a device that bridges network segments, operating at the OSI link layer level.
5
votes
0answers
49 views
Why do I need to assign static ip address to the bridge and not to the physical interface?
I have bond0 with two physical interfaces in it.
Normally I used to assign static IP address to this bond0 to set up internet connectivity on the server.
Now, because of LXC virtual guests, I had to ...
5
votes
2answers
56 views
Modular Switch: swapping modules
This weekend I'm planning to (at long last) take a bunch of a equipment off of a hand-made (2x4s and plywood) bench and mount it all in a proper rack. One of the items to move is an HP 5406zl modular ...
0
votes
0answers
27 views
Dell PowerConnect 6248 10GB Modules
Does anyone know if the dual 10GB BaseT module ports fitted in a Dell PowerConnect 6248 switch can be used to connect to an ISCSI SAN rather then up linking between switches?
-3
votes
0answers
46 views
How to connect 5 different networks together? [closed]
I have a network consisting of three servers in a data center, all of which are connected to each other via a switch.
In addition to this I need this network to access 4 additional networks, most of ...
0
votes
0answers
14 views
Baystack 325 24T: can't serial or connect via IP
Have a couple of old BayStack 325 24T switches. One of them is flashing all amber on all the port lights, the other doesn't seem to have an IP and is not responding via serial connection; just a ...
20
votes
2answers
490 views
What kind of network attack turns a switch into a hub?
I read an article today describing how a penetration tester was able to demonstrate creating a fake bank account with a $14 million balance. However, one paragraph describing the attack stood out:
...
0
votes
1answer
77 views
35 times increased latency between data send rate of 1 millisecond vs 100 microseconds. WHY?
Experiment
hping -S --data 100 -c 100 10.56.1.2 -i u100 round-trip min/avg/max = 0.5/14.0/15.8 ms
hping -S --data 100 -c 100 10.56.1.2 -i u1000 round-trip min/avg/max = 0.3/0.4/4.8 ms
Observation: ...
0
votes
0answers
18 views
link (trunk )2 home switch together [migrated]
Can i link two home switch (not professional like cisco) togeher in this way:
router 1 -> switch 1 -> switch 2
router 1 -> switch 2 -> switch 1
I want that when switch 1 goes down i still have ...
1
vote
2answers
54 views
Any good apps to visualize what's happening on an iSCSI Storage network
I'm a developer/SQL type person that has inherited an iSCSI SAN/Vmware setup in the past year. HP Lefthand P4500 SAN. Single iSCSI switch - HP Procurve 2810. Dell Equallogic PS6010E 10gb SAN (not used ...
0
votes
0answers
12 views
Linksys srw2048 websmart switch - changing ip address
This is probably dead simple but I've never played around with a serial console on this thing before. I am trying to enter a new IP on our subnet of 10.0.1.253 and right now the default is in there ...
0
votes
1answer
26 views
Difference between a VMWare vSwitch and a Cisco Nexus 1000 switch
I keep hearing colleagues talking about how VMWare's vSwitch and Cisco Nexus 1k switches are analogous. Can someone tell me how they are similar? And which is better among the two for a data center ...
0
votes
1answer
56 views
OpenVPN pass through to lan and out second internet connection
I asked on SuperUser, was told it might be best to ask on here, so here we go.
I want to run OpenVPN on a computer connected to a FiOS connection on one NIC, then pass that traffic onto the LAN, and ...
-2
votes
0answers
31 views
“Lite Touch” Switch Network Deployment Options [closed]
While this is question is not for a typical corporate IT setting, I believe it can be inspired by IT best practices.
OVERVIEW
I am working on a product where every unit we deliver does integrate a ...
0
votes
0answers
31 views
Switch Linksys DHCP offering lease without sucess
I have a Linksys switch srw224g4 with 4 vLans. It´s connect to my router MIkrotik RB450G.
The VLANs work fine, when I plug my notebook with Win7 to any port, it gets the correct IP and everything ...
0
votes
3answers
49 views
Connect to cisco switch using shell script
I would like to run a daily script the cleans my switch arp.
I enabled SSH on my switch.
how do I connect to the switch using a simple shell script?
