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

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36 views

Multiple DSLs connected to single HP server

networking noob here! Got a pretty specific question. Is it possible to plug 10 cat5 (network) cables that come from 10 different DSL modems to an HP server so I have 10 different broadband lines ...
0
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0answers
11 views

why my nat iptables rules dont work with marked packets?

System: debian squeeze, Linux server 2.6.32-5-amd64 #1 SMP Tue May 13 16:34:35 UTC 2014 x86_64 GNU/Linux, iptables v1.4.8 lsmod | grep iptable iptable_security 2176 0 iptable_mangle ...
3
votes
1answer
70 views
+50

Iptables LOG rule inside a network namespace

I'm trying to setup iptables rules for a docker container. I'm using nsenter to execute the iptables command inside of the container's network namespace: # log access to port 8080 PID=$(docker ...
0
votes
1answer
18 views

DNS problems with a static IP configuration in a VM

I am using Parallels Desktop 10.2 for Mac on OS X Yosemite. I am trying to configure my my client (Ubuntu 14.04) to host a website that is available to the host via a particular domain name. In the ...
2
votes
2answers
110 views

Add a fake hop in tracert?

A client wants to add a fake hop when someone does a traceroute on his IP address. He has two ip addresses, and one interface (no problem, virtual interfaces solve it). How should I proceed? Is this ...
0
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2answers
29 views

Combining two subnets with same default gateway

This is the current situation: Subnet 1: 192.168.1.x (255.255.255.0) with default gateway on 192.168.1.1 Subnet 2: 192.168.90.x (255.255.255.0) without any gateway (no internet access) -> all ...
0
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0answers
4 views

Can I use same suricata instance for both IDS (for L3,4) and IPS (for L3,L4,L7)?

I have a interface where traffic is flowing from internet to NGINX server to application server. I want to monitor (IDS) the traffic flowing between Internet and NGINX at L3,4 and IPS the traffic ...
1
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1answer
30 views

CentOS 7 no biosdevname at install time

I know that I can use net.ifnames=0 biosdevname=0 in grub to use eth0 instead of enp0s3 or whatever but how to I specify this at install time in a kickstart file?
0
votes
1answer
14 views

Static route to Single IP using SSL connection

I am trying to configure a static route to a single IP. My question is two fold: How do I specify a single IP using a subnet mask x.x.x.x/? (not a range of ip's) My pc is making an SSL connection to ...
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0answers
5 views

How to route VPN traffic through a separate internet connection with a SonicWALL firewall?

We have a depot quite some distance from the exchange, the expensive internet connection is only getting 2/1Mb. This causes constant drops as soon as someone downloads anything. We have now got a 4G ...
2
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1answer
42 views

Device not accepting connections from a forwarded port. Security Issue?

I am forwarding a port through to a PLC/Management unit type device for a heatpump. The device accepts local connections from the LAN on port 80. It runs a normal web site on port 80 for management. ...
0
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0answers
18 views

Why would my logged public IP differ depending on the type of server (or computer) I am connecting to?

I am writing a p2p gaming lan emulator that uses the torrent infrastructure to network peers, set up lobbies, etc. Currently, the only infrastructure we are using is the trackers (we plan to us Tox ...
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0answers
12 views

Connect 1 computer with to 2 networks, route through 1 VPN

Suppose the following scenario: I have a question, I am sure it has been asked but I do not know how to word it or what to look up. My Problem: I am a high school student of an advanced Video ...
3
votes
2answers
884 views

Winbind/AD: Local users with identical AD usernames

We are getting ready to add Winbind/Samba to some CentOS servers. Identity Management for UNIX is running on our DC, and it's testing well so far. There is one scenario I'm having trouble with, and ...
0
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0answers
12 views

GigaVUE-420 ERROR: failed in probing PCI device [on hold]

A unit that was picked up was booting to the RedBoot prompt, but I was able to get it to load the image now I am getting the below message on bootup, and then it hangs. +eth0 mgmt port: NO LINK No ...
0
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2answers
37 views

Avaya 4850 GTS & VSP 7000 - setting up a fibre trunk, no MLT

I'm a junior network/sys admin, and I'm stuck (and my seniors aren't sure what to do). I have a VSP 7000 switch which is a core switch. And a 4850 GTS switch which is like access switch. The switches ...
6
votes
3answers
3k views

Windows Server 2012 R2 performance for Mac OS X Clients (File Services)

