Networking :: Spurious Network Traffic From ATT U-Verse Router?
Aug 9, 2010
In my "computer room" I have an ATT U-Verse TV decoder box and my computer connected to a Netgear Switch. The third port on the switch connects to the ATT router. I've just noticed that when I power on the U-Verse TV box I start getting a lot (200-250 KiB/s) of received packets on my Debian Lenny machine as shown in the System Monitor app. I don't show any outgoing traffic in response. That explains why the lights on the switch are blinking at the same rate for both devices. So, what, if anything, is this telling me? Is this normal, or is the ATT router spamming my Linux machine for some reason? Is this a potential problem?
Added: Or is this just telling me that the NetGear FS-105 is not actually an ethernet switch?
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Sep 4, 2009
I wanted to know if i can install mrtg on a client computer in network and measure the network's router traffic.i know that it can be installed on the server.
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Apr 22, 2011
I am using Debian 5 and I have some networking experience, however I want to learn to do this the best way possible. I have a Debian box with two nics and I want to connect that to a switch and use my Debian box as a router basically, as well as having a firewall setup within that too.
Should I use iptables to set up nat or the route command or what? I just want to know the group of tools to use in order to set up my network. Network diagram: Internet <------> Debian Box <----> switch <----> hosts I found some guides but they are for linux 2.4 and i'm not sure if they are right.
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Jan 8, 2010
is it possible to see the router traffic using a remote system? can those packet headers b modified for marking purpose?
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Jul 27, 2010
I have a desktop, a laptop, & a wireless router. The router, unfortunately, doesn't support dd-wrt, tomato, etc firmware, but I would still like to prioritize voip/web browsing over bulk Internet traffic. I hope I can offload the router's missing QoS to my desktop.
Is it possible to have the laptop's connection go from the wall to the router to the desktop, where the desktop could perform the QoS of tomato, then continue on to the laptop? I'm a bit of a noob to networking (subnets?) but do well enough following good instructions.
As for the program that would do the QoS... Don't some Linux machines basically work as super-powered routers for businesses? So there must be some package but couldn't find one. The closest I got was wondershaper but it only shapes traffic for the computer on which it's installed; it might form part of the solution but falls short on its own. other devices should be able to access the Internet normally if the desktop is turned off, & work with other devices like a (jailbroken) iPod Touch.
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Jun 10, 2009
I am looking for a solution for our LAN traffic monitoring and would like to use some opensource linux application. I have a linux box with two NIC cards and what I thought is the following: Our setup is as follows. Internet comes in through the router and into the firewall. From the firewall it goes into our switch and distributed among the workstations.
I have no access to the router or the firewall as they are centrally configured. I would like to place a device into the loop through which I could monitor the LAN traffic.
Can I put a linux box between the firewall and the switch and have all packets going through registered and logged? I have a proxy server (non transparent) and that captures some but not all. I would like to get all packets registered without interfering with the LAN etc.
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Oct 3, 2009
I'm a new Fedora 11 user and have an ATT U-verse setup. Where can I find help on how to get the box on my wireless network?
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Apr 24, 2010
I'm having trouble getting my network set up the way that I want it/had it. You see, when I first set up my network, I just had my cable modem going directly to my standard wired router (A D-Link DI-604), which had DHCP,and was connected to all of the computers on my network. I had one switch hooked up to one of the ports of the router, but this was a regular switch, and it would not try to assign IP addresses, it would just pass through the DHCP info as I wanted.
Now however, my network setup has changed. My room mate and I both got laptops, and we decided that we wanted to have wireless access so we didn't have to constantly plug in to the router.
Now my network is set up like this: The modem is hooked up to the router(DI-604), which is hooked up on the LAN side to our computers, our switch (which is hooked up to 3 more computers), and to a wireless router card (A Gigabyte GN-BC01).
The wireless router card has two jacks for ethernet. One for WAN, and one for LAN. The LAN side we have plugged only into the computer in which the card is installed.
Now the problem is this: The wireless router card comes with DHCP by default, and it's assigning addresses to the laptops and to the computer hat it's in, and worse, the IP addresses are on a different subnet than that of the main dlink router. The Main (dlink) router assigns addresses from 192.168.0.1 (itself) to 192.168.0.254, while the wireless router card assigns addresses from 192.168.1.1 to 192.168.1.254 (itself).
Because of this, I cannot access services on the wireless network from my wired network or vice versa. The first thing I tried was setting the card to assign addresses from 192.168.0.12 to 192.168.0.253, however it just said "internal error" when I tried to do this. I decided that this may be because it sees that it was being assigned an address on it's WAN side on the same subnet. So the next thing I tried was disabling DHCP and setting the "LAN IP Address" to 192.168.0.12, hoping that the DHCP would just go through the card, like a switch. I would have set the LAN IP address to be assigned by DHCP, but this was not an option, so I decided that'd be the best thing to set it to.
