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

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Why do I see so many ssh packets in only a couple seconds?

I am learning how to use tshark so I can better understand networking. As a user the protocol I most often use day to day is SSH. So I thought I'd start a capture filter on ssh packets on my server ...
3
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2answers
213 views

tcpdump truncates to 1472 bytes useful data in UDP packets during the capture

I am writing an application which work with network. To perform some tests I need to reproduce the flow which I had a day before. But at the same time it is not allowed to stop the current working ...
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2answers
90 views

Multilayer LACP

I have a network switch that is limited to 2x1Gb/s LACP teaming, however have a file server with a 4x1Gb/s network interface. What options do I have to aggregate all available bandwidth without ...
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0answers
20 views

shrew soft vpn client routing to another network

I have configured Shrew soft VPN Client on Kubuntu 12.04.3 and is connecting to CISCO RV042. The CISCO router is connected to LAN 10.66.11.0/255.255.255.0 and also connects to another CISCO router at ...
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1answer
32 views

Setup network between 2 computers connected using wifi [closed]

In my office I have a WiFi Router that allows 2 computers to connect to Internet. I have 2 questions - How can I create a network between these 2 computers for file sharing? Can I access SQL server ...
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3answers
133 views

Can't access Exchange OWA from Wireless Subnet - Firewall rule?

The Problem The issue is that I can't access port 80 (or 443) on the Exchange server, unless I add a blanket rule to allow all traffic from the client to the server's subnet. If I add a rule to ...
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2answers
67 views

Why would a public subnet be used here? [closed]

I'm a former DBA/Developer who now handles all IT aspects in a new role, more by chance than design - you know, "he used to be in IT so obviously he can handle everything" type of thing. I've set up ...
0
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1answer
57 views

KVM Isolated network between host and guest fails after few hours

I have a KVM CentOS host with several CentOS guests. All of the guests are using a bridge for network communication. The guests have been up and operational for several months and work properly. The ...
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0answers
30 views

<SOLVED>IIS7 HTTP Redirect not working correctly for my use

quick overview of our network. One WAN IP, two win 2k8 web servers. Initially one was for our public sites, the other was for our internal sites. Using a router as a firewall / NAT device. We now ...
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0answers
81 views

Connect Multiple Users Behind same NAT l2tp/IPsec

I have installed OpenSwan on CentOS 6, the clients connection to the server is successful and when i direct my browser to http://whatismyipaddress.com on the client it shows the public ip of the ...
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0answers
95 views

pfsense access openvpn client´s lan

I want to cover the following case: pfsense server´s LAN: 10.1.0.0/24 openvpn client network: 10.2.0.0/24 Local network of one openvpn client: 192.168.2.0/24 Working: Access the network ...
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81 views

Forwarding traffic from one ethernet interface to another

Earlier, I was trying to get traffic from one ethernet interface to another without using a bridge. Here is a link to the solution : ...
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0answers
30 views

Azure VM belonging to multiple cloud services

I am brand new to Azure and still trying to figure everything out so please excuse my ignorance. I'm trying to take one VM running IIS and to host multiple websites on it, each with a different SSL ...
0
votes
0answers
12 views

issue with QSFP+ to 4x SFP+ cable

I have a Gigabyte MD60-SC0 motherboard which has a QSFP+ port. I need to connect this with another machine I have which has a Intel X520-SR2 NIC (with two SFP+ ports) plugged in. I also have QSFP+ to ...
0
votes
1answer
95 views

VMs on ESXi system, only able to use internal IPs

first off I am a bit of a network newb, I know the basics but that is about it. So I have a ESXi server running a few VMs. The set up is; -Master IP (controls the ESXi box) -Internet IP (for general ...
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1answer
41 views

Server 2012 Can't Ping Local Network

I have four Windows Server 2012 servers hosted on ESXi 5.5. The first one is the firewall box with two network adapters. One with an external connection to the internet, that is shares its connection ...
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2answers
75 views

How does Linux pick which network interface to use?