I'm not sure how to provide the SSH password and ...
3
votes
1answer
127 views
Calculating backplane capacity of a switch [closed]
Why is it that people always say that for a switch with ports in full-duplex mode you need portcount times bandwidth times two for the backplane capacity?
Let's have an example. Take a 4-port 1Gb ...
0
votes
1answer
59 views
meaning of 1GE/5GE SFP in Cisco Switches
What is meaning of "1GE/5GE SFP Ports" in switches. What does it stand for? I dont have much knowledge of networking, but I just wanted for information.
Thanks
0
votes
2answers
48 views
Looking for Cisco router/switch logs that would be related to an outage
I have a main router with several other switches connected to it. The network went down and when I consoled the main router, it was sluggish. Rebooted it, but once the interfaces where the other ...
0
votes
3answers
57 views
Cheapest Way To Stack 48 Port Switch With My Dell 6248?
I have a Dell 6248 managed switch with 48 1 GB ports. I'm out of ports and would like to add an additional 48 1GB ports. The official Dell-Recommended solution is to get another 6248 and link the ...
0
votes
1answer
18 views
Managed switches and WFilter
we are looking to use WFilter to monitor workstation traffic, it looks like we need a router or switch that does port mirroring, now would that mean we need a managed switch? And if so, would all the ...
-2
votes
1answer
45 views
Cisco Switch VLAN vs ACL [closed]
I am trying to create a VLAN in which my PS3 can access a remote PC that feeds it video. I want my PS3 not to be able to communicate to the internet, and be able to move that remote PC into the same ...
1
vote
1answer
59 views
Cisco switch default gateway
I have a Cisco 3550 Switch (with an EMI) image. I seem to be stuck trying to figure out if the switch has a possibility of setting IP addresses (i thought Layer 3 switches could do that). I want to ...
-2
votes
1answer
25 views
Connecting vmware on two computers [closed]
I have a switch and 2 computers, each one has vmware with a running centos 5.8 on.
what i am trying to do is ping centos2 from centos 1 through the switch(10\100).
please help.
0
votes
2answers
49 views
Duplicate IP on network and layer 2 devices caching
I have two identical VMs (Windows XP guests). I use KVM for the hypervisor. The first one is running, the second is a clone of the first not yet running. I edited the config for the second one to ...
0
votes
1answer
31 views
Misunderstanding about packet travel over NLB-Network
I'm doing a LAB about NLB(Network load balancing) on Windows Server 2008 - Unicast mode.
But I can't understand how the packet travel across the Network...
...
0
votes
1answer
57 views
What would my over subscription be for my network?
I have 24 racks with 20 servers each connecting to 2 by 48 x 10G switches in each rack (NIC teaming). The switchs then connects to another 2 by 48 x 10G switches in 2 aggregation racks.
What would ...
1
vote
2answers
45 views
How can I tell if Cisco switch is running PVST or PVST+?
On a Cisco 6503 switch, if I run "show spanning-tree summary", it says, "Switch is in pvst mode".
How do I know if this is PVST or PVST+? Would it have specifically said PVST+? Or does it depend on ...
0
votes
2answers
167 views
24 Port Switch versus 4 x 8 Port Switch
While prices for switches in the end-customer sector are decreasing, I found that 24 port switches are much more expensive than multiple 8 port switches with the same speed.
Are there any ...
1
vote
1answer
57 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 ...
0
votes
5answers
175 views
New office cabling: should we use CAT7 or CAT6a? [closed]
We are going to do the cabling in our new office building and we are thinking to lay down 10Gbit cables since we use HP switches that come with 10Gbit ethernet ports. We will also lay down few fiber ...
0
votes
1answer
51 views
Programmatically interfacing with Managed switches (Cisco 3750)?
I work at an organisation that has a few thousand computers and around 100 switches. To help with the stock take for the computers I would like to programmatically access the managed switches to find ...
0
votes
0answers
53 views
Does anyone know how to configure a 3Com 4210 switch?
Does anyone know how to configure a 3Com 4210 ? I think I have managed to do a factory reset (Control-B at console prompt on boot and choosing to ignore startup file). The switch does not get an IP ...
