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

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6
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119 views

Configure Juniper M320 as Ethernet/STM transparent converter

There is Juniper M320. We need to move ALL the traffic from one port to another. Everything that comes to one port goes to another and vice versa. No snooping or any other processing is required. One ...
5
votes
0answers
50 views

How to make a disconnected drive?

kind of a weird question but how do I make a drive go from a OK state to disconnected state using net use? I do not want to delete it. I am testing a script but the annoying thing is that to test the ...
5
votes
0answers
878 views

Troubleshooting Redmine performance

I've got a Redmine instance (Bitnami Stack) that's unusually slow. Because I'm just trying to get to the bottom of this, I have some theories which I'd like to discuss here. So, if anybody has any ...
4
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0answers
55 views

How can I provide services to an internal air-gapped extranet

Background - "Extranet" We have about a dozen users that are on what I would call an Extranet. It is an air-gapped LAN that is physically in the same location as our primary LAN. We share the ...
4
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0answers
52 views

Breakdown Windows Network IO by network adapter and by process

What I'm trying to do is breakdown the Network IO by network adapter and by Process. The goal is to identify which processes are generating the most IO on a certain network adapter. Resource Monitor ...
4
votes
0answers
229 views

some IPs within a subnet not reachable

I'm running 3 Debian-Servers, each with its own IPMI. All IPs are within the same subnet with the same gateway. The problem is, that each server can ping its own IPMI but not the IPMI of the other 2 ...
4
votes
0answers
220 views

IPSec bandwidth between two Pfsense hosts has predictable, variable bandwidth

I have a IPSec tunnel between two Pfsense machines. Both machines are connected to a 100mbps symmetrical connection. The latency between the two routers is ~70ms. I'm using AES-GCM-128 and SHA1, both ...
4
votes
0answers
580 views

TCP connection stuck in SYN_RECV state despite ACK received

My client and server are both internal machines. tcpdump on both client and server show all three parts of handshake are communicated, however netstat on server shows SYN_RECV, and on client shows ...
4
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0answers
129 views

Configuring Container with bridges and vlans (server only?)

I have two groups of lxc contianers on a server and want to isolate their network traffic for security reasons. I will be using port forwarding so the containers much each have separate IP's. I know I ...
4
votes
0answers
433 views

snmp MIB-TCP::tcp not showing any usage

I am trying to configure MRTG on all of my servers for making a network weathermap, this requires running SNMP which MRTG gets the information from. So, I installed it on two servers the exact same ...
4
votes
0answers
687 views

keepalived config is not working correctly with virtualbox vms

my keepalived configuration is not working correctly. I have two virtual testing machines (virtualbox) to try some things out with keepalived/vrrp. Bot can ping each other flawlessly (internal ...
4
votes
0answers
2k views

NAT64 configuration with tayga on Debian 6

I'm trying to implement NAT64 with tayga on my server and came to a point where I'm not sure how to proceed. My server is connected via one IPv4 address and one /64 IPv6 address block to the ...
4
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0answers
1k views

Enabling IPv6 with OpenVZ using Proxmox 2.2

I'm trying to enable IPv6 on my Debian nodes (OpenVZ) using venet; my host is under Proxmox 2.2 (kernel 2.6.32-16-pve), and it seems the routing fails. My host correctly pings all my nodes; all my ...
4
votes
0answers
1k views

Jenkins slave fails handshaking on windows

I have a win2k8 machine used as our CI master server (Jenkins) I have various other servers running as slaves The master is listening for slave connections on port 2000 SlaveA - can connect to ...
3
votes
0answers
30 views

Monitor latency by IP on a bridge-enabled host

Is there a tool which captures packets, measure latency in realtime and display it with some IP filtering options for Windows ? My particular setup : Internet -> Router -> Host Master -> Host Slave ...
3
votes
0answers
24 views

Get floating ip from mmm to work on Tinc vpn on Ubuntu

I've got 3 ubuntu servers connected with a Tinc VPN right now. 2 servers are running mysql 5.6 db's, and the 3rd is used only as a monitor. We're using mmm to do the monitoring and assign a floating ...
3
votes
0answers
144 views

Windows 10 arp cache getting stuck after failed attempts when target machines are offline

After upgrading our development team to Windows 10 from 7, we are experiencing an issue with the ARP cache where a machine has the correct IP-MAC mapping cached, but the type is invalid due to failed ...
3
votes
0answers
74 views

What would cause named to send out hundreds of bogus responses?

