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

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100BASE-FX WDM vs 100BASE-BX vs 100BASE-BX10 - Are they all the same?

Are these three all the same thing being inconsistently named by different manufacturers? 100BASE-FX WDM uses separate wavelengths (1310 nm & 1550 nm) for Tx & Rx over a single strand of ...
1
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1answer
20 views

How are mirrored packets encapsulated and sent to the receiver?

I'm wanting to stress test an application I've written that takes in mirrored network traffic using Bro and processes it. I'd like to generate the traffic and present it to Bro in a way that's as ...
1
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1answer
54 views

https not working on OpenBSD 5.8 & 5.9 guests running in VMWare Fusion 8 Pro

The set up is as per title: freshly installed OpenBSD (I've tested both 5.8 and 5.9) are having networking issues when run inside VMWare Fusion 8 Pro (OS X host). Downloading http files of any size ...
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1answer
225 views

curl (56) Recv failure: Connection reset by peer - when hitting docker container

From an AWS ec2 instance (which runs docker), I am trying to curl my docker container-hosted web service. Given: [ec2-user]$ docker ps CONTAINER ID        IMAGE                                       ...
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1answer
24 views

utility of using ALL in --tcp-flags in iptables rule

I m wondering what is the difference between the following 2 --tcp-flags rules: 1) -p tcp --tcp-flags SYN,FIN,RST SYN,FIN,RST 2) -p tcp --tcp-flags ALL SYN,FIN,RST
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1answer
27 views

Connect two networks from different internet connection

Is it possible con connect 2 different networks from 2 different internet connection (one is ADSL, the other one is 4g). The are both in the same office and each one have its own router.
0
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1answer
73 views

ASA INSIDE to INSIDE traffic being dropped

An ASA 5505 is being used to route between two networks as it contains routes to everything. The following depicts the network topology. I have tried various combinations of access lists such as: ...
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0answers
12 views

Find closest (in round-trip time) hosting to a particular serivce behind CDN

I'm using some service which is located behind CloudFlare CDN, and I need to achieve the lowest latency possible in two tasks: receive lots of messages out of WebSocket WAMP subscription with few ...
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1answer
22 views

some http packets not reaching host

we are experiencing a very strange issue with http traffic between 2 machines on the same network: when sending an HTTP request there are some packets not reaching the other host as you can see from ...
0
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2answers
12 views

Troubleshooting a Web Server with Timeouts?

Have a slightly strange situation that seems like a weird DNS issue. Have a simple office website which has a very simple admin portal type area for staff to login to, and closed off by simple ...
0
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1answer
58 views

SELinux preventing Asterisk from connecting to IMAP server for voicemail

I am running Asterisk on Fedora 23 and am using the voicemail IMAP module to store voicemails to Gmail. When SELinux is in enforcing mode it prevents Asterisk from connecting to Gmail. Here is the ...
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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 ...
0
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1answer
28 views

SSH connect to FreeBSD9 suddenly started to freeze randomly

I have a KVM FreeBSD 9.2 box for a long time. 5 days ago I had a 2h ssh incoming session on this box with no freezes. No system/soft updates or significant system changes were made. Today I can't ...
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1answer
57 views

Does anyone know how Android detects the presence of internet access over wifi? [closed]

I'm working on a "spoof internet" for an art installation, and I've run into a snag that you might be able to help me with. The goal is to create a wireless hotspot that looks like it has internet ...
1
vote
1answer
30 views

RRAS NAT not forwarding for specific Hyper-V VM's

I have a Windows Server 2012 R2 installation, with Hyper-V, RRAS and NAT setup. I'm having an issue with two of my VM's and RRAS NAT: Essentially, these two VM's will not communicate outside the ...
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0answers
26 views

Allow outgoing traffic behind ipv6 firewall behind router

I am working on configuring ipv6 traffic for a project and I am running into a problem. When I try to ssh from the machines that are behind the router into the router, it blocks the connection. I ...
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1answer
18 views

Can ip address and gateway be the same and can number of clients be increased by changing the subnet mask? [closed]

