Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.
0
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1answer
25 views
TCP application accessible remotely but not locally
I am trying to help a friend figure this out, so I don't know all the details, but I figured I would post on here to see any possibilities.
We have a custom application that communicates using a ...
0
votes
3answers
23 views
Does changing the Primary DNS Suffix of a Windows Server 2012 machine require a reboot?
My server has the following IP Addresses:
127.0.0.1
192.168.100.103
208.nnn.nnn.180
199.nnn.nnn.29
It's FQDN is mymachine.example.com. However, calling ...
0
votes
1answer
14 views
Multiple NAS-IP-Address check attributes in FreeRadius?
is it possible to have an OR statement in freeradius check attributes?
I have say 10 VPN servers that authenticate from freeradius. Most users can access all servers but I have a demo user that can ...
0
votes
0answers
13 views
kvm guest having temporary network drops
I have a Scientific Linux 6.3 KVM host running 2 nearly identical Ubuntu 11.04 guests. I built 1 base image and then cloned. Each vm has mysql and different RoR app installed on apache, using nginx as ...
0
votes
0answers
10 views
OSPF LSA Performance Tuning [migrated]
Does it make more sense to modify the 1800 second refresh rate, pacing timers, or all of the above in terms of network stability/best practices/etc to achieve quicker LSA maintenance?
0
votes
2answers
67 views
Is there a good reason for ICMP to be called a layer 3 protocol? [closed]
ICMP is categorized as a layer 3 protocol in the osi model, but as far as i can tell it does not meet the definition of a network layer protocol. It does not provide addressing or packet routing (it ...
3
votes
0answers
19 views
Does speed of ZFS snapshot rollback depend on number of files?
I have tested a 10Gbit connection between two hosts to be able to read a 10GB file from host1 and write it to host2 using netcat, where the speed was 410MB/s.
When I ZFS send/receive again with ...
0
votes
1answer
18 views
Adding an ipv6 range with dual stack
I have a range of ipv6 addresses available (native) and want to use them. I 've setup the kernel to support ipv6 and installed the necessary tools (iproute2 etc).
I am having a problem understanding ...
0
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0answers
14 views
Bridging Network for Xen (Ubuntu)
I'm renting a dedicated server and I have 10 Usable IP addresses. The CPU is a Xeon e3-1230v2 and I'll be provisioning 7 Xen VPS's on it. 1 vCPU for each, and then the last available CPU will be ...
-1
votes
0answers
13 views
I can't get a second router to extend my network over powerline adapters [migrated]
I have a main router Netgear DGN2200 then I have a cable from the LAN to a Belkin powerline adapter. Up in my loft I have the other powerline adapter connected (via LAN) to a second router, a Netgear ...
1
vote
0answers
13 views
Can ebtables BROUTING/PREROUTING package to INPUT or FORWARD table?
Can I decide the direction of package with ebtables?
See the diagram above, when raw package come, I want to the package goto FORWARD table rather than INPUT table with ebtables, directly.
The ...
0
votes
2answers
27 views
Reverse-back ssh
I have a workstation and I need to connect to a remote server via ssh. Server is under Solaris 11. I can connect to remote server, but when I try to ssh back from remote server to my workstation, I ...
1
vote
1answer
31 views
dhclient not working at boot
Here's the problem:
root@home:~# ping 8.8.8.8
connect: Network is unreachable
root@home:~# dhclient eth0
RTNETLINK answers: File exists
root@home:~# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) ...
0
votes
2answers
24 views
After DCPROMO, going to URL of website doesn't work (same as domain) due to DNS issue [duplicate]
I just created the office PDC and its the same domain name as our actual website. The problem I am having is the DNS Server does not point traffic to the correct IP address. I've experienced this ...
-1
votes
0answers
33 views
How to setup transparent firewall using ArchLinux [migrated]
I am trying yo setup a Transparent Firwall using ArchLinux.
My setup looks like this:
(ISP, IP: 10.90.10.254)
\
\
\ (eth0-> ip: 10.90.10.1 gateway: 10.90.10.254)
+-----------+
| ...
-3
votes
1answer
93 views
I need a 5th port on a 4-port modem [closed]
I'm managing a big building, with a lot of services/vendors and I have a DMZ'd 4-port cable modem, Model: SMC8014, that has 4 separate networks branching off each of its 4 ports. Each network has its ...