My DNS server running RHEL 6.6 is actively sending unsolicited DNS responses to a couple of IP's. By unsolicited I mean that there is no incoming request from the external IP, the DNS server seems to ...
3
votes
0answers
61 views

Inter-connecting 2 Switches on separate racks

I have 2 Dell N4032 switches installed on separate server racks. They are inter-connected on Port 23 and 24. Servers in Rack1 can ping Switch1, Servers in Rack2 can ping Switch2. However, they cannot ...
3
votes
0answers
152 views

Is RSS (receive side scaling) in Windows considered unstable?

When asking a customer to enable RSS in their data center to improve network performance (very high UDP packets-per-sec rate), I was told that they generally turn it off, because after various ...
3
votes
0answers
78 views

Authentication and logging of users for a Wireless ISP?

I have to upgrade a Wireless ISP's (WISP) network. Their current setup consists of a router (Mikrotik RouterBoard 1100AHx2), Ubiquiti Rockets (with sector antennas) for clients, and Ubiquiti ...
3
votes
0answers
178 views

VLAN Communication between Cisco ASA 5510, and VMWare ESXi 5.5

I've having a problem, where my Cisco ASA 5510-v8.2 can't communicate with VM's in a VLAN specific port group. The Cisco ASA is currently sitting in front of a group of VM's that have public IP's. ...
3
votes
0answers
491 views

docker network freezing randomly

Sometimes , all network's of my dedicate server is freezing (ssh also not working). it's randomly repeated. OS: Ubuntu 14.04.3 LTS On server installed docker containers, and i see in dmesg logs: ...
3
votes
0answers
79 views

Does Fast Retransmit and Retransmission Timer work at the same time?

When Fast Retransmit is implemented, if I received packet 1, then I will send an ACK that says I need packet 2, and then if I received packet 3, I will send a duplicate ACK that says that I need ...
3
votes
0answers
141 views

pppd terminated bya SIGTERM in Centos 7 — who's sending it?

Folks, I created a script to keep a persistent "emergency" connection with a 3G modem, so I can access my CentOS 7 makeshift server remotely if the usual network fails. Everything works for a few ...
3
votes
0answers
134 views

Stream IPTV through SSL VPN

I have a question about streaming IPTV through Cisco ASA5510 ssl vpn. My current setup at the moment is: Public - firewall (asa5510) - L3 switch - L2 switch But my iptv source feed is coming to L3 ...
3
votes
0answers
99 views

Add a second bridge to a virtual machine

We have a ubuntu-12.04 host running another ubuntu-12.04 virtual machine with kvm virtualization and bridged network interface on eth4. This network allows the virtual machine access to the outside ...
3
votes
0answers
444 views

Automating Configuration of VMware's vSwitch (OpenStack/libvirt/Nova)

There's a lot of talk now about VMware integrating with OpenStack now. I've noticed that Nova network service is working with VMware's standard and vDS. Deploying a full OpenStack instance is not ...
3
votes
0answers
553 views

How to convert RJ45 wiring to RJ25

I have a RJ45 cable wiring. I need to use it to connect my printer to network. But the network socket that was available in my printer is RJ25 socket. I thought that i can wired cross cable which is ...
3
votes
0answers
9k views

ksoftirqd process overloads CPU with high-bandwidth and multiple network connections

I got a 10GBit Server with proxmox 2.1 installed. There's an OpenVZ container running with Ubuntu 10.04 64bit. I can get 200-300MB/sec with wget from data-center internal servers (-O /dev/null) which ...
2
votes
0answers
31 views

Possible to force TCP window scaling to a higher value?

Is it possible to increase the TCP window scaling factor on Linux (CentOS 7.2)? I have a long fat network (100 Mbps) from London to Chicago and I'm getting 16 Mbps throughput in TCP on an sftp from a ...
2
votes
0answers
88 views

How to verify network quality before running important benchmarks?

