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 views

What is the difference between an Up MEP and a Down MEP for Ethernet OAM CFM?

I'm having trouble understanding the functional difference between an Up MEP and a Down MEP in CFM applications. Some sites say they are defined based on network direction, others seem to think they ...
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0answers
13 views

Hyper-V VMs keep losing network connection

We had a major power loss in our server room two days ago and several Cisco Nexus 2232PP FEX devices went down. We were able to get everything back online, but since that event we've been experiencing ...
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28 views

NGinX > Allow visits only via domain, block by IP address

I have a Dedicated Server with 2 IP's eth0 = 1.2.3.4 eth0:0 = 1.2.3.5 I am trying to block people from accessing my server via my IP address. Ideally I would like them to only be able to access it ...
2
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1answer
53 views

How do I make a connection private on Windows Server 2012 R2

After a restart of one of our servers (a Windows Server 2012 R2), all private connections become public and vice versa (this user had the same problem). Stuff like pinging and iSCSI stopped working, ...
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0answers
16 views

Unable to ping a computer with the same IP-range in another network through routers in the middle

I have two routers that are connected to each other through Ethernet. Their WiFi-interfaces are broadcasting two networks with same ESSID, IP-range and subnet-mask, using different channels. The ...
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2answers
24 views

(network unreachable) error in my server logs

I'm getting lots of network unreachable lines in my Centos' messages log file. They seem they can't resolve to certain addresses which I do not have any ideas why my server has to resolve to them in ...
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0answers
14 views

Direct port 443 to 8443 on using ip6tables only? [duplicate]

I am running CentOS 5, running Kernel version 2.6.18 & ip6tables v1.3.5. IPv6 is enabled. I would like to use ip6tables to direct traffic from port 443 to the internal port 8443. We did this on ...
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14 views

How to enable VLAN on a Tomato router, and use for vSphere.

I saw a question asking "What is a VLAN?" So I guess the only stupid question is the one not asked. I somewhat understand how VLAN works, but not physically. I have my router on the main floor -- ...
2
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0answers
27 views

Non-local IP for next hop in routing

I'm working with an MPLS network and I am slightly confused about some route entries. Interfaces are (these are fake IPs): eth0 10.10.10.1/24 (LAN) eth1 10.9.9.1/24 (MPLS) eht2 2.2.2.2/24 ...
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1answer
21 views

Input traffic spikes on outside interface at same time every day

For the last two days I've had this issue where our internet connection SLOWS to a crawl and is almost unusable. I logged into our Cisco ASA 5500 (not very well versed with it) but I was able to see ...
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1answer
23 views

Cannot access Windows default shares using windows credentials

I am on (Windows 8 -ADMIN-PC) (192.168.1.10) with DNS. My other PC (windows 7 -USER-PC) (192.168.1.11) with same DNS In my PC (Windows 8 -ADMIN-PC) I try to access user-pc by using windows explorer ...
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1answer
8 views

Forwarding traffic from one virtual interface to another

I have a router with two ethernet interfaces: eth0: 1.1.1.2 (with 1.1.1.1 gateway) eth1: 2.2.2.1 I created two new virtual interfaces: eth0:1 : 1.1.1.3 (with 1.1.1.1 gateway) eth1:1 : 2.2.3.1 ...
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0answers
26 views

Redirect Default Gateway Traffic in Linux to File

I am trying to troubleshoot one of my linux servers (ubuntu server). Therefore I want to intercept all traffic that is sent to the default gateway and then write it to a file: preferably some kind of ...
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0answers
17 views

Intermittent VPN connection in VM [on hold]

I have a Virtualbox VM running Ubuntu on my Win8 host. It uses NAT for the network. When I connect to my VPN on the host machine, the VPN connection from within the VM is really spotty. To do ...
0
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1answer
31 views

3 NICs in VMware ESX 5.5.0 cannot connect to each other

I have a Vmware ESXi 5.5.0 hypervisor, installed on a desktop pc with 3 physical NICs. The first NIC is connected to the internet (WAN), the 2nd and 3rd NICs have Access Points installed (plugged in) ...
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0answers
16 views

lost pings and after replug works fine

I have an strange problema, on one floor, the computers randomly lost internet, I checked and I see that if I made a ping, it lost 90% of packets, I changed the switch, the computers Works fine before ...
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2answers
56 views

Why can my servers not access their own addresses?

