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

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2answers
39 views

Disable all outbound network

I cannot seem to find any information on how to completely disable all networking. Essentially I want to flip the switch for any outbound or inbound networking. Like the wifi button on my computer, ...
2
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0answers
21 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
33 views

Packet loss between windows guest and Ubuntu 14.04 host

We are seeing packet loss between one of our Ubuntu 14.04 hosts and a KVM guest running Windows 2008 R2. The loss only shows up at high loads. Similarly loaded machines running 12.04 do not exhibit ...
4
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0answers
59 views

Configure Juniper M320 as Ethernet/STM transparent converter

There is Juniper M320. We need to move ALL the traffic from one port to another. Everything that comes to one port goes to another and vice versa. No snooping or any other processing is required. One ...
0
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0answers
4 views

VPN Connection Over 3G [migrated]

I have a PPTP server running on my linux box, and i can successfully connect an android client to it using WiFi but when i try to connect to the server using data-connection (3G) it fails to connect. ...
0
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1answer
22 views

IPsec transport mode and MTU

[Similar to Right way to set the MTU of an IPsec Client (Linux/Racoon), but different in that there is no router on the responder side] I have a setup where machines in a local network need to talk ...
0
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1answer
61 views

Is ARP Connection oriented or connectionless?

Is ARP Connection oriented or connectionless? It uses TCP, but does that consider it connection oriented?
0
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1answer
36 views

Secondary IPs on DMZ machines not working

I am moving some virtual machines from my DMZ in a bladecenter over to my new cisco UCS. We are using Hyper-V, and are running Server 2012 on the old bladecenter, and Server 2012r2 on the new UCS. ...
3
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1answer
21 views

meaning of rx_queue_*_csum_err and rx_fifo_errors

I am trying to debug some networking issue with one server. I monitor this machine with multiple monitors and I see that at times ping error rate jumps to 5/10% I am running on ubuntu and I see that ...
2
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2answers
46 views

Assign multiple IP and Gateway in Ubuntu Server

I'm trying to find an option to add/assign multiple IP addresses and Gateways to the Ubuntu Server. The reason behind is, I want to access devices from two different networks. For instance I may want ...
0
votes
1answer
39 views

conflict in network interface configuration of CentOS 6.5

I am trying to create 2 network interfaces, one with DHCP and the other with static IP on a CentOS VM running on ESXi Server. Content of file ifcfg-eth0 is as follows: DEVICE=eth0 ONBOOT=yes ...
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0answers
12 views

GCE firewall with Source Tags

Created an instance in GCE, tagged 'tagA' Created firewall rule: tcp:12345, source tag tagA, target tag tagA On the instance executed: nc -l 0.0.0.0 -p 12345 netstat -an | grep 12345 tcp ...
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0answers
15 views

Cant get Vlan to work on tomato shibby (AP) [migrated]

Im setting up a small network. The hardware used is: HP 4330s with pfsense( As a router ) -> Broadcasting vlan1000(Admin) and vlan1001(Guest) Zyxel gs1900-24e (Switch) Asus RT-N66U firmware replaced ...
0
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0answers
12 views

Cisco 877 Initial Setup - Enable SDM

We purchased a used 877 and installed IOS and reset to factory defaults with a console cable. Now I just need to set it up as right now connecting via ethernet and pinging 10.10.10.1 won't connect (ip ...
1
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0answers
30 views

VMs with same name an IP

Does Foreman support managing several VMs with same name and IPs, but with different certname? for example: NAME IP CertName VMLinux001 10.0.0.2 VMLinux001@domain.com ...
1
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0answers
60 views

Limit ESXi guests to one public ip

I've been scratching my head on this issue the past few weeks. I've been searching but can't find the answer I want. Maybe I'm just bad at searching though. In any case, any feedback on this issue is ...
0
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0answers
19 views

amazon ec2 instance going to a remote ip using openswan tunnel is up but no traffic being established on the remote ip

I having establishing a vpn tunnel to a remote peer/public ip using amazon ec2 openswan. The tunnel is up but no traffic has been seen on our side or the remote side? Is there I been missing? Please ...
1
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1answer
39 views

Unable to ping between ESXi host and Netapp storage on the same switch

I am unable to ping between ESXi host and Netapp controller that are both connected on the same switch and configured for private IP addresses. Yet I CAN ping between 2 Esxi hosts and between 2 ...
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0answers
18 views