I am inheriting a Windows 2012 R2 Server that is experiencing abysmal SMB/CIFS performance for Mac OS X Clients in particular. The server is doing file services and is an Active Directory Domain ...
0
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1answer
197 views

Secondary DPM server and access to protection agents at primary server

Disclaimer: This is not an ideal setup. In a perfect world we would have a direct two-way VPN between our site and the remote site. My task is to enlighten the consequences of running a System Center ...
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0answers
5 views

error 500 web page share point

In my environment we are having 3 branches eg:A B C all the branches are protected with cyberoam firewall also ..and IP to IP trafiic is Allowed to all three branches. Recently A branch is able to ...
0
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3answers
2k views

Hyper V with local DNS and forwarding - nslookup works but ping gets general failure

I have a Hyper-V virtual machine configured with its own DNS manager and entries for testing. The VM DNS manager is setup to forward all other requests to the "regular" DNS servers. This all used to ...
2
votes
1answer
3k views

Watchguard config, drop-in or mixed-routing mode?

I have a Watchguard XTM 2 that is currently acting as a firewall and a router for my business network, I currently have the WG setup in mixed-routing mode and am happy with the current configuration. ...
0
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1answer
35 views

EC2 Network Interface with secondary Private IP, not showing on Interface in Windows

I have a windows server 2012 r2 instance on EC2 under VPC, I have two Network Interfaces. The Primary Private IP is shown in windows for both. I have a secondary IP address on one of the network ...
0
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0answers
21 views

Filtering KVM guests with IPtables

My partner has a server with OVH that receives a constant variety of ddos attacks, while still staying up. We want to use IPtables on the host to filter the guests VM's traffic. The guest VM we want ...
-1
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0answers
17 views

Routing traffic using IP tables for two NICs [on hold]

I have two NICs (eth0 and eth1). I want to block all traffic (Incoming/outgoing) on eth0 except for port 25 and 993, and allow all other traffic (Incoming/outgoing) on eth1. What's the easiest IP ...
0
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0answers
36 views

ESXi + pfsense traffic segregation [migrated]

I'm kind of new to setting up networking with ESXi and working with pfsense, so please excuse if this cannot be done or I'm asking something the wrong way. I'm using ESXi 5.5.0 and I want to host ...
2
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6answers
984 views

Building a compact, affordable SOHO server?

I'd like to know if someone was able to build a compact server for SOHO users (ie. to handle email, light CRM, file server) for a total price of €150/$200, and have enough room to host a regular size ...
5
votes
3answers
7k views

IIS: How to tell if a slow time-taken is due to a slow network connection

According to http://support.microsoft.com/kb/944884, "when a large response or large responses are sent to a client over a slow network connection, the value of the time-taken field may be more than ...
0
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0answers
36 views

Subnetting and VLANs for Multiple Buildings Strategy

Curious for a little feedback on how others do this. A site I'm looking at has multiple buildings connected by fiber and each is on their own subnet. 192.168.0.0 - Building 1 - VLAN10 192.168.1.0 - ...
0
votes
1answer
25 views

Forcing traffic through an IPS on a flat network through a bump in the wire

I have the following topology: Click here, unfortunently I don't have enough rep to post images Essentially I would like the packet flow to go from PC1, to the Core Switch, to the Edge Switch, and ...
0
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1answer
35 views

Unable to set a bridge over bonding on Debian

I have a Debian 8 Jessie machine with two interfaces (eth0 and eth1) bonded in balance-rr mode (aka 0). It works smoothly, but when I try to set up a bridge on it, it doesn't work. My ...
7
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0answers
71 views

Vendor whitepaper says: 5Mpps no prob. I'm hitting already a wall at 120kpps. Where's the bottleneck?

HP's whitepaper on their Broadcom QLogic NetXtreme II adapters, which includes the specific NIC that I'm testing, states (page 7) that their small packet performance for packets up to 256 bytes/packet ...
1
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1answer
1k views

Accessing Workgroup Shared Folder from Domain

I have a domain and a workgroup. My users are supposed to upload files on regular basis to several shared folders on the workgroup. I have difficulty accessing the workgroup shared folders without ...
1
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0answers
28 views

socat TCP file server

I'm trying to set up a simple socat fileserver using TCP to send small files (~100KB). Here are the one-line servers and client for one file: Server: socat -u -d -d OPEN:file.dat ...
0
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0answers
45 views

Understanding a computer providing a bridge to the Internet [migrated]

