Newest networking Questions

Q&A for system and network administrators

Wireshark not decrypting TLS packet

I am unable to understand why decryption does not work here. Consider the scenario in this pcap file - https://drive.google.com/open?id=0Bz5corUPBatBWWpXTFYwWjdfS0k I have a network setup such that ...

IPTable rules to restrict eth1 access to ports 80 and 443

I have a service (Elasticsearch behind proxy) listening to customer traffic on ports 80 and 443 of eth1. The servers hosting my service also host other admin/privileged access content on eth0 and ...

Routing all traffic via Raspberry Pi with OpenVPN on a OpenWRT Briged AP [migrated]

I want to route all traffic on my OpenWRT router via my Raspberry Pi that has a OpenVPN client connection. I have a simple setup: +-------------------+ +---------------+ | ...

Remotely connect to a database instance on a Azure VM without RDP?

Preface I'm a developer by trade, so network security isn't really my purview. However, solving problems is my purview, and I've got one with which I need help. Also, please forgive me if I get any ...

Grouping multiple VMs and their connectivity via Resource manager templates

I have a product, which is comprised of 2 VMs, (one linux and other freebsd), and they need to inter-connected via a private bridge on some network/subnet. Additionally, each may need more subnets ...

How to access a HTTP server using a name instead of the IP [on hold]

The client infrastructure: 1 notebook with Ubuntu as a server, that runs a Rails application on IP 192.168.0.199 port 3000. 1 TPLink Archer C50 router that assigned the IP ending with 199 to the ...

Assigning static IP address [migrated]

Hi all I want to assign static IP address to my Windows server 2012 virtual machine . I use a broadband connection via router. I added an IP address in routers DHCP static IP table and provided IP ...

Can services on a 100.4.0.0 subnet connect to services on a 100.5.0.0 subnet? [duplicate]

I'm trying to figure out how to handle networking for a docker swarm. Specific usecase I may have upwards of a 1000 microservices I need for each microservice i.e. a group consisting of a db, app ...

Setting up docker owasp/zap on an AWS EC2 instance, and connecting to it

I've been tearing my hair out for the past few days about this. I have an EC2 instance spun up with Ubuntu on it and have set up my AWS instance so that all traffic accessing port 8088 and 8090 are ...

Transparent Proxy to Docker Network Means TCP is Broken

My logging setup is a single Docker host with UDP 514 exposed for syslog. An nginx container has its port published so when you send logs to 10.1.1.100 (in the image below) it first hits nginx, whose ...

Virtualize using IPs under GRE Tunnel (or NAT?)

Well, this is the situation I am experiencing: I've got a dedicated server from OVH, and a dedicated server from another company, since the maximum RAM for the OVH server (GAME category) is 64Gb of ...

Windows Azure - Routing Point-2-Site - Communication: Local PC --> Azure VM

I am trying for hour now to communicate between two computer. Local PC AzureVM They are both connected via Point-2-Site VPN. The VPN itself works like a charme and isn´t hard to handle. But I don´t ...

Looking for effective method to estimate required hardware for network appliance

I am working on developing a network appliance (VPN concentration) and need to propose to customer proper hardware. The best way I know is to test that application on some simulated topology, but it ...

Robocopy Error 5

When using robocopy to backup data in a directory tree to a NAS, I keep getting Error 5 - Copying NTFS Security to Destination Directory. Access denied. for folders which shouldn't return such error. ...

How do ephemeral ports work through NAT?

I think I'm correct in saying that: OSes generally use the IANA ephemeral port range of 49152 to 65535. Apps generate a random ephemeral port to establish a connection from the client to the server. ...

IPTABLES DROP not hitting for external devices

I have a router/gateway that is 10.1.1.1/24 I have a server running Ubunutu server 16.04 with 3 interfaces. ens3 = 10.1.1.250/24 (outside) ens4 = 10.1.2.250/24 (inside) ens5 = 10.1.3.250/24 (not used ...

Bonding + VLAN - can't access server after networking restart

I hit some interesting case around bonding (+VLANs) in Ubuntu 16.04 (not sure if version is relevant). My /etc/network/interfaces: auto lo iface lo inet loopback # eno1 configuration auto eno1 iface ...

Unable to view IP connections using netstat-nat in Ubuntu 16.04

I've setup NAT on an Ubuntu server (16.04) and have used TCPdump to verify that NAT works. I'm now trying to use netstat-nat to view the connections so I can quickly demo it working without resorting ...

Sticky session support in Pacemaker load balancing by using clone

Could you please tell does "Pacemaker clone" load balancing supports sticky sessions? I was able to understand that it uses Round Robin algorithm for load balancing, but when it comes to particular ...

Isolate network interface from system except from one docker bridge

I have two separate networks, one which is trusted and one which is untrusted. The trusted network contains a server. Blue is the existing, trusted network and the big box is the server, which is ...

Advantage on using dual NICs for streaming [on hold]

I currently have a 20/5 mbps connection. If I use 2 separate NICs 1 dedicated to streaming (OBS allows you to bind to a NIC) and a second one for gaming connected to the same network would I see any ...

Servers randomly stop communication with other servers

This is now happening more frequently than I imagined. I have two servers in same location directly connected to ISP, on static provider's IPs. Servers constantly communicate with remote server ...

Layer three to ease router workload [closed]

I will be beaming (microwave) to two other buildings a fast Wan connection. All three buildings share the same WAN router, and each building will have three SG500 Cisco switches. If I just use the ...

How to point subdomain from one server to public_html/folder on my server

I have domain on one server mydomain.com There is subdomain on that server subdomain.mydomain.com That subdomain should point to other server to public_html/myfolder. Please advise how to do that.

is there any real Difference between snort and suricata?

