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

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Cannot connect to port over the internet (works from localhost)

I'm running something (=Faye server) on port 9292: david@theta:~$ lsof -ni tcp:9292 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME ruby 2406 david 13u IPv4 1579461398 0t0 ...
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1answer
38 views

How do I properly configure host server net adapters when using Hyper-V?

I am converting a number of physical servers to virtual ones, and I have a question regarding configuring the physical adapters on the host server. I am new to virtual machines, and have a nagging ...
1
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1answer
70 views

Cisco ASA - difference between inside_access_in and inside_access_out?

So a minor problem we have is any internal servers have no (non-icmp) access to the outside is being blocked. Our current config is: inside_access_in any ---> any ---> icmp inside_access_out ...
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1answer
26 views

How to route load from one server machine to another on falure?

I have two HP Proliant servers. Both have same configuration and same data (Replicated). Currently all production load is on Server A, while Server B is idle. Now I want to configure my network such ...
1
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1answer
55 views

Hitting Ephemeral TCP Port Exhaustion

We run a high traffic website. Over the past few days, we've had several customers complain of sporadic downtime that we cannot reproduce. We have several web servers elected to receive traffic from ...
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0answers
25 views

server 2008, SMB issues after changing to virtual network

I have a windows 2008 server that I use as AD, DNS, and mostly for file sharing. I wanted to use hyper-V to add a virtual Linux box for some network monitoring software. So I added the external ...
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2answers
32 views

Can I use an LC-SC fiber optic cable with a 10G NIC that only mentions support for LC-LC cables?

Specs (ftp://ftp.supermicro.com/CDR-NIC_1.32_for_Add-on_NIC_Cards/MANUALS/datasheet-AOC-STGN-i2S.pdf) for Supermicro Fiber NIC AOC-STGN-i2S say it supports LC-LC 10G cables. Is there any reason to ...
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1answer
38 views

What is the purpose of these routing tables

I examining a debian router's configuration. Route output: 71.71.71.0 0.0.0.0 255.255.255.224 U 0 0 0 eth1 10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 ...
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1answer
96 views

Get a static internet ip address [closed]

Whenever my router goes off my IP gets constantly changed, which is not favourable when running an online service. How can I prevent this from happening?
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1answer
74 views

Teaming two NIC: iperf shows 200MB/s downloads but only 100MB/s upload

I have: One client with two 1000Mbps NICs, teamed using round-robin method One master with a 10Gbps NIC They are connected with a Huawei 10G switch (S5700). Then I ran iperf -s on master and ...
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1answer
40 views

Maxing 4-6 Bonded NIC

I have been load testing different configurations of hardware and using a Dell R610 w/ 4SSD in RAID 0, 24GB ram and 2 L5640 (2.26Ghz w/12MB L3). I was able to get great performance out of the RAID ...
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0answers
28 views

Local MySQL connection using eth0 rather than lo loopback

We've installed MySQL 5.6.22 on RHEL6.6 and noticed terrible performance compared to a previous install on RHEL6.5 and MySQL 5.6.20 The main thing that we've noticed is that all the traffic appears ...
9
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1answer
259 views

Why do “net use” and windows “map network drive” share have a drastic speed difference?

Why, when I copy a file (windows explorer copy, paste), am I getting ~100KB/s transfer rate from a drive mapped using the "net use" command in the command prompt and between 25-50MB/s transfer rate ...
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1answer
54 views

Redirect all traffic on my network to a welcome page [closed]

When someone connects to my network and tries to browse, I would like to redirected to a welcome page. I know there are some commercial solutions for hotspots out there, what I am looking for is just ...
0
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1answer
62 views

Strange TCP Flood / Flood from Port 445

Good Evening. Today I noticed a strange flood on a box that I am working with, here is a dump from tcpdump: 23:21:07.580917 IP (tos 0x0, ttl 64, id 5746, offset 0, flags [DF], proto TCP (6), length ...
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0answers
33 views

OpenVPN Traceroute Issue

I have the following basic OpenVPN configuration: Datacenter Side: Subnet: 192.168.168/24 WAN->Router(192.168.168.1)->OpenVPN Server(192.168.168.200) Config File: port 1195 dev tun remote ...
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0answers
72 views

How to create openvpn tunnel between multiple interfaces between two hosts ubuntu linux