Where I work we have a very old Linux machine that is doing our DNS/DHCP and other network services. That machine is our Default Gateway and all internet connections go through this computer somehow. ...
4
votes
1answer
2k views

Unable to make work both private and public ip network on openvz container in Proxmox

I'm using Proxmox 3, it is a fresh installation. For those who know, I'm using OVH Vrack 1.5 (along with a previous Vrack 1.0). My server has two interface eth0 and eth1, I succeeded to configure ...
7
votes
2answers
12k views

Bridging LXC containers to host eth0 so they can have a public IP

UPDATE: I found the solution there: http://www.linuxfoundation.org/collaborate/workgroups/networking/bridge#No_traffic_gets_trough_.28except_ARP_and_STP.29 # cd /proc/sys/net/bridge # ls ...
1
vote
2answers
1k views

Routing between multiple Mikrotik Firewalls

I have 2 Miktorik RouterBoards, an RB1100 and a RB951G. The 951G is acting as my Wireless box, and has Guest, Internal and Internet Only Wireless networks. The RB1100 has 3 WAN connections (2x150/10Mb ...
1
vote
1answer
34 views

Tcpdump/Iptables on bridge interface without assigned IP address

I have set up a bridge interface without an ip on it. $ brctl addbr br0 $ brctl addif tap0 $ brctl addif tap1 $ ifconfig br0 up As seen above, this bridge is connecting 2 TAP interfaces setup ...
0
votes
2answers
3k views

TCP port numbers reused and TCP Retransmission

Facing issues due to TCP Port Reuse and Retransmission for HTTP traffic. My deployment is as follows: enter image description here I have a squid proxy installed on a unix machine which is sending ...
1
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3answers
2k views

Ubuntu Server 10.04 Heavy Network Traffic causes disconnect

I'm currently running a headless Ubuntu 10.04 server. Installed is the LAMP stack, Joomla, Virtualbox, phpvirtualbox, webmin and proFTP.. It resolves the IP address so I can access it remotely (either ...
0
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3answers
1k views

how to enable SFTP port on the server

How can I enable sftp port on the server? When I type the following command in the command prompt, it gives the following result: C:\Documents and Settings\muralik>telnet kmkhub 22 ...
0
votes
1answer
33 views

dual-homed Centos 7 cannot be ping'd or ssh'd from some on LAN, sees ssh connection refused on one subnet

I have 2 subnets, A and B and a router connected to both A and B and the WAN. I have 4 servers dual homed on subnets A and B, 2 of them are Mac OS and 2 of them are Centos 7 (1503). They are all ...
3
votes
1answer
5k views

Unable to see Samba server by netbios name

We have a linux server set up with a number of samba shares on our mixed windows/mac/linux network. The shares are accessible if we go to \\192.168.x.x\share, however we can't access the server by ...
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0answers
21 views

Internet access not working on VPN set up with OpenVPN: DNS issue [on hold]

I need to set up a VPN using OpenVPN to use it in my project. I did my researches about this subject and I found that the best solution is using OpenVPN. And I try to find a solution to set up a VPN ...
15
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10answers
2k views

What *nix based command can I use to find my external IP?

Similar to a http://whatismyip.com lookup. It would obviously need to query a computer out there. Just wondering if anyone had a clever way to do it?
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1answer
2k views

UDP port appears to be in use but is not shown in netstat or TCPView

I've encountered some strange behavior I don't understand. I'm installing software on a Windows 2003 Server. This software needs to bind to a specific UDP port an all TCP addresses in order to listen ...
1
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1answer
1k views

FreeBSD Jail own network stack with vimage

I want to throw all services from the host system and put them in jails. Unfortunatly this doesn't work for file sharing (e.g. nfsd) because the jails don't have there own network stack by default. I ...
3
votes
2answers
4k views

Windows 8.1 Wireless Authentication WPA2-Enterprise

For the network at my University I have to set wireless authentication to WPA2-Enterprise using TKIP encryption. Since Windows 8.1 doesn't seem to have the usual wireless settings, I tried doing it ...
1
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2answers
1k views

KVM: All network traffic to one guest (firewall)

I am currently using a VMWare ESXi 5.5 server for my virtualisation. The network setup is like this: PFSense firewall is the center of it all and connected to: LAN Network (physical NIC 1 assigned by ...
41
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7answers
27k views

What is “anycast” and how is it helpful?

I'd never heard of anycast until a few seconds ago when I read this SF post. The wikipedia entry on it is quite formal and doesn't really evoke a mental picture of how it would be used. Can someone ...