Change NIC index

I know there are several ways to query for the Index number of a NIC on windows (route print from CMD) but I wanted to know if there was a way to change that number to an index number that is not ...
-1
votes
1answer
30 views

How to check what application is requesting port? [duplicate]

Is it possible to check which application is requesting specific port in a debian server? I'm getting a ton of these in iptraf: x x UDP (77 bytes) from 172.16.0.2:25748 to 212.59.1.1:53 on eth0 ...
0
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0answers
8 views

Windows 7: Packets not going through [migrated]

I have a simple setup: A) A Windows 7 PC with a Wifi adapter and an ethernet connection. B) A raspberry Pi Wifi Access Point C) A router connected to the internet. A and B are connected via Wifi. ...
0
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0answers
17 views

sg300-10 problems with vlan connections

I was hoping someone could give me a pointer on a VLAN setup issue i am having. My Enviroment: Cisco S300-10 Switch (set to L3 Mode) I have uploaded a newb drawing of my switch config in the hope ...
2
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0answers
22 views

Http Request Hangs Client Side

We've run a website for several years with thousands of visitors. Very rarely the following problem happens to a certain group of users: A certain user of that group makes a client side action on his ...
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votes
3answers
54 views

ping and traceroute does not work when UFW deny outgoing by default

How to make ping and traceroute work after setting UFW with deny outgoing by default? Here is my UFW configuration: sudo ufw status verbose Status: active Logging: on (low) Default: deny (incoming), ...
0
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0answers
5 views

Resolving DNS lookup when using a proxy on a adhoc network [migrated]

I have a network with the following setup: Box A(client) has a local HTTP/S proxy running Box A is set to use 0.0.0.0:7777 as a HTTP/S proxy The proxy service forwards all traffic to box B(proxy) ...
0
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2answers
96 views

Intermittently high ping times to router via Wi-Fi

On my local network there are (among others) 5 machines (running Debian Jessie or Arch) wirelessly connected to a Netgear WNDR4000 router. Below is a graph of the ping times to the router from each of ...
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0answers
11 views

Using a PC to replace main wireless router [migrated]

I have a media server and would like to re-purpose it as the main router machine with my wireless APs branching off it and so using it as default gateway, DHCP, Port forwarding etc.(probably with a ...
0
votes
1answer
48 views

qemu, kvm: Guest: No DHCPOFFERS received

I'm trying to set up a virtual machine (guest) wich should act as router (ubntu 14.04). The host is a CentOS 7 machine (4x LAN). The guest should get a public ip address over it's eth0 (guest), wich ...
0
votes
1answer
35 views

find given subnet is overlapping in Active Directory subnet

i am looking for vb / power shell script. i need to check given subnet is overlapping with AD subnet or not. For eg. if i gave input as 192.168.2.0/24 subnet the script need to check this subnet is ...
0
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1answer
39 views

Switch Default Gateway to Another Router with Different Subnet

My diagram: Currently subnet 192.168.8.0/24 get internet connection from modem A via the Default Gateway 192.168.8.1, my goal is to divert the 192.168.8.0/24 subnet in order to get internet ...
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2answers
38 views

Restricting internet access of some client systems of LAN to a few websites using gateway

How to limit internet access of most systems in my LAN to a few websites and block all the other websites? Also want to bypass that restrictions for some systems. All systems have static IP address ...
-1
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0answers
39 views

VM to VM communication without linux bridge

VM1 ----- VM2 Currently my VMs are acting as a SWTICH and they send L2 BPDUs and LACPDUs. I am using a Linux bridge for VM to VM communication on KVM. But linux bridge drops L2 BPDUs and LACPDUs ...
5
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2answers
191 views

VMWare distributed switch, VMs from different hosts cannot ping one another

I am using ESXi 5.1 in the hosts, I have setup a distributed switch with corresponding uplink and port groups. When migrating to distributed switch, it seems that VMs from the same host can ping one ...
2
votes
1answer
45 views

Are MAC ID passed via DHCP Relay

Do MAC ID pass through dhcp relay? Even if its connected on the WAN from the internet? So if the DHCP Server is on the WAN of the router and connected to a DHCP server on the internet is it passed?
6
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7answers
250 views