0
votes
1answer
25 views
Command to check server port number opened or not from hp switches
I am facing is that to check the port number of the server is opened or not. DOnt know how to check it and also gone via various hp pdf's with no go. Like in cisco if we want to check whether the ...
0
votes
0answers
54 views
Windows 7 can no longer access domain, stuck on one local account
thanks in advance for your time.
I have a laptop on my domain that was recently re-imaged after having the same issue describe below, everything worked perfectly on it, could log on to my domain ...
-1
votes
1answer
89 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 ...
0
votes
1answer
78 views
Single switch to connect internal and external NICs?
We have bunch of servers with two NICs, one is configured with internal IP and one with external IPs. Planning to use a single switch to connect them all together.
Here is the current setup:
...
0
votes
2answers
63 views
Nagios and Switches NOOB
I need some help, I want to monitor the DGS-1024D which is a business grade d-link switch.
I have no current way of knowing if any of these have IP addresses on the switch or if there is away to ...
1
vote
2answers
98 views
Need help setting up an HP Procurve 2650 switch via serial using Linux.
I recently bought an HP Procurve 2650 (J4899A) off ebay and it came out without a serial cable. So I also purchased a null modem serial cable (rs232) to connect to it (Assuming this is the right one). ...
0
votes
1answer
36 views
cisco small business 300-10 managed config import fails
Device: cisco small business 300-10 10-Port Gigabit Managed Switch
Firmware: 1.2.7.76
The config installation via webinterface with TFTP or http fails with following message in the console ...
1
vote
1answer
85 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
4answers
149 views
new Catalyst 2950 switch, no console or telnet CLI access
I am connecting a brand-new Catalyst 2950 switch to my LAN. It is on with green lights, and frames successfully go in and out the ports. The switch is on the same LAN has my host PC, and pings are ...
0
votes
0answers
46 views
Stackable switches [closed]
We are looking for switch with minimum 32 SFP+ port, and also we need a separated stacking module. We don't want to use QSFP+ or SFP+ for stacking.
Today we found just 2 manufacturers, Juniper and ...
0
votes
1answer
53 views
Firewall connected to a switch using 2 ports (LAN & DMZ), but switch management talks on DMZ port
Someone let me know if I'm off track here.
I'm setting up a firewall with 3 ports configured (WAN, LAN, and DMZ). The LAN and DMZ ports both connect to the same switch, on which I will configure a ...
2
votes
1answer
67 views
Catalyst to Nexus Migration - Can 4948s be used for access switches
We currently have a switching topology in which two 7600 make up the core and there are N many access layer 4948s at the top of every few racks. They are trunked to both 7600s. I would like to ...
-1
votes
1answer
33 views
Connect to a higher level gateway? [closed]
Currently the network in our building is setting up as:
PPPoE Router (192.168.1.1) -> A private DHCP/Router (10.0.0.1) -> My computer
Are there anyway posible that My Computer can access the higher ...
0
votes
0answers
65 views
Why IPTV Headend always connected to Router instead of Switch
in all IPTV infrastructure diagrams, I always see the IPTV headend connected to Router even if the IPTV stream only needed in LAN environment. no one explain why they do that. I am asking because we ...
1
vote
1answer
66 views
Firewall: Can I use WAN load balancing to emulate link aggregation?
I have a Sonicwall NSA 3500 I'm configuring. It supports 1.5 Gbit of state-full traffic, but a single WAN port only supports 1 Gbit of traffic.
The NSA series firewalls don't support link ...
0
votes
1answer
41 views
Samba server connected to WLAN router cannot access Windows machines connected to netgear hub
I have a samba linux server connected to the WLAN router. Also connected to the WLAN router is a netgear hub/switch that is itself connected to the office windows workstations. The problem is that the ...
2
votes
2answers
201 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
2answers
91 views
Redundancy scenarios for a small network centered around a Cisco 3560X switch
As the title says, I manage a small network which uses a Cisco 3560X as the core switch. We have recently got a 2nd identical switch and I have started thinking about how to add some redundancy to the ...