So I am a newbie just learning networking and was wondering if gateway can be same as the allocated IP address. Also, if I have to increase the number of users that connect to my router (having ...
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0answers
25 views

IP Addressing assigned by provider

So basically my vdsl provider has assigned by a range (/30) of ipv4 addresses (79.78.23.14o) yes I noticed the o not 0! Anyway they are refusing to help any further I have .141 assigned to the ...
2
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1answer
37 views

IPTables Configuration to allow all connections, only close/deny once data is sent

I'm looking to set up my IPTables firewall in such a way that: Any new connect() is accepted Once data is received: If the destination port is on a whitelist, continue allowing the connection and ...
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2answers
109 views

How to setup a netem box

I'm trying to simulate different network condition based on factors such as latency, bandwidth and so on. I found that Netem is the best way to simulate different network condition. So my desired ...
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0answers
37 views

Install Intel 10 Gigabit AT2 Server Adapter Server 2012

I'm attempting to install an Intel 10 Gigabit Ethernet AT2 Server Adapter into a machine, running Server 2012 R2. Hardware Information: PCI\VEN_8086&DEV_150B&SUBSYS_A12C8086&REV_01 ...
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0answers
31 views

Disable source IP checking for Azure VM

For an Azure virtual machine, is there a way of disabling source IP checking on a virtual network, in the same way as EC2's "Change source/dest address check" allows you to do on a VPC subnet? ...
0
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1answer
24 views

CentOS: How to create a default route after server starts

I'm using CentOS 6.7 on Proxmox KVM. Now I would like to get my network-connection working. This is my config: Now I have to perform ip route add 89.xxx.xxx.1 dev eth0 and ip route add ...
0
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1answer
55 views

I can not attach additional network interface to an existing amazon EC2 instance

I need three network interfaces in one instance for my work.By default there is one eth0 but I want to add eth1 and eth2 in an instance. I created network interfaces using the same security rule that ...
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1answer
24 views

Servers, cloud and network

I need so help so I have few questions. I work in small company and we are going to be buying one or two servers for our needs. We are in area that isn't well equip with internet (only ADSL or WiMAX) ...
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1answer
40 views

UDP Server behind Gcloud load balancer: receive ok, reply fails

I have a UDP server set up (on a VM) behind the Google Cloud network load balancer. The server is bound to 0.0.0.0. The UDP server can receive messages that were sent to the balancer, but replies do ...
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0answers
32 views

iptables change source and destination ports

I would like to receive traffic on multiple UDP ports and also my application (which is listening on a single port) to know from which port the request came from. If the source port becomes the ...
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0answers
12 views

Capture no-modified packet with iptables

I have a user-space program in which I process packets. I send them there with help of iptables. The problem is that I capture not original packet but modified. I have wlan0 interface up with access ...
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1answer
33 views

windows server 2012 r2 change node type

I'd like to force a station to be Node Type p-mode instead of hybrid. In regedit: cptr\HLMCurrentControlSet\Services\NetBT\Parameters I don't find the node mode. The goal is to remove UDP port 138 ...
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0answers
25 views

lower tcp throughput than expected

I've conducted some tests which measured tcp throughput via wireless and wired connection. (a) was wired link between my desktop and my home router. (b) was wireless link between my desktop and my ...
0
votes
1answer
26 views

Azure Virtual network (classic)

I am trying to use a IIS reverse proxy running on IIS in a new Azure VM against an old classic VM. I have the server proxying onto the classic VM but this is currently over the public IP address. Is ...
0
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1answer
74 views

PFSense IPSec and NAT

Due to bad design and hosting provider constraints I have a network where I don't control the router. Our network: 172.16.0.0/12 - LAN x.x.x.0/24 - WAN (Router is connected to the switches, we have ...
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1answer
39 views

work folders access denied

I set up work folders in my organization and that was fine until last week. now I have some issue. One of my clients' works fine but mine and the others' can't access to work folders. I have admin ...
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0answers
35 views

Understanding arp request tcpdump

I noticed the below tcp dump when pinging a docker container B on bridge B from a docker container A on bridge A. Container A: 10.0.0.3 / 02:42:0a:00:00:03 Container B: 10.0.0.4 / ...
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2answers
33 views

Network share as USB connected device

I have a situation where I am having to work around a medical vendor who has for security reasons limited the connectivity to a system. The only connection I have available to the system is USB and ...
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0answers
18 views

What are the Resilient Overlay Network (RON) downsides?