Windows 7 computer: “No internet access”, can browse internet, can remote into it, cannot activate office 2013, cannot join domain

Like the title says, I've got a Windows 7 machine that connects to the network just fine, I can use it to browse the web, including https://officesetup.getmicrosoftkey.com/, I can connect to it via ...
0
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0answers
27 views

Cisco ASA 5505 - IPSec remote VPN accessing secondary subnet

Layout: modem (pass through) -> Cisco ASA 5505 (Lan 192.168.10.1) -> (Wan 192.168.10.2) Netgear N600 Router (Lan 10.1.10.1) -> workstations (server=10.1.10.34) VPN connection to ASA no problem. I ...
0
votes
1answer
28 views

How to expose DomU's to router network?

I currently have a server connected to a router through a single NIC. The server has a running XEN setup with several DomU's. Everything seems to work fine, I can access internet from both Dom0 and ...
1
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0answers
43 views

Route traffic for a specific IP through a specific interface

I'm setting up a server that tunnels all its traffic over an OpenVPN connection. The VPN connection is further tunnelled over obfsproxy hosted on the same machine. The problem is that as soon as the ...
6
votes
2answers
716 views

Estimating distance between two servers by IP address

I was reading the GFS (Google File System) paper, and there's a statement: Our network topology is simple enough that "distances" can be accurately estimated from IP addresses I was curious ...
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votes
1answer
31 views

Online tool to calculate IP mask [closed]

I know there are so many tools to calculate a network range starting from an IP and its mask (192.168.1.0/24) but do you know an online tool to calculate the mask starting from first and last IP ...
0
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2answers
39 views

cannot migrate from vswitch to distributed switch with only one physical NIC

I am trying to migrate vmkernel management interface from vswitch0 to vDS on ESXi 5.1 as lots of documents on the internet are describing , but it keeps disconnecting me and reverting the changes ...
2
votes
1answer
87 views

Windows Server 2012 R2 runs out of ephemeral ports, though it shouldn't

We are regularly experiencing strange issues with networking on our dedicated server. It runs Windows Server 2012 R2 x64 on Xeon E5620 with 16 GB RAM and Intel 82575EB network adapter. Please note ...
2
votes
1answer
48 views

DHCP Relay behind two router

If i have a DHCP Server above two routers and a cleint computer below and the client computer is connected to a router with DHCP Relay, will dhcp pass through those two routers? Here is an example ...
1
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0answers
21 views

PacketFilter on OS X preserve destination address for sshuttle [migrated]

There is a cool utility out there called sshuttle (https://github.com/apenwarr/sshuttle). It has depended on ipfw to forward packets in the past. It appears that ipfw is mostly broken in Mavericks ...
0
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0answers
35 views

(RouterOS) IPSec server can't find static policy on client connection

When trying to connect to server that have following settings: /ip ipsec peer> print 0 address=0.0.0.0/0 local-address=0.0.0.0 passive=yes port=500 auth-method=rsa-signature ...
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0answers
113 views

Ping connected Clients to VPN tunnel PPTP

I have set up a vpn server on CentOS 6 (PPTP) following this guide... Server End ifconfig ppp0 Link encap:Point-to-Point Protocol inet addr:192.168.1.15 P-t-P:192.168.1.200 ...
0
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1answer
17 views

Debian Bridge Network Connection — Static IP Addresses

I have a PC with 3 Ethernet ports. I am able to share internet to the other two ports with internet coming in on eth1. I use the following setup on /etc/network/interfaces after aptitude bridge-utils ...
0
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1answer
21 views

Add bound IPs to /etc/network/interfaces, without network downtime

Setup is Ubuntu 14.04.1 LTS or Debian 7. I can assign bound IPs to network interfaces without network downtime with ifconfig, but it doesn't persist across restarts (unless you use rc.local, which ...
3
votes
1answer
93 views

Dell Blade server Networking fundamentals?

i'm planing to purchase Dell m1000e blade server, if i want to connect the server to a SAN server via Fibre Channel Blade Switch Modules should i install fiber channel host bus adapter (mezzanine ...
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0answers
23 views

Is there a way to set a static IP's last 3 digits only in linux? [migrated]

I need to set up several ubuntu systems that will end up being plugged into routers with varying IP addresses. For example, 192.168.1.x or 192.168.0.x, etc. Is there a way of assigning a static IP ...