Let's say I have a machine with two network adapters on different subnets, eth0 (10.0.100.5) and eth1 (10.0.200.5). Assuming both subnets have routes to the internet (though their own NATs) and to the ...
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0answers
76 views

Unable to ping or access local device

I have a very strange problem where I can't ping a router acting as client from one pc but at the same thing I can from another pc which are both connected to the same router. I have Router-1 ...
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0answers
41 views

Check concurrent connections per user on OpenVPN server

I have an OpenVPN server running on a dedicated server and I want to know how many connections each user has open with the server. To test, I made it so im the only one that can login, and then ...
0
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0answers
28 views

Elastic IP Not Resolving to Windows Instance

I'm sure I'm just missing a step, but I can't figure out how to get server to resolve to new elastic IP address. I appreciate everyone for their help. I've been trying to figure this out for a while ...
2
votes
0answers
53 views

How to route traffic through different interfaces based on the port number?

iptables -A PREROUTING -i usb0 -t mangle -p tcp --dport 8080 -j MARK --set-mark 1 iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain ...
2
votes
2answers
106 views

Intermittent host and VM connectivity on ESXi standalone

I have a standalone ESXi 5.5.0 b2143827. It is running on a Dell R710 with 144GB of RAM. It has approximately 20 VM's on it. Right now, I cannot get onto the console via the VMWare vSphere client or ...
0
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0answers
60 views

Can't reach shared folder from VM over VPN

My network knowledge is a bit lacking so I'm looking for some help on why we can't access a shared folder. We have a Windows 8 VM on a Mac host that is sharing a folder that we want accessible from ...
1
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4answers
207 views

Is there a netstat -s equivalent for windows?

I know that netstat -s exists on Windows, but it displays way less informations than on Linux/OS X. It only gives 8 counters about TCP, while on Linux it's more than 50. I'm looking for any ...
2
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1answer
68 views

DHCP reservations for a range of MAC addresses

Question Our DHCP server is set up to only give IP addresses to machines that it knows about (all IPs excluded, reservations for each MAC address). Part of the address range is used for virtual ...
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3answers
62 views

Branch office Connectivity issues

We have two offices. One in The Netherlands and one in India. In each office we have pretty good internet connection (~20Mbps). The major problem we face is cross office connectivity. Skype calls ...
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1answer
28 views

Why does ssh -f create multiple processes when a pipe is used? [closed]

When I on my Linux host do ssh -f 10.10.47.47 "/opt/omni/bin/mbuffer -4 -v 0 -q -I 8024 | /usr/sbin/zfs receive tank/test" then I see on the remote host 27349 ? S 0:00 bash -c ...
2
votes
1answer
84 views

Cisco Catalyst 3750 disable Factory default reset with Button press

The Catalyst 3750 Series switch has a front panel button which erases the config and reboots the switch if pressed more than 10 seconds. In a dense Rack it happened more than once to me that cables ...
1
vote
2answers
137 views

Centos 7 with 2 network interfaces on same network one of them doesn't respond to ping from outside

I have a centos7 just installed with 2 active interfaces on the same network like this ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback ...
1
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0answers
19 views

VM LAB - Promiscuous mode clarification

So for clarification I am running a Lab within VMware behind OpenVPN, 1 NIC with direct internet access (WAN vswitch) and another NIC with a leg inside a LAN vswitch. (This obviously houses my VM's ...
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2answers
62 views

Routing between 2 networks and 2 routers

I have a WatchGuard XTM33 and a Cisco ASA 5505, current network is running off of the Cisco and I want to eventually migrate over to the WatchGuard using new IP scheme. ASA 192.168.111.1/24 WG ...
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0answers
40 views

301 redirect DNS issues

I think I screwed up something in my DNS configuration and now its bugging me for hours. Any help would be greatly appreciated. I own a domain lets call it abc.com Before all the issues happened ...
0
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1answer
38 views

Can a faulty switch connected to the core switch block an entire network?

