Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.

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5
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2answers
421 views

Embedded device configured with bad IP address, can I still connect?

We have an embedded device running Linux (2.6.?) that can no longer be accessed over Ethernet. Someone in the field gave this device the following bad settings to its ethernet interface: IP: ...
1
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2answers
1k views

Debugging perceived network saturation

I'm having a network issue where one machine is saying it is sending data at a rate of 150 Mbit/s but the other machine is receiving at a mere 100 Mbit/s. The sending application eventually crashes, ...
7
votes
2answers
3k views

VLAN for WiFi traffic separation (new to VLANing)

I run a school network with switches in different departments. All is routed through to a central switch to access the servers. I would like to install WiFi access points in the different departments ...
1
vote
1answer
228 views

Can't telnet from windows machine to OS X laptop on same network?

I'm trying to telnet from my windows box into a service running on a known-available port on a mac laptop, but the connection is getting refused. I can telnet into the service locally. Firewalls are ...
0
votes
3answers
611 views

How to restore after sudo killall sshd?

I have a Linode virtual server that I made go down yesterday. Basically, I killed sshd using killall sshd First time I issued this command, I forgot sudo so it just dropped my connection. Next ...
2
votes
1answer
194 views

I changed the duplex settings on my network card and lost vSphere connection, but through the KVM console I cannot find a way to switch it back

It lets me view the details for the network adapters, but I cannot find any way to turn it back to Auto Negotiate. I changed it to 1000 MB in an attempt to troubleshoot something, but as soon as I hit ...
2
votes
3answers
2k views

Can a broadcast storm develop in a loop caused by a wifi connection?

If my laptop or other computer is tied to a wired network, and it automatically joins a wifi router attached to that same network, can the two connections to the network cause a loop that starts a ...
9
votes
1answer
1k views

Limit ICMP Per Source IP with IPTables

I have mistakenly thought that the limit module is per source ip, but it appears to be based on all requests: 577 36987 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0 ...
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votes
2answers
1k views

web page slow load due to long DNS lookup

My website currently is running slow when doing certain AJAX calls. If I do the ajax action consecutively in a row, it is fine. But if I pause for a few minutes and then fire off the ajax event, the ...
1
vote
1answer
1k views

iptables with vlans and duplicate IPs

I'm setting up a test lab situation where multiple computers will have the same IP addresses, so they need vlan separation. For example, a group of virtual machines will have IPs 192.168.1.200, ...
1
vote
1answer
851 views

Netatalk and Snow Leopard Slow transfer speed

I have a simple setup of netatalk afp server on my OpenSolaris box. And I also have samba on that box. transfers from netatalk to my mac mini with Snow Leopard 10.6.8 go at speed 2-3 Mbytes/sec but ...
2
votes
2answers
1k views

SSH disconnection issue - TCP RST packets

I have a SSH disconnection problem, disconnection occurs randomly. Sometimes, it works fine and other times I am frequently disconnected. After the disconnection I can again re-connect and continue to ...
0
votes
1answer
67 views

isl vs clustering

What is the different between clustering and ISL for a cisco switch? I mean what is the cluster function of Cisco? Only for management? That means two switch in one cluster is still two switch? What ...
2
votes
3answers
970 views

Openvpn not routing to the internet over a tun interface

I've set up openvpn using tun. I can ping both ways between client & server. But I can't ping from the client to 8.8.4.4 (as a test). I've added nat with: iptables -t nat -A POSTROUTING -o eth0 ...
0
votes
4answers
1k views

Unable to receive UDP packets from a link-local address [closed]

I have a program which attempts to contact to an embedded device over UDP. The embedded device has a link-local address only (169.254..); the Linux host has a normal (DHCP, RFC1918) address, managed ...
1
vote
1answer
324 views

HP Network Device Management Software

I look after a network with 11 x new HP v1910 24-port 1GB switches and 2 x HP 4204vl 1GB Chassis switches. I'm looking for software to enable me to: Map the network graphically - there are a lot of ...
2
votes
2answers
3k views