What are the RON downsides? How this type of network handle with security questions? There are vulnerabilities? The RON's performance is good? Thanks in advance!
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1answer
52 views

How to diagnose/troubleshoot tftp timeout

I have 2 VMs. One is setup as a pxe server (dhcpd with a specific subnet and a tftpserver). The second VM is networked with 'vboxnet2' to first VM and it is able to get the DHCP IP as specified my ...
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1answer
57 views

Group Policies Not Applied At Startup with SSD PC

I have a problem with some new computers containing solid state drives which will not apply group policies at startup. All other PC's apply the GPO's no problem. Manually running gpupdate /force ...
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0answers
57 views

forcing proxy traffic to route via a specific 3G dongle interface

I've searched for details on how to do this but I've been unsuccessful - I wondered if someone could offer up some advice. I have 2 network cards (LAN and 3G in my case), LAN is my main interface ...
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0answers
10 views

Ubuntu KVM host

I got a default installation of Ubuntu 14.04 on my lab-pc and wanted to run a few VMs there using the virtual machine manager. I followed the official ubuntu docs and actually everything seems to be ...
0
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2answers
36 views

Does 802.1x on a Wired Network Prevent Remote Management?

I'm researching the feasibility of implementing 802.1x port security on my wired network. The supplicants will be Windows 7 PCs. The authenticator will be Cisco and Juniper switches. I'm thinking ...
0
votes
1answer
36 views

Linux host does not retransmit with a lower packet size in response to ICMPv6 Packet Too Big message

I'm seeing this in Wireshark when curling this URL: On the same network, a Windows host retransmits properly, but an Android host does not. On a different network (presumably appropriately ...
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1answer
72 views

Best way to connect dual SSID / VLAN wireless to Watchguard firewall

I'm currently sorting out our network so we can have new wireless access points with dual SSIDs, one for internal use and one for guest use. These will be setup so each SSID is on a different VLAN. ...
0
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2answers
80 views

Hyper-V guest doesn't see the internet through external virtual switch

I have a Windows Server 2012 R2 Essentials host with 1 NIC and I installed a Hyper-V guest of the same type (Windows Server 2012 R2 Essentials). I added an external virtual switch (allowing management ...
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1answer
26 views

Forwarding ports from one bridged interface to a guest container on host OS

I have a simple configuration. Mind map how everything look like So I have a structure: Proxmox Host OS (vmbr0, vmbr1) Container 1 (eth0) Container 2 (eth0) The Proxmox networks: vmbr0 ...
2
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1answer
59 views

How to configure network interface with chef ifconfig resource for IP determined at recipe runtime

I'm working with Chef through Amazon Opsworks and need to provision and configure additional network interfaces for some of my servers, and I'm having trouble figuring out how to properly use the ...
2
votes
1answer
49 views

Juniper EX3200 connected to Cisco 2900 series router - incomplete ARP entry

I'm tying to connect a Call Manager Express running on a Cisco 2900 series router to a Juniper EX3200 switch. I have both configured on VLAN 4, with both ports in access mode but when I connect the ...
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2answers
63 views

connecting two switches with different ip ranges

I have two switches that assign different DHCP IP addresses. one assigns 192.168.0.x to devices that are connected to it and the other one assigns 10.0.0.x ip addresses. Is this the reason I cannot ...
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0answers
18 views

Why does a VPN fixes connection issues on games [closed]

My ISP company is giving me troubles when I play some online games. While monitoring the network using WireShark, I was able to identify a TCP Retransmission on a packet with a certain sequence number ...
0
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1answer
41 views

Why is TTL increasing? (and generally behaving erratically)

Summary: TTL is not decremented when pinging hosts on a "network path" My laptop (10.10.13.10) is connected via OpenVPN to a server (10.10.13.1) which hosts several network interfaces. One of them is ...