-1
votes
0answers
19 views
Issues compiling 8.035.00 RealTek driver [closed]
Since the 3.7 kernel (I'm using 3.9.4), it is impossible to install the network ethernet card RealTek 8168. I downloaded the 8.035.00 driver (the last) from RealTek's site and here is the output of ...
1
vote
2answers
95 views
Linux machines cause network to freeze
I am running a small network with 20 or so hosts and a machine running Ubuntu Server 12.04LTS as the gateway. Every few days I find that the network is frozen and that no two machines can ...
-1
votes
0answers
15 views
Discussion: Issues that could be faced during network design and implementation [closed]
I'm raising this discussion as I'm looking forward to go into the world of network design and implementation. But I lack knowledge in this field. I already got knowledge in troubleshooting and ...
3
votes
1answer
42 views
Two sites connected with wireless point to point: how to configure and ensure internet traffic goes through local broadband?
Scenario:
Two offices a short distance apart. Let's call them Main and Remote. Both have ADSL broadband. Windows network in Main. Currently different subnets. 192.168.16.x in Main and 192.168.0.x in ...
4
votes
1answer
84 views
Route being ignored by linux
I have a SLES server, running kernel 2.6.5-7. It's got one interface, and several routes like this
root@server:~ # ip route show table main
10.0.5.0/27 via 10.1.1.161 dev eth0
10.0.5.32/27 via ...
-1
votes
0answers
20 views
Three routers behind eachother in the network; port-forwarding and wifi [migrated]
I have setup the network throughout the house, but it is quite complex and often fails somehow.
router #0 (192.168.0.1) which is also the modem and has incoming connection
router #1 (192.168.1.1) ...
0
votes
1answer
23 views
LAN has two entry points - how to manage traffic
I asked this question yesterday when I (seemingly) couldn't get traffic across my router.
I've spent a lot of time since then with packet capturing, the ASA 5505 cli/ASDM and wireshark.
I've ...
-2
votes
0answers
19 views
How to use RDP or direct proxy [closed]
I apologize in advance, I am not sure how to even phrase the question. Basically, I spend a good deal of time in a library, but there is a very restrictive firewall in place. However, I can use RDP ...
1
vote
0answers
46 views
802.11n router supporting 802.11n as WAN connection?
I have an existing 802.11n WLAN router with an Ethernet connection as its upstream WAN connection (router A). I would like to get another 802.11n WLAN router (router B) and have it use router A as ...
1
vote
1answer
24 views
Kvm Guest Network Unreachable
I have a kvm setup with several guest vms running ubuntu.
For some reason I cannot get traffic through port 80 from the guests to the outside anylonger. The other way round works just fine, the ...
-1
votes
1answer
53 views
Why we need to care about switch and hub? [closed]
I am new to networking, and I have a very fundamental question about router, switch and hub. I Know the router can perform the switch and hub's functions from my networking class. I am always ...
1
vote
1answer
37 views
How to Emulate/Simulate Slow Network to test my web application?
I have built an asp.net application which works well in my network but I am getting complain from users that it doesn't work well in slow network. How to emulate this so that I can test my app on slow ...
1
vote
0answers
57 views
Smartphone conflicting with LAN?
Recently, I've been having sporadic problems with internet connection on some computers.
It turns out that an IPhone, when connected to the wlan, was causing this. These computers with Internet ...
1
vote
2answers
28 views
Debian 'ignores' /etc/network/if-pre-up.d/iptables
I want my iptables rules to automatically be loaded on startup. According to the wiki on Debian this can be done by placing a script with the name iptables in /etc/network/if-pre-up.d/ So I did, this ...
0
votes
0answers
26 views
linux kernel configuration to filter multicast traffic based on interface
I have two virtual interfaces (eth0.2, eth0.3) in my PC. I am sending multicast data from eth0.2 to eth0.2. Multicast data is received in eth0.2 but also received in eth0.3, the other virtual ...
-4
votes
1answer
44 views
Can this network connection work? [closed]
Assuming I want to ping from Server 1 to router
router
-LAN ethernet cable -
fiber to ethernet converter
- Fiber Cable-
Server 1
3
votes
2answers
88 views
Troubleshooting network latency
An apartment complex has fiber internet and is experiencing latency problems over the last month.
Tenants frequently experience timeouts and corrupted webpages. The current work around it to refresh ...
2
votes
1answer
42 views
VM Host Physical Nics - one switch or multiple?