I encountered the following situation: The network I administer was blocked, and this was traced down to a specific rack, after I reseted both switches, everything worked. I supposed it was the core ...
0
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1answer
38 views

replace web traffic content with squid

I am using squid to block certain types of traffic to reduce band width, I have so far blocked adds, flash applications, video streaming and other such things. when a website or an advertisement ...
0
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2answers
485 views

OpenVPN Route Client Traffic Through VPN Server Tunnel

I have configured a vps following this tutorial, the server and client are successfully connected and can ping each other, server is at 10.8.0.1 and the connected client (android-OpenVPN Connect) get ...
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votes
1answer
111 views

With two NIC cards, in Linux (Debian), how do I keep the NICs from getting the same ip address? [closed]

I am using Debian 7 (wheezy). I have two physical NICs. I have used ifconfig and gnome-nettool to try and solve this. When I look at the device tool I see eth0 and eth1 (and the loopback). eth0 ...
0
votes
2answers
63 views

Interconnecting a fiber optic switch with a copper switch

What would be the best way to connect from a "fiber optic only" switch to a regular copper rj45 switch? Which of the configurations shown in the attached diagram would work properly? Should I go for a ...
0
votes
1answer
87 views

Archive & analyse network logs from NetBSD on another machine

I want to use the the new NetBSD's NPF firewall on a gateway that also has the legal obligation to log the traffic for 1 year. To offload the gateway, I though to put the logging stuff (and IDS, quota ...
0
votes
1answer
76 views

Linux ping network namespace

I added namespace to my host-machine and made it available by using this: ip netns add h1 ip link add veth01 type veth peer name veth1 ip link set dev veth1 netns h1 ifconfig veth01 10.0.0.1/24 up ip ...
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0answers
36 views

Network connection from old application to SQL Server 2008 R2 lost once in a while

We are trying to migrate an Axapta 2.5 database from SQL Server 2000 to 2008 R2. We are testing performance etc. on the new server, but once in a while, these two events are thrown on the Axapta ...
0
votes
2answers
66 views

Name Server with Multiple IPs

We have multiple internet connections attached to my company's network, from different providers, and there are authoritative name servers on the network as well, also with an IP from each of those ...
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votes
1answer
31 views

Users unable to log on to network

A strange problem came up over the last few days. Some of our users had an issue logging on to the domain network. I had thought perhaps it had something to do with a command that was run using a ...
0
votes
2answers
57 views

Would UDP over VPN eliminate packet loss?

I am receiving a MPTS UDP stream from a remote location and I am experiencing packet loss. I would like to know if there's any way to eliminate this packet loss while still using the UDP protocol? I ...
1
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2answers
22 views

How can I redirect requests for a site in IIS to a different external server?

I am about to move my website away from IIS to a Linux VPS. Part of this involves updating zone records. There will be some time from when I change my zone records to when they are propagated to ...
0
votes
1answer
294 views

Adding static IPs on a p1p1 interface in ubuntu 14.04

I'm wondering if anyone can give me a rundown for networking configurations in ubuntu when the interfaces are p1p1 etc. I have tried p1p1:0 (like eth0:0) for secondary IPs to no avail. If someone ...
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1answer
50 views

Where to optain my client key for SSL decryption? [closed]

example.pcap is a traffic capture I have made on my local Linux box of and now I would like to decrypt it. tshark -o "ssl.desegment_ssl_records: TRUE" -o "ssl.desegment_ssl_application_data: ...
2
votes
2answers
1k views

Docker containers can't resolve DNS on Ubuntu 14.04 Desktop Host

I'm running into a problem with my Docker containers on Ubuntu 14.04 LTS. Docker worked fine for two days, and then suddenly I lost all network connectivity inside my containers. The error output ...
1
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2answers
101 views

/etc/sysconfig/network is ignored on CENTOS7

I have a server with two NIC's. The default gateway has to be on a specific one, therefore I configured the GW via /etc/sysconfig/network. But obviousely, this is completely ignored by the ...
0
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0answers
38 views

packet is not being forwarded from tap interface to bridge

I am running fedora 19 on a virtual machine and have two tap interfaces (A, B) created. I'd like to be able to send packet from A to B. I am trying to do this using a bridge, however with the bridge ...
0
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0answers
15 views

Persistent promiscuous bridge interface

In an effort to try and clean up the office network I've mirrored the uplink port on our switch, plugged it into a spare port on our VM server, and set up an VM with ntop. All this works, however we ...