I want to create OpenVPN tunnel between two Ubuntu 12.10 hosts which has two interfaces, say: Host1: eth0, eth1 Host2: eth0, eth1 A tunnel is wanted between: Host1 (eth0) <-> Host 2 (eth0) ...
3
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3answers
1k views

How to disallow external access to 127.0.0.1? [closed]

I use tcp socket on 127.0.0.1:9000 to connect nginx to php5-cgi. However I want make sure that no extrnal request can be made to this IP, so that no attacker can obfuscate IP and bypass nginx to do ...
0
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1answer
38 views

xp clients on sbs network have limited or zero access to specific websites, win 7 ok

Could anyone shed some light on access to some websites from xp pc's on our network.. For a few weeks now browsers on the xp machines either can't or have very limited access to some websites. Win 7 ...
3
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1answer
84 views

How does Windows 2008 specifically select ephemeral ports (does it test to avoid conflicts)?

I have a server application which uses permanently connected incoming ports within the range that W2k8 now uses in the IANA recommended range of ~49000-65000. (For legacy reasons it's extremely ...
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1answer
86 views

How can I block all traffic to/from an bridged interface while allowing DHCP?

I have a PC (running Fedora 20) that is being used as a "software switch" to control the network connectivity of some external devices. There are eight such devices; the PC has two 4-port Ethernet ...
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1answer
44 views

Is there a Universal/Generic Default Gateway Address in IPv4? [closed]

Is there a universal and/or generic default gateway address in IPv4? I'm looking for something similar to the way you can always reference a NICs IP address from itself with 127.0.0.1 regardless of ...
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2answers
40 views

Private Network Interface between to MacOSX servers

We would like to set up and private single cable connection between two Mavericks servers, that also need to talk to the rest-of-the-world. The two servers for sake of argument are DB and Web. There ...
2
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1answer
65 views

Semi-regular network failure (Dropped RX Packets)

Networking is not my specialty, and I have done my best to try and isolate this problem, I would like some pointers as to how to further narrow down what the issue may be. Server: File Sever running ...
2
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0answers
24 views

Why does the lxc container binds more than the configured ip?

I set up several ubuntu LXC containers on my ubuntu server. They all have a unique IP configured. As they start up, some of them do bind more than the defined IP address. For example container A ...
0
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1answer
25 views

whitelist limited ec2 IPs with third party service provider

We have an application running on ec2 which talks to a third party service. The third party service provider requires us to give them 13 IPs for whitelisting. My limited understanding of ec2 is that ...
0
votes
1answer
119 views

Vagrant hostname resolving for host machine [closed]

I'm setting up a Vagrant-driven workstation environment for a web development company. For every project there will be a custom Vagrantfile with custom Puppet setup etc. using a custom base box. All ...
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0answers
22 views

What does ipg/ewma mean in an output of ping -f?

I pinged in a flood mode: # ping -c 1000000 -f 127.0.0.1 and I got the following output: PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data. --- 127.0.0.1 ping statistics --- 1000000 packets ...
2
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1answer
41 views

Security risks with distributing files with bittorrent

So I am evaluating different options for distributing very large files between several sites without completely crashing my servers and my IT infrastructure. My best option so far seems to be some ...
0
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1answer
30 views

IP route not on default gateway

I am trying to setup a network that is only accessible if you go through the '10.222.3.1' switch. It is a test environment that we do not want interfering with our production environment. The trouble ...
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5answers
161 views

What happens if ISPs mess up IP allocation?

I've been wondering about this for a long time but never really got around to asking it. I know that a lot of companies were initially assigned IP addresses within the /8 (Class A) range and a lot ...
22
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3answers
2k views

New service decision: IPv6 or IPv4?