I have two VMs on CentOS 6.5, running Plesk 12, and the webserver is Apache 2.2. One is a clone of the other, and I inherited them setup by someone else. My problem is that I can access my sites ...
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0answers
14 views

base filtering engine fails to start - error 5 access denied. Server 2008 R2

We had a major server fault over the weekend where some hard drives and the mainboard's raid controller failed. Mainboard and HDD's replaced - the Windows Server 2008 R2 is loading up, but many of the ...
0
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1answer
40 views

iptables not allowing ssh

This is my iptable configuration. But I cannot connect with ssh with these rules. What am I doing wrong? I want to block all traffic except ssh coming from x.x.x.x ip address. iptables -F iptables -X ...
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0answers
7 views

whilst on a vpn cannot access some cdn sites [on hold]

I use windows 7 machine and a VPN to access a remote work computer. This worked fine and I was able to also access skype simultaneously on the home machine (to take a work call with smooth sound) and ...
3
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1answer
36 views

Cisco CVE-2014-0224 Vulnerability

We have a Cisco RV-042 Small Business router and our PCI scans flagged it as being vulnerable to CVE-2014-0224 (CCS Injection/Man-in-the-Middle). It appears to be another OpenSSL vulnerability. We ...
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1answer
32 views

can same private IP will communicate? [on hold]

Suppose Company A's Lan's network address is 192.168.10.0/24 and B's LAN network's address is 192.168.10./24. when company A brought company B..then as usual they also need to make communication ...
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3answers
33 views

understanding resolv.conf nameserver through system calls

I am trying to understand how /etc/resolv.conf /etc/nsswitch.conf exactly works and what is significance of nameserver entry 127.0.1.1 I did strace ping google.com to get to know about the system ...
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3answers
50 views

Test port reachability from a remote host even though the port is not bound to a service?

I need to check whether a remote host is able to reach a specific port. At the time of test the service bound to that port will be down. The possible issues that the test would address would be : ...
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0answers
18 views

CentOS 7 (Dracut) - Network boot with gateway in different subnet

I'm trying to auto-setup VM guests with CentOS 7 using network boot and kickstart with external network connectivity based on linux bridge. And I'd like to have solution lightweight, simple and ...
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0answers
36 views

Website that is active occasionally can’t be accessed on browser [on hold]

I'm having an issue where when browsing my website it will suddenly go to cannot display page. It's running Apache on CentOS 6. The weird part is the server is fine to my knowledge and actually only ...
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0answers
34 views

WAN speed vs internet [on hold]

Why does it happen that if I open a webpage hosted by a server , which is a part of WAN (Access Network) , it takes longer time to open than a webpage hosted on internet. Technically , a webpage over ...
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0answers
21 views

Why is the first of two post-up commands for routing in interfaces configuration not automatically processed

We managed to connect our servers to two distinct networks and everything works fine. We use routing rules that ensure that server responds to the right network. I followed the instructions under ...
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2answers
41 views

How to force the network machines to get the ip from a DHCP server? [on hold]

How can I force all the network machines to get the IP from the DHCP server and prevent them from manually editing the network configuration. There are both Linux and Windows machines. The DHCP server ...
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2answers
38 views

is it possible to have Web server and NAS on the same hardware microsever? [on hold]

I have a HP microserver proliant gen 8, and i want to know if there's a way to make this hardware work as NAS with freeNAS ... etc, and in the same time make it work as a web server with Centos Nginx ...
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0answers
17 views

Receive many UDP packets & ksoftirqd load

I want my server to be able to handle more than 1Mpps from a 10g card. Is it possible? I have Ubuntu 14.04 with kernel 3.11 and a 16 core Xeon machine. It seems that ksoftirqd becomes bottleneck in ...
2
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2answers
79 views

Can PoE kill unmanaged switches?

Two simple unmanaged switches have died in the same cabinet in two years, one at 18 months and one just today at six months. Both times we gradually experienced increasing intermittent verified ...
0
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2answers
55 views

Is there a way to find which IP I am connected to?

Let's say my eth0 interface has multiple IP addresses and I can connect with SSH to any of these. Is there a way to find out which of those I am connected to? (The background is that certain ...
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1answer
54 views

How to trace dropped TCP connections?