Looking to move forward in deploying IDS/IPS on several FreeBSD firewalls and I was curious about the difference between snort and suricata. I know that Suricata is multi-threaded but in terms of rule ...

questions about nagle vs. delayed ack

I read online delayed ack combined with Nagle algorithm can have performance issues. But as I understand, Nagle algorithm is delayed ack. If they are not the same, what’s the difference?

How is the communication between two instances Aplication and BD [on hold]

I have an instance of applications(jboss) and another instance of BD(mysql) my doubt is that I notice that the communication between these two instances is for a public ip. My Quiestion is. Is ...

Can a Remote Desktop Client share a local network connection to the Remote Desktop Host?

I know it is possible to share a client's local resources with a remote desktop host. Is it also possible to share a client's local NIC with the host server, over remote desktop, with the host? ...

How does load balancer manage TCP connections

I have questions about handling TCP connections by load balancer. I have three servers behind my load balancer, and sometimes due to some processing tasks it happens that no data is being sent ...

How do I use Cisco CDP Monitor?

Hello everyone I have used Cisco CDP Monitor in the past, with that being said months ago right after install it was very user friendly and ready to use. All I had to do was open it and press start, ...

DNSMASQ config for wifi hotspot

Aim of the setup is to create a wifi hotspot that shows web pages from local machine. I have a pc with two interfaces wlan0 and eth1. I have installed dnsmasq and hostapd. Users connecting to ...

adding interface to bridge docker0 failed: exchange full

I am attempting to spin up 2000x containers on my server ... however I am getting the following error after 1023x have been created: "docker: Error response from daemon: failed to create endpoint ...

DHCP Specific Mac whitelist for multiple subnets

i want to create a group of mac addresses which can be read from an external file, using include "filename" i can make this work for any individual single subnet, but if i try to add the group to ...

Public key authentication fails on port 22 but succeeds on alternate port

I am able to log into my server with a password, but not with my public key. I'm running CentOS release 6.3 (Final) on a Rackspace.com server I added my local ~/.ssh/id_rsa.pub to the remote server's ...

Forward traffic into docker container/VM

I have a pretty beefy machine at my disposal running Ubuntu 16.04 Server. It's running several docker containers and virtual machines (using VirtualBox) referred to as VMs hereafter. At the moment the ...

Creating uptime monitor - Identifying network bottleneck [duplicate]

So I'm working on a website uptime monitor that should check thousands of websites per minute by doing a simple http call to them and checking the received status code. I've tested it using multiple ...

What port to ping on windows machine to check if it is online? [migrated]

As the question says, I'm using this PHP function to check if an IP address on specific port is answering. function ping($host) { $port = 5900; //RealVNC default port $waitTimeoutInSeconds =...

How do I calculate for IP and their subnet Mask [duplicate]

Please sir, I'm new to this site and I work with an WISP company here in Africa, I really fine it difficult to know the various IP addressing and subnet mask to assign to each device.

How to auto route traffic between networks? [closed]

I have 1 computer connected to two networks (3g and wifi). The 3g connection used to a company network and the wifi connection used for internet. I want to use both network simultaneously. however, ...

Can you run an sdn across datacenters?

This is entirely for R&D purposes, not actual production use, for now. But can you run an sdn, say an overlay network for example, across datacenters? I.E. would I be able to run flannel on a ...

Files created by Samba always sets g+rwx when ACL is used

I'm using ACLs to enable rw access to both local and samba users, and noticed that group permissions is always set to rwx. This is the ACL set on the test directory: ubuntu@server:/test$ getfacl . # ...

IDr payload missing error in VPN logs

textPayload: "IDr payload missing" insertId: "********" resource: {…} timestamp: "2017-02-22T08:45:21.308309618Z" severity: "DEBUG" logName: "projects/astral-chassis-xxxx/logs/cloud.googleapis....

access denied on published exposed port from another container in same docker network

I can not connect to one container in the network lonelyisland from another residing in the same network. docker run --rm --name spaceship --net lonelyisland --expose 8080 -p 8080:8080 --ip 172.18.0....

Window network bridge not working for guests [closed]

I recently bought a second Ethernet interface for my Windows 10 machine (TP-Link TG-3269 in particular, the first interface is the one built into my BIOSTAR TZ77B motherboard) in hopes of making a ...

Printer is presenting network problems, but responds to ping normally. How to isolate the error?

Our office large format printer (which I'm told does not buffer) is presenting network issues. Whenever something is put on its queue, the printer will go offline, stop responding to pings, and will ...

Why would my router internal network address conflict with the fibre modem? [on hold]

I'm having my new router R under the fibre model F. F internal address is 192.168.1.1, external address is normal pubic IP address R internal address is 192.168.1.1, external address is dynamically ...

Can a switch that doesnt know anything about 802.1ae macsec route macsec frames?

This may seem a bit of a stupid question, but I'll ask anyway. If one device (e.g. A wireless router) is attempting to communicate with another device (e.g. some gateway to another network) through a ...

How to route traffic from OPENVPN access server through VPN Client Gateway?

I have a Linux OpenVPN access server behind a firewall and is connected to the internet. I then have another separate internet connection with another firewall and a client windows machine behind that....

What network configuration shall I use in VMWare Fusion to make two local machine communicate? [migrated]

So basically the question is the title. I'd like to be able to ping from a user machine a DNS I've configured following a protocol I know for sure is working. However every time I ping from the user ...

How to configure Netgear AirCard 810S on centos 6.8?

I work on CentOS 6.8, I have conected on (working) USB LTE/4G Router Netgear AirCard 810S. I also have connected and configured LAN connection with Internet. I want to configure my CentOS to use LAN ...
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