67 views

Layer 3 switching in data center [closed]

I have currently 3 uplink ports in the data center with 3 different subnets. They connect to 3 servers. I want to make it only 1 uplink and connect it to a switch so ip addresses can be accessible ...
2
votes
1answer
128 views

Connect Dlink xStack DGS-3420 stack to a Brocade Stack

I'm currently having difficulty determining the best way to connect a Dlink DGS-3420-52T switch stack to a IBM B50G switch stack. I have two IBM B50G switches stacked together, which then connect to ...
1
vote
1answer
318 views

How do I span my WAN subnet to my L3 switch using SonicOS L2 bridge mode? (Sonicwall and JunOS)

I have two sets of ESXi hosts, one set for management and one for tenants. Each ESXi host has 8 nics and four vSwitches. All vSwitches are trunked via aggregated interfaces to a pair of EX in VC mode. ...
2
votes
1answer
577 views

Networking Cisco: adding 3750 Switch to existing Stack

Can any one advise about what will happen to my existing switch stack when adding an additional slave switch? I'm trying to confirm whether this will cause a temporary outage to my network or will ...
0
votes
1answer
128 views

Is Cisco Misquoting the Nexus 7000 specs [closed]

Looking at the following image: http://blogs.cisco.com/wp-content/uploads/7000-family-550x358.png Cisco is quoting the 7009 as having a 10GigE density of 336 and a backplane bandwidth of 550G/slot. ...
2
votes
1answer
172 views

Is a Fabric Module required for a Nexus 7009, or is it part of the Chassis?

I noticed that Cisco lists separate fabric modules for the Nexus 7009 switch. If I were to simply buy the Nexus 7009 Chassis (N7K-7009), what would I need at minimum? I just want to confirm, but I ...
1
vote
2answers
754 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
83 views

Downgrade small law firm from DC to samba or workgroup?

I've got a law office of about 12 attorneys and 22 total users. Their email is hosted (Kerio), the workstations are XP Pro with Office 2003 (soon to be replaced with win7 boxes with Office 2010) and ...
5
votes
5answers
3k views

Hubs/switches taking out switches?

Here's the issue...we have a network with a lot of Cisco switches. Someone plugged in a hub on the network, and then we started seeing "weird" behavior; errors in communication between clients and ...
0
votes
1answer
52 views

fiber networking: making sure I understand

Im costing out a network in a building that has multi-mode fiber already available. It's entirely unused and requires switching in multiple locations to make a working system. I want to make sure ...
1
vote
0answers
457 views

Network topology change every 2 seconds

I'm having some weird troubles with our smb network. There isn't any documentation about the structure/devices or which cable is attached to which wall socked and I'm discovering lots of weird stuff. ...
2
votes
2answers
506 views

Cisco Sticky Mac vs Juniper Persistant-Mac

I’m trying to figure out if there is an inherent flaw in the way JUNOS handles sticky-mac addresses across their switch-ports versus how Cisco handles them. I’ll elaborate. Below, you can see that ...
1
vote
1answer
274 views

Do you backup a single switch or each switch on a extreme summit to tftp server?

I want a backup of my switching environment, so I looked up how to backup a system configuration file.I just uploaded a configuration file to my Tftp server and it completed just fine. I was wondering ...
2
votes
0answers
185 views

Inexplicable STP Behaviour

I have a problem with a couple of Dell PowerConnect 6248 switches (latest firmware) connected to a pair of external (3rd party) switches providing Internet connectivity via HSRP. I'll post more ...
1
vote
2answers
281 views

Assign all VLANs on a same port on HP procurve switch

i'm looking for this information for a few hours on the web but i still can't find the answer. I have a few HP2610 switches (no stacked) and i want to assign all VLANs to switches interconnection ...
1
vote
2answers
124 views

servers connected to a poweredge 6248 receive traffic for their 'neighbours'

In the network we have a few vlans but at the moment I was investigating vlan2 which carries the most traffic. When tcpdumping on the eth0.2 interface, I see a lot of packets arriving which are not ...
4
votes
1answer
294 views

Should the MAC Tables on a switch Stack be the same between sessions?

According to Cisco's documentation: "The MAC address tables on all stack members are synchronized. At any given time, each stack member has the same copy of the address tables for each VLAN." ...
0
votes
1answer
359 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
1answer
159 views

Have to run auto-negotiate between clients and switch - “old” switch works fine - “new” switch results in “port flapping”?

I need some help understanding a problem we're having at work: We run Altiris/Deployment Solution and have to use auto-negotiate between client systems and our switches (Altiris apparently requires ...
2
votes
1answer
812 views

Switch flooding when bonding interfaces in Linux

+--------+ | Host A | +----+---+ | eth0 (AA:AA:AA:AA:AA:AA) ...
1
vote
0answers
656 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 ...
5
votes
2answers
2k views

Fault Tolerance with 2 HP ProCurve 2824 Switches

Looking for some advice on our current situation. We have a full rack at a data center that contains 1 uplink to the data center distribution layer switch (we don't control this), 2 HP ProCurve 2824's ...
2
votes
2answers
629 views

Setting up 2 x switches in a blade server (BX600) - First time

I have the following items: Primergy BX600 MMB3 10 x BX620 S4 2 x Switch Blade (PG-SW107) QNAP (TS-EC1279U-RP – QNAP) (4 x Gigabit Connections) HP Pro curve Switch (2510g-48 (JA9280-A)) Patch ...
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 ...
2
votes
1answer
203 views

Sizing Switches for Storage and Production

Couple questions. Should you always completely separate the storage network switches from production switches or are VLANs fine to segment this traffic? Is there a golden rule here? How do you ...
1
vote
1answer
537 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
304 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 ...
0
votes
1answer
64 views

Best way to handle a mail server's change

I need to install a new mail server on my company. Now I'm using a very very very old version of sendmail on redhat. I've installed on a new server, ubuntu with postfix and dovecot. I'm using a 3th ...
2
votes
4answers
694 views

Trunk fiber ports on switches

We are planning to purchase new switches for our network. We have three buildings in the same area that are all connected by fiber. Our main building is very large and needs to be connected by fiber ...
1
vote
2answers
731 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 ...