Trying to help someone with a situation where TCP connections get mysteriously dropped after a few minutes for no apparent reason (this happens even with non idle connections). Both client and server ...
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1answer
39 views

How can I access a Virtual Machine on different subnet? [closed]

I have two virtual machine VMachineA and VMachineB using virtual box. VMachineA (CentOs 6.5) has two network interfaces: eth0 (IP: 192.168.3.48, GW: 192.168.3.1) and eth1 (IP: 10.10.200.1). ...
0
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1answer
27 views

tomcat-webapp not accessible via port after windows-update

we are running 4 Virtual Machines on a MS HyperV Host. On one of the VMs (192.168.50.15) we have multiple Tomcat-Webapps on separate ports - 9010: Jenkins - 9020: Atlassian Jira - 9030: Wiki .. ...
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0answers
24 views

Proxmox VE: Multiple shared public IPs with NAT configuration

I have a Proxmox VE (v3.3 @ Debian 7 Wheezy) and got 3 public IPs routed to that server. It is my aim to have multiple VMs sharing those IPs using a NAT configuration so that I can forward single ...
0
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1answer
80 views

BIND failing to resolve with 'WARNING: recursion requested but not available'

there are no errors in the logs and query logging won't initialize iptables is fully disabled but the server will respond with "WARNING: recursion requested but not available" because my client ...
0
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1answer
38 views

Routing from VLAN to Internet via L3 Switch

Please excuse the brain-dump - trying to solve a problem that's had be running around in circles for an entire day! TL;DR - Clients on two networks separated by a L3 switch can see and ping ...
4
votes
2answers
485 views

Will blocking port 25 on a router cripple outlook clients?

I work at a small ISP, we manage about 60 buildings with p2p radios and a main cisco router at a central location. Recently we were notified that a phishing domain is associated with one of our IPs. ...
0
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2answers
25 views

Software installation by group policy

I have a server with windows 2008 r2, it is connected N client. Clients use software that releases updates. Is there an application that I install on the server, which allows you to select the ...
-4
votes
2answers
21 views

How to get forwarded with ssh [closed]

Let's say I, I know somebody's host IP-Address and the IP-Address of some lxc-container which is running on this system. When I only have the password for the user of this lxc-container and not the ...
0
votes
2answers
65 views

Forwarding HTTPs requests to another webserver

I have an Ubuntu 12.04 Server connected to two subnets. Eth0 is 20.20.20.1, it hosts an Apache Web Server on port 80. Eth1 is dynamic IP address in 10.10.10.0 subnet. This server is not a gateway ...
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0answers
18 views

Oracle VM Generating High Network Traffic [closed]

We Have IBM Blade Placed at Cloud Location and Connectivity Between our office and Cloud location is through dedicated 6 Mbps network (Layer-2) On IBM Blade Windows 2012 Server with Hyper-V. We have ...
0
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1answer
83 views

Is this a botnet? [closed]

I manage networking equipment at a small ISP for 60 highrise buildings. Each building has anywhere from 1 to 60 24 port switches, or some DSLAMs, or some coax gateways, with p2p radios on the roof, ...
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0answers
26 views

Resources to learn network administration for techie beginners [closed]

I'm thinking about switching my home network over to a UBNT or a Microtik based setup. What are some good tutorials or books to get me started on Vyatta or RouterOS? I'm an engineer with decades of ...
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0answers
55 views

iSCSI connection drops frequently - Synology NAS

I have a Windows 2012 R2 Server connected through iSCSI to my Synology Rackstation 2414+. The problem is that the connection drops very very frequently, up to 10 times a day (manually restored ...
-7
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0answers
24 views

Possible to make your own config site for a modem without one? [closed]

My last modem broke in a thunderstorm and after i bought a new one i found out it apparently didn't have it's own page. Is it possible to some extent make your own?
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1answer
36 views

UDP Proxy with cloned packets

Having UDP messages sent from dynamic public IP periodically to public IP X:20000. Need a proxy that listens in IP X:20000, then forwards duplicate/clone packets to X:20001 and a different machine ...
-1
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1answer
36 views

Can't set up the default route from a sublan to the WAN [closed]

I am trying to connect one of my PCs to the Internet via a WiFi network using a notebook. Here is my network : (Wifi) <=============> (Notebook) <===============> (Desktop) ...