a device that bridges network segments, operating at the OSI link layer level.
2
votes
1answer
66 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 ...
2
votes
1answer
297 views
Configuring https access on HP A5120 Switch
I am trying to configure HTTPS management on a HP a5120 switch running Version 5.20.99, Release 2215 and not having much luck. I have followed the manual by creating an SSL policy first and then ...
2
votes
1answer
1k views
Configuring Sonicwall to route VLAN traffic to internet
I have a Sonicwall NSA 2400 that had its configuration reset and I'm having trouble reconfiguring it.
The Sonicwall's WAN port (X1) connects to the internet. Its LAN port (X0) connects to a 3Com ...
2
votes
1answer
221 views
iSCSI aggregation using one switch
Thinking of doing 2Gb aggregated iSCSI between a VM Host and a multi controller iSCSI array. Multipath with two switches is normal for this, but I only have one switch at the moment. But the switch is ...
1
vote
1answer
44 views
Setting up untagged VLAN on GE-24F4GBW
I got this old boy of a switch, which has been set up with some vlans.
Everything works great when using tagged VLAN id's, and when using VLAN1 (default).
However, I cannot set the PVID of a port to ...
1
vote
1answer
132 views
Cisco SLM248G Switch Hardware Reset
We have two Cisco SLM248G switches within our environment. After some research, it seems that one is causing a few problems because during heavy loads, it is sending transmissions to our firewall ...
1
vote
1answer
129 views
Inconsistent local network behaviour
I'm in an institution with a local area network with multiple labs, all of which access the net through a common proxy, set up in the client browser/app manually, now in one of the labs, the following ...
1
vote
1answer
167 views
Zeroshell ping time out & sometimes undetectable
I'm a newbie system administrator.
I am currently managing the internet connection for a college and have decided to use zeroshell.
My problem is that when I plug the zeroshell box into the ...
1
vote
1answer
352 views
dell power connect 3524 switch SNMP port mapping
I am using MibViewer utility and executing SNMP Walk command using OID .1.3.6.1.2.1.17.7.1.2.2.1.2 to find which MAC addresses are connected to which ports on my switch.
What I am seeing is that for ...
1
vote
1answer
573 views
Using Plink to script commands to Dell PowerConnect 6224
I'm trying to setup a simple script to update the configuration on a Dell PowerConnect 6224. I have SSH setup and working and can connect to the switch using either Putty or PLink but when I use ...
0
votes
1answer
73 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
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
54 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 ...
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
1answer
51 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 ...
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 ...
0
votes
1answer
81 views
Small Business Server Standard 2011 Acting As A Router/Firewall or Connected Via Switch
Using Small Business Server Standard 2011, what is the preferred best practice for a group of about 15 computers.
To use it as the router/firewall and have it be assigning DHCP, or have it connected ...
0
votes
1answer
729 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 ...
0
votes
1answer
61 views
USB access from switch
Currently, I have a network setup that kind of duct-taped together. I have
A.) The wireless DSL modem with four ethernet ports and a USB 2.0 port
B.) The wireless router with four ethernet ports and ...
2
votes
0answers
151 views
Basic QoS policy for Dell 6248 switches
My cisco edge router tags all incoming packets as IP precedence 0, 3, and 5 depending on their priority. How can I add a matching QoS configuration on the switch so that packets are prioritized ...
2
votes
0answers
202 views
Q-BRIDGE-MIB representation of ports on Dell PowerConnect 6248
I have a Dell PowerEdge 6248 with a 2x10Gb uplink module. I'm trying to make sense of the representation of the ports from the following snmp output:
Q-BRIDGE-MIB::dot1qVlanStaticUntaggedPorts.4081 = ...
2
votes
0answers
330 views
Port mirroring on Cisco switches
I have a Cisco Catalyst 3750X switch, and I have configured port mirroring on it. Traffic from 12 of the 1G ports will be mirrored to both 10G ports, and I have connected both 10G ports to a server ...
1
vote
0answers
85 views
Issues connecting to HP ProCurve switches
We are having a very strange issue trying to connect to our infrastructure switches via SSH. When you first try connecting to them, the switches will prompt for the password - and then just sit there ...
1
vote
0answers
46 views
Is the Foundry BR-FGS624P switch stackable by adding the 10GbE ports, or is it never stackable?
I'm looking at buying a Foundary BR-FGS624P 24 port switch which will suit our purposes now, but thinking into the future I might like to stack the switch when we add a few more servers to our rack.
...
1
vote
0answers
123 views
TP-LINK to HP switch connectivity issue
I have purchased 2 TP-LINK SG3424P switches to power PoE access points. Half of them are connected to one TP-LINK switch that is then connected through a trunk port to a Cisco 3560X and the other half ...
1
vote
0answers
84 views
stop arp poisoning on a 5448 powerconnect switch
We have to disable arp poisoning on our dell 5448 switch. Right now it has all our production machines running on it and I'm not a networking guy at all so I don't want to run a command that will ...