I have multiple CentOS servers around the world. They all are running a PHP script that tests the latency of some services once per minute. The problem is that sometimes these servers have local ...
2
votes
0answers
21 views

DNSMasq lookup dns for domain by interface

I have DD-WRT running dns-masq to use different name servers for a wireless access point. I want to take this one step further but I can't seem to get it working. My current setup (which works ...
2
votes
0answers
17 views

Allowing outbound internet access with NSX while maintaining micro segmentation

I am getting into the world of VMware's NSX product for the purpose of micro segmenting VM's in the datacenter. That is to say, living in the same network space but not being able to talk to one ...
2
votes
0answers
46 views

Ping problems with two interfaces, same subnet, direct connections to two separate hosts

I have a configuration of a client machine (Ubuntu 14.04.2 LTS) that directly connects to two server machines. The server machines--while on the same subnet--cannot route to each other. Packets must ...
2
votes
0answers
44 views

Slow Login on Network Windows 7

I am trying to troubleshoot an issue where it takes a very long time (4-5 minutes) for users to log on to their computers on a network, and after catching this timeline with the Windows Performance ...
2
votes
0answers
26 views

Windows Credential Manager unexpectedly restores previous state on reboot

After deleting all existing credentials in Windows Credential Manager, and adding a single, new Windows credential by IP with Enterprise persistence, the new state of Credential Manager (with one new ...
2
votes
0answers
26 views

LXC bridge with several IP addresses

While trying to setup a small server with LXC containers, I encountered a problem: I want to assign 4 different IP addresses: 1 address for the host and 3 addresses in a different net for the ...
2
votes
0answers
31 views

Manually specify a tunnel gateway for an IPSec VPN Connection (ASA)

I have currently got several VPN's on-premise that are setup on the outside interface and using the default gateway on the interface as an originating source of the VPN tunnel. Although the outside ...
2
votes
0answers
90 views

Get-WmiObject Win32_PerfFormattedData_Tcpip_NetworkInterface results in 'Invalid Class' error

On of my Nagios plugins to monitor the network load gives me problems on one Windows 2008 R2 server (out of 600). You can download the plugin here: ...
2
votes
0answers
30 views

network access issue and triage

We have two hosts in same vlan with same route rules. One of them is able to connect to an outside IP while on another I get failed: Connection timed out when testing the connectivity through netcat. ...
2
votes
0answers
59 views

Windows treats mapped drives differently based on host server type (Netware vs 2008R2), file create issues

We have a ~30 PC heterogeneous network environment. DOS, Linux, OSX, Windows 98, XP, 7 , and 10 clients, to name a few. The question: How can I get Windows desktops to treat Mapped network drives as ...
2
votes
0answers
36 views

Ubuntu Network Performance on over 2k connections

I'm using an EC2 c3.8xlarge Ubuntu 14.04 LTS machine with over 3k threads simultaneously downloading web pages one after another. Although this machine should have a 10Gb network performance, I ...
2
votes
0answers
100 views

How to use an IPv6 Edge router in an IPv4 network?

Background I have the following set-up: I use 6LOWPAN (IPv6 implementation in IEEE 802.15.4) on my sensor link that have IPv6 addresses (stateless) as aaaa::xx/64 It uses RaspberryPi (RPI) as an ...
2
votes
0answers
33 views

Is there a single Linux commandline tool that displays network connections AND processes

Bascially, I'm looking for a combination of iftop and nethogs in a single tool. iftop shows information on the network layer: source/destination target and ports, throughput and all that in a nice ...
2
votes
0answers
26 views

rx bytes increases on transfer out

When I transfer data from one machine to another, I'm seeing an increase in both RX bytes and TX bytes according to both ifconfig and ip -s link: before the transfer, on sending node: 2: eth2: ...
2
votes
0answers
39 views

Debian-Server: Incoming SSH/PING/TELNET/… works - outgoing does not

I've mentioned a strange behavior of my linux-system: After rebooting the system I can connect to it via SSH and the server responses to PING. But the server itself can not ping any other servers. # ...
2
votes
0answers
131 views

how to associate a Docker network interface to a Linux network interface (eth5) on Linux host?

My Linux host has 8 Ethernet interfaces, eth0 - eth7. I'm running three Docker 1.9 containers on this Linux host. How can I associate a network interface inside one Docker container to a specific ...
2
votes
0answers
319 views

Extremely slow VPN connection between Windows 10 client and Windows 2008 R2 Server

After a bit of hassle setting up and configuring my VPN connection on Windows 10, I finally got it connecting to our Windows 2008 R2 server using RRAS. When establishing the connection, it connects ...
2
votes
0answers
35 views

How do I add an iscsi target to a windows initiator through stock cmd?

I have many Windows Servers that need to run headless but I need to add many iscsi targets to each of the Windows hosts. I already have the iscsi target setup and have access to IP address of where ...