We are currently trying to rearrange our network for performance. Having already begun to solve the issue that our network diagram looked like a straight line, I am now looking at the 4 nics for the ...
-1
votes
1answer
41 views
Process that consumes more bandwidth [closed]
When I do an ifconfig I see that my interfaces eth0 RX is about some Gigabytes, even I did not run any video or audio over the network nor do some peer to peer staff, please all I need is to identify ...
2
votes
1answer
37 views
In what scenarios is untagAll (access) VLAN port mode useful?
On my Avaya ERS2550T switch each port can be set with a native/primary VLAN I can assign other secondary (depending on the mode) VLANs that will be associated with this port.
I can configure ports ...
0
votes
1answer
22 views
throttling traffic with tc, but bandwidth is wrong
I am using these commands to set up bandwidth throttling:
tc qdisc del dev eth1 root
tc qdisc add dev eth1 root handle 1: cbq avpkt 1000 bandwidth 100Mbit
tc class add dev eth1 parent 1: classid 1:1 ...
-2
votes
1answer
25 views
GRE tunneling in vmware vsphere guest [closed]
Is it possible to make a GRE tunnel between a dedicated linux machine and a vmware vsphere guest VM (running debian wheezy)?
0
votes
1answer
23 views
Server Network Fails whenever a Client Computer connects to Server
I have an IBM x3400 server at a remote site, running SBS 2011 Premium. This is a really remote site in outback Australia, about 3000 kms away from me at present. Yesterday their network went down ...
0
votes
0answers
17 views
Check IP Blocking on Windows Server 2008
I am hosting my site findeclinic.com on godaddy server.
When I login to google webmaster tools, from last 5-6 days I am getting error regarding Google connectivity issue.
It says googlebot is not ...
0
votes
1answer
19 views
Network request intercept preventing local connections
I'm experiencing a really weird issue on my Ubuntu 10.04 web server where something appears to be intercepting my network requests. Most importantly it's preventing me from performing local ...
-1
votes
0answers
17 views
LAN members Ubuntu machines can't see each other [closed]
I have LAN with three ubuntu 12.04 machines. Everyone see only itself and router:
nmap -v -sP 192.168.1.2/24 | grep -v "host down"
Nmap scan report for D-link.HomeGateway (192.168.1.1)
Host is up ...
-1
votes
1answer
27 views
How multicasting grouping address works ? How can I add nodes to the existing group of multicasting group? [closed]
I am a newbie to the networking and working on the 6LoWPAN protocol and I am trying to get the multicasting to work on the network. But I don't know how to create group for multicasting and how to ...
2
votes
1answer
50 views
Company VPN on same subnet as home network
My company has a PPTP VPN (I know it's not very secure) on a 192.168.1.0 /24 subnet.
For people connecting from their home networks, file sharing doesn't work if their subnet is 192.168.1.0 /24.
Some ...
0
votes
2answers
53 views
monitor network packet rate per IP
my problem is that I've got a report that my IP was used in a DOS attack. Problem is that I do not know which computer is infected and the attack is not active anymore.
Is there simple Linux tool for ...
1
vote
1answer
30 views
XenServer - Does the Hypervisor act as a router?
I have a XenServer installed running multiple OS's testing GlusterFS. My Colleague says that the Xen Hyper-visor routes the connectivity inside the Hyper-visor and it never enters the network. That is ...
0
votes
1answer
63 views
Puppet agent not starting?
I've attached the full output with debug to see if anyone can make sense of what is going wrong. I've tried removing /etc/puppet/ssl/ and the two nodes (agent and master) are able to ping each other ...
0
votes
0answers
30 views
How to allow virtual lan communicate with router?
Using VMWare Workstation 2010 to create Windows Server 2008 R2 virtual machines:
I have created domain controller Server 2008 machines with static IP addresses. In order for these machines to ...
-2
votes
1answer
36 views
vlans communicate with each other
I am setting up three vlans in a cisco router with the following configurations.
Vlan 10
Subnet: 192.168.1.0/24
Netmask: 255.255.255.0
Gateway: 192.168.1.1
Vlan 20
Subnet: 192.168.2.0/24
Netmask: ...
4
votes
3answers
99 views
+50
Win 2003 Server network shares keep becoming “not accessible” with error “the user name could not be found”
We keep finding that on our small company LAN (7 users, 3 servers) that some servers keep becoming "not accessible" for the purposes of file sharing. They display the message "\SERVER is not ...