1
vote
0answers
377 views
Is it possible to mix jumbo frames VLAN and standard mtu VLAN on the same switch port?
If a managed switch and all attached devices both support VLANs and Jumbo Frames, is it possible to mix VLANs with jumbo frames and VLANs with standard frames on the same switch port / ethernet card?
...
1
vote
0answers
77 views
How can I use multiple NICs on Windows Server 2008 function as a switch
I have a win2008 Server with 4 network ports (A,B,C and D) where only 1 port A is connected to the LAN (192.168.0.0/24). The other 3 ports (B,C and D) are not in use.
I have another PC want to join ...
1
vote
0answers
232 views
Configure vlan on Netgear switch via SNMP
I am trying to configure vlans on a netgear GS752TSX from the Linux command line with netsnmp. I have created vlan 99 on the web interface now want to control the pvid settings, egress and tagging. I ...
1
vote
0answers
306 views
HP E3800 switch to switch LACP connection dropping
I have a problem with 2 sets of stacked (2 switches in each stack) HP E3800 48 port switches. One set of stacked switches per rack for a total of 4 switches. I have a 4 port static LACP connection ...
1
vote
0answers
381 views
Ping starts, then immediately fails, to just one device on a network of 70+ and only from one part of the network! Super confusing
long-time reader first-time poster.
I managed a network of 70 odd PCs connected to 3x different network switches (3 buildings all next door to each other).
Looks like this:
BUILDING 1 SWITCH -> ...
1
vote
0answers
138 views
Cisco 2950 Express Setup
I've been donated a Cisco Catalyst 2950 Switch by the company I work for to have a play with.
I've reset it back to Factory Defaults, but having an issue with getting to Express Setup.
I've followed ...
1
vote
0answers
162 views
Dell PowerConnect 5448 QoS policy based on TCP port specification?
I am working with a set of Dell PowerConnect 5448 switches where I'm trying to prioritize traffic for specific TCP ports/services. In this case, it's a production warehouse printing environment, and ...
1
vote
0answers
91 views
Duplicate packets on network after disconnecting wireless access point on separate VLAN
We have a network with a few switches. One of these is a 3com 4500, where there are many computers connected, a custom linux firewall and a wireless bridge. The port where the wireless bridge and the ...
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 ...
0
votes
0answers
11 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
0answers
30 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
0answers
49 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
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 ...
0
votes
0answers
62 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 ...
0
votes
0answers
40 views
I have a firewall that supports 1Gbit ethernet ports but 1.4Gbit of traffic, can I make use of a 10Gbit pipe from the router in this case?
We're putting up a rack of servers in a datacenter which provides us either a 1Gbit pipe or 10Gbit pipe from the router (our choice, our package includes 10Gbit).
But if we have a firewall which ...
0
votes
0answers
49 views
Routing traffic externally instead of internal loop
I have one Ubuntu box with 2 network cards.
I am running netperf on the computer to measure performance of networking equipment, ethernet coming out of eth0 into the switch then back out into the ...
0
votes
0answers
89 views
IBM Bladecenter Nortel switch issue
We have a IBM Bladecenter with integrated Nortel switch.
The problem is I am not able to change anything on the switch because I am getting the following errors:
>> azimov-in - Main# diff
Diff ...
0
votes
0answers
61 views
remote port span lose network connection
Over the weekend I enabled port spanning on the switches. I have included some screen shots of the monitor configuration on the switches. However there are two things I noticed. One the destination ...
0
votes
0answers
66 views
d-link switch cli change vlan id
I need to change the VID of a vlan on a DES-6500 switch.
Removing the vlan and then creating it again with the new VID is not an option for me.
Is it possible to do this?
0
votes
0answers
278 views
Poor HP Procurve 2848 port performance
I have a 4 servers connected to a HP 2848 switch with uplink to a router (Linux or Cisco - doesn't matter). Total traffic is about 300Mbps with 60-70Kpps.
The problem is with a a port, connected to a ...
0
votes
0answers
83 views
SCOM2012 monitor detail changes on switch
Could I use SCOM2012 monitor the changes on switch(CISCO 3750 2960 4906 etc), such as VLAN changes, Port shutdown, open any services on switch.
I noticed there is one reports named configuration ...
0
votes
0answers
168 views
Is my 2 x Procurve and Draytek router VLAN setup going to work?
I'm the designated system admin at my office and have the task of splitting up our building network between two companies that should not be able to see each other whilst both retaining Internet ...
0
votes
0answers
302 views
Hp Procurve Switch : port filtered
My HP Procurve switch is blocking port 22 and I dont know how to unblock it.Please let me know
From the server, see port 22 is blocked
[root@server ~]#nmap -p22,80,443 10.247.172.70
Starting Nmap ...
0
votes
0answers
41 views
File transfer - Bandwidth dropping down, following a pattern
This is what I get from the destination server while transferring a huge file to it over the LAN.
The screenshot has been taken during the file transfer, I did not paused anything, the transfer was ...