While hosting new service these days, what would be best decision. IPv4 or IPv6 ? If we decided to launch it on IPv4 address: How easy/difficult to get IPv4 address (considering they getting ...
0
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0answers
102 views

Wrong SNMP ifSpeed and ifHighSpeed values from Cisco RV 110W

My Cisco Small Business RV110W Router reports wrong SNMP ifSpeed and ifHighSpeed values for eth0, vlan1 and vlan2 ( 10 Mbit/s instead of 100 Mbit/s ). This causes my SNMP management software to ...
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1answer
107 views

SSH failing to connect, No supported key exchange algorithms

There are numerous questions with the same title however none of the solutions apply to my issue. I get the following lines of error in my sshd log: Jan 6 21:57:55 <computer name> sshd[30103]: ...
13
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2answers
1k views

Tracing a network cable that is already connected to the network

Some remodeling was done while I was away from work, and I'm left with several unlabeled cat5 cables that are terminated with RJ45 keystone modules. On the other end, all of the cables are terminated ...
0
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1answer
52 views

How can I configure these two Sonicwalls to exchange traffic?

Site 1 has a TZ210 with a content filtered WAN. Site 2 has TZ 105 and an unfiltered WAN. The end goal is to direct traffic from a VLAN on Site 2 to the WAN on Site 1. From Site 1 I can ping to ...
2
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1answer
111 views

Windows 7 VPN to OS X Server error 629, Tried a lot of options

I am having a hard time connecting to my office server in which I am the admin of. I have recently wiped the hard drive and re-installed os x yosemite with os x server. I use a Windows 7 machine at ...
1
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1answer
102 views

CentOS Minimal Installation - Ports blocked?

I am trying to connect to a new CentOS 7 server to do some performance testing. It is a minimal install and at this point the only things installed / configured are to test RAID performance, Java 1.7 ...
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0answers
40 views

Windows Server 2008, Route LAN IP to choice of Gateway

On my windows server i have a WAN and LAN interface. ON my LAN interface the ip is 10.200.0.1/16 and my WAN has an ip of 192.168.20.100 with multiple gateways192.168.20.1, 192.168.30.100, and ...
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0answers
76 views

Linux tun interface packet routing

I have questions on the ip packet flow for the following scenario. The scenario is : A tun0 (10.0.0.2/8) interface and a physical wireless lan card wlan0 (ip address not fix) on the client side, ...
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1answer
44 views

Palo Alto and 802.1q

I have a Palo Alto firewall connected to a link that runs 802.1q and the provider has assigned a specific VLAN for us to use. However I cannot ping the other end of the link, if I replace the Palo ...
0
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1answer
24 views

Why adding a route here is throwing up an error?

I have a linux Fedora -16 machine that has two interfaces - em1 Link encap:Ethernet HWaddr B8:CA:3A:89:EE:F1 inet addr:136.170.195.17 Bcast:136.170.195.255 Mask:255.255.252.0 ...
2
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1answer
402 views

Proxmox with an Openvswitch bridge

All, I'm trying create a way for me to be able to use the local network within my Proxmox infrastructure. Currently, everything is running off of NAT from wlan0 and all internal machines have the ...
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1answer
100 views

device vs interface vs connection under linux with nmcli [closed]

What are dependencies and relations between device, interface and connection in nmcli cmdline utility under linux? The below questions are asked in context of nmcli and networking in linux: Which ...
0
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1answer
34 views

Connect remotely to an APIPA assigned host

I had the unfortunate (and not correctly planned) event of having one of my remote Hyper-V hosts assigned an APIPA address hence i cannot connect by any means on it. Funny thing is, i can RDP to the ...
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1answer
43 views

How to check if mail ports on leased server are blocked?

I recently switched companies on a dedicated web server and strongly believe that they are blocking ports 25 and 110. Initially, I thought that it was my active Windows Firewall settings but reviewed ...
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1answer
54 views

Sonicwall and vlans single wan IP use for public wifi

Good evening, I have a sonicwall nsa2400 with single wan interface assigned with single wan ip. My ISP only provides me one static IP address. X1 is connected to the main lab switch to provide network ...
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1answer
92 views

VirtualBox Networking Lab Configuration [closed]

I'm creating a lab for a project that will test a network security defense product's effectiveness in detecting various attacks. I have a physical server with 32GB of RAM and VirtualBox to create the ...
0
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2answers
43 views

Forward only internet traffic through VPN

The title probably needs some work, sorry in advance. My network is small and consists of a server with one NIC, a desktop computer and a few laptops. There's one wireless router (running OpenWrt) ...
1
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1answer
101 views

unable to connect to public postgresql rds instance

I created a basic test PostgreSQL RDS instance in a VPC that has a single public subnet and that should be available to connect over the public internet. It uses the default security group, which is ...