Multiple External IP Ranges on a Juniper SSG5

I have a Juniper SSG 5 firewall in a datacenter. The first interface (eth0/0) has been assigned a static IP address and has three other addresses configured for VIP Nat. I have a static route ...
2
votes
1answer
244 views

complicated bonding and network question

I am not a network guy and would like to know how can I setup the below two configurations and their pros and cons: Networking component: -- WAN: Cisco 2970 * 1 Load Balancer: F5 switch 1600 * 2 ...
1
vote
1answer
244 views

Multiple IPs on single interface - force source IP address

I have an interface eth1 on host A with two different IP addresses (let's say 10.0.0.1 and 10.0.0.3). The .1 is the standard IP of the host and .3 is the failover IP that can be switched over to ...
0
votes
1answer
347 views

Transmit Data over wlan in Linux

Its a repost from here : StackOverflow, I am struggling to find a some tool through which I can transmit the Data through a Wireless Driver which gives me the flexibility to set for instance the ...
3
votes
1answer
112 views

Print list of used IP addresses?

I am running a small network with a subnet of 255.255.255.0. I would like to run a command in either Windows command prompt or OS X Terminal that would output a list of used IP addresses. The list ...
4
votes
4answers
856 views

Resolving IP address conflicts on a LAN

We have our LAN set up with DHCPD providing fixed IP addresses to the systems. However we are facing IP address conflicts if some one connects a laptop and assigns an IP address belonging to another ...
3
votes
1answer
3k views

Output Drops on Cisco Switch — Counter?

I was always under the impression that the Total output drops was a counter that goes up until it resets (or maybe wraps around 4 billion). However, this seems to indicate otherwise, or something is ...
0
votes
1answer
149 views

New 5424 Power connect gigabit managed switch problems

I just purchased 3 new managed Dell 5424 power connect gigabit switches to replace my 3 older Dell 10/100 unmanaged switches. Everything was running fine on the older switches except we now have about ...
1
vote
4answers
677 views

How to setup a small office network with a VPN client and a shared Internet gateway

I manage a small-office network but have very little actual networking knowledge / understanding. The network has a consumer grade wifi router (Netgear DG834G), several PCs/Macs, some iPads connected ...
0
votes
2answers
194 views

LAN Traffic Monitoring Tool [closed]

I am searching for a windows desktop application which will monitor the LAN traffic (promiscuous mode -- PORTS and Destination IPs) and show me stats, graphs etc I need to know if anyone PC is ...
1
vote
2answers
290 views

Load balancing or high availability tomcat with network switch?

i was wondering if it is possible to load balance and create a high availability environment using network switches? Or do i need a real apache server in front of the tomcat servers?
6
votes
5answers
1k views

Keystone vs. Feed-Thru vs. Punchdown Patch Panels

We have a new office that needs some ethernet wiring done to a cabinet in a closet (no more than 48 cables). There seems to be so many options now. I'd traditionally terminate everything at a ...
0
votes
2answers
320 views

What is the impact of intermittent traceroute timeouts

There are intermittent timeouts upon doing traceroute to an IP address. What impact does it have on say when you are trying to connect to a DB from an App server? traceroute to ...
0
votes
1answer
3k views

Add Persistent Static Route in Centos 5

What is the proper way to add a static route in Centos 5 that will persist rebooting? I tired adding an route-eth0 file in /etc/sysconfig/network-scripts that contains a route , but after ...
3
votes
2answers
1k views

NIC bonding can't go above 1 Gbps

I have 4-ports Intel 82571EB Gigabit adapter. It uses e1000e driver. The test machine is running Ubuntu 9.10, clients 9.10/10.04. I tried link aggregation (mode 4) and adaptive load balancing (mode ...
0
votes
1answer
220 views

Setting metrics in ubuntu for eth0 and wlan2

I have two scripts, one copying files from machines on closed network (no internet) to the hard drive of the laptop and the other script trying send these files to over the internet using the wlan. ...
1
vote
1answer
84 views

Windows Domain Controller and XP Workstation

This is probably the simplest question ever, but as usual typing a question on SF clears things up in my mind. I am setting up a DC using Windows Server 2008 R2 (after a hard drive failure) and have ...
0
votes
1answer
288 views

Load balancing on outgoing direction on Centos server with multiple NICs

In my lab environment, I am doing a stress testing for a application running on 3 Centos 5.4 servers.All of the work of the application is recevie the data from network and make two copy on any other ...
3
votes
3answers
185 views

Finding IP of Network Switch

I bought a used Dell PowerConnect 3324 network switch and am trying to connect to it so I can configure it. I have been using as is for a long while not and it works fine but now it the time to get ...
3
votes
2answers
619 views

Fighting Off Network Flooding

my website sometimes gets attacked by people. You can see such an attack at 18:00 and later on a bigger attack at 22:30. Basicly the servers network card gets flooded by incoming requests. My ...
1
vote
1answer
100 views

Routing based on the source ip

I'm trying to configure a host in a way that the traffic is routed either via eth0 or vlan123@eth0, depending on the source address used. Both interfaces have access to the whole network and both have ...
1
vote
2answers
542 views

Is subnetting worthwhile\possible to seperate out VOIP in my situation?

I'm ballparking the numbers here, but I have 50+ machines and around 30 hard VoIP devices. Unfortunately, 10 or so PCs use the 100Mb pass-through port from the VoIP phones and 2 PCs use softphones ...
1
vote
1answer
1k views

Linux Route All Internet Traffic through secondary interface

Given the following output from ifconfig, I would like all outgoing traffic to come from bond1:1 instead of the default bond1 interface, how would I go about accomplishing this? bond1 Link ...
2
votes
2answers
400 views

High availability with two ISP

I am trying to come up with design for my network. Need your suggestions: Two options: N1: Two OpenBSD boxes, each connected to ISP, BGP configured with providers only. Both boxes connected to LAN, ...
0
votes
1answer
69 views

Weird cisco router activity

We have a Cisco 1811 router with one external ip. attached to that router is a Cisco wireless access point. We have a windows 2008 server attached to a switch port on the router. No this is where it ...
1
vote
1answer
349 views

Valid MAC-Address with a zero-byte at last position?

is it possible that a valid MAC-Address has a empty (zero) byte at the last possition? For Example: Byte 1 = 00 Byte 2 = 26 Byte 3 = B9 Byte 4 = 13 Byte 5 = 7B Byte 6 = 00
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votes
1answer
46 views

What shows up on network printer log [closed]

I sent a document to our HP network printer at work. I just typed a doc in word, printed it, and deleted it. Can it be recreated? What shows up on the log? The actual doc or just the time, number of ...
3
votes
1answer
1k views

Dell 62xx (6224) QinQ configuration (Double-Vlan)

I have a few Dell 6224 and a bunch of 3524's and some 5324 - with the latest firmware. I need to configure QinQ between ports, conveniently called "Customer port" on the 35xx and the 53xx, and it ...
1
vote
1answer
110 views

Strange server connection issue between two networks

I have two sites connected with 2 encryption devices on either side. Each site has a single flat switch connected to the encrption device on each side. Site A has servers. Site B has workstations. ...
0
votes
1answer
65 views

Servers cannot see internet gateway though their configuration is the same to another which can

I have 2 switches at the Data Centre - one is connected to the internet, and one for the internal private network. All servers have one NIC into the internet switch and one to the private one. All ...
1
vote
1answer
364 views

Accessing the QSYSOPR message from the DB2 iSeries console when it is locked

For a variety of reasons yesterday we had to shut off access to the router that our iSeries connects to, we did this in an attempt to prevent a full shut down of the iSeries. Today when we ...
0
votes
1answer
682 views

Ipconfig and Network Connection status shows different things on Windows 2008 R2

I've this weird situation where ipconfig /all shows all dns-es for LAN connection correctly, however when I go to network properties of this LAN connection and check status it only shows 2 ip address ...
1
vote
1answer
161 views

Windows Share Unavailable when Accessing from Wifi

We are running a small LAN in our Company using a Cisco Router. Attached to this Router is QNAP NAS providing Access to Data via Windows Shares (we all use Windows 7 Computers). As the Router does not ...
1
vote
2answers
699 views

Can I divide a /28 network into two /29 networks?

I have a 192.168.1.64 /28 Network Can I divde this network into 192.168.1.64/29 and 192.168.1.72/29 ? My Question is related to the fact that now the "network address" (192.168.1.64) of ...