Once again however, setting the LAN ip address to an address on the same subnet as that of the IP assigned to it's WAN side caused it to report an "internal error". I verified that this was the issue by setting the LAN address to several other private IP addresses to test (I.E. 10.0.0.1, 192.168.3.1, 192.168.5.12).
My question then really is: How do I set up both routers so that I can access services and computers from each network from the other network. Should I set them with different subnets and set the gateway on the wireless network to the main router? To the wireless router card? Should I put them on the same subnet? Will it know how to communicate?
Here is a link to (picture) my network diagram. Network Diagram
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Jun 20, 2009
I have changed over to AT&T U-verse. I need help getting my sendmail able to send out.
From AT&T website
Incoming mail port number: 995
(make sure secure connection (SSL) is checked)
Outgoing mail port number: 465
(make sure secure connection (SSL) is checked)
how to setup sendmail to use SSL , userid,password and port 465 ?
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Jan 16, 2011
I noticed a huge data transfer to my computer. I wasn't downloading anything big, I have just opened Firefox, Thunderbird etc. It stopped after a minute but I'd like to know, what that was - this wasn't the first time something like this happened. I promptly started Wireshark and captured a few packets, all of them look like this:
[code]...
I tried to look at [URL]... but that webpage does not work. what the traffic might be caused by? Couldn't anyone hacked my pc?
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Jan 20, 2011
Is there an easy way to monitor network traffic? I want to make sure my kids are surfing safe...
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Jan 31, 2010
I need software that measure the QoS of network traffic , Any recommend program?
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Feb 8, 2010
I am manually capturing and injecting Ethernet traffic (using lib_net/lib_pcap libraries) for an application. At the moment , both capturing and injecting are done on the same physical interface (e.g. eth0). The problem is that all the traffic that I inject, are captured again by my application causing an unwanted feedback of injected traffic. This caused that I had to implement traffic filtering when capturing traffic, which is consuming resources and eventually will become too complicated to support.
I have tried using virtual interfaces to separate the capturing and injecting streams, but that also presented the same problem as all the traffic from eth0 is forwarded to both eth0:1 and eth0:2. If possible I would like both streams to go through 1 physical device, using more PDs will be the last resort. I am also looking at using TUN/TAP devices to try and separate the two streams, maybe writing a user-space program that lies between the physical device and the TUN/TAP devices to do the routing of traffic.
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Jan 31, 2010
I need software that measure the QoS of network traffic , Any recommend program??
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Dec 8, 2008
Via a network traffic monitoring tool I see that my laptop is generating lots of outgoing (EDIT : incoming !!) network traffic. Although no download program is running or any other program of which I know that could be generating this much traffic. Something strange is going on and I need to know how I can find out which program( s ) are generating network traffic.
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Oct 18, 2009
how to configure my network for web traffic.Here is my setup:I have the following virtual machines, (all guest are running on CentOS 5.3);
firewall: Smoothwall 3.0, (hardware, not virtual)
guest # 1: Apache http server
guest # 2: Qmail server
guest # 3: Proftp server
I want all of these services on different machines for security reasons, (mainly the ftp server) how do I route the traffic from the firewall to the different machines? I have been looking at setting up a reverse proxy, however, everything that I have read says that a reverse proxy will not handle the smtp/pop3 traffic. Can I just use a DNS server to route the traffic?
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Sep 27, 2010
what I want to achieve is just to be able to say to who ever is killing our relatively fast connect that they aren't the only person using the network. Everyone just says "I hardly download anything." which is obviously untruthful as normally I can download at 1.5 MB/s but now loading even google.com takes way too long (same with pinging and all other sites). Once I do this, I can determine whether or not I need to call my ISP and do the long 'on hold' dance and "have you tried rebooting the router" BS.
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Apr 4, 2011
I am running Ubuntu 10.10, upgraded a few weeks ago from 10.04. I noted from the system monitor that the system was generating a lot of network traffic, on the order of 10Mbps if the information is correct (using system monitor and iftop). From the process table, it appears that smbd is accumulating a lot of CPU time, which sort of makes sense as I use Samba for printing from a Windows 7 laptop. But the traffic seems to be making a round trip as I just rebooted the system and it reports in about 10 minutes of uptime 1.2GB was send and 1.2GB was received. Laptop is used for work, it is sitting idle for the last 30 minutes (VPN connection, etc); no backup or other interaction with the Ubuntu system.
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Dec 28, 2010
How could I configure Ubuntu to be setup as follows...
Wireless Client ----> Wireless Router ----> Home Server ----> Internet
What is needed to make all of the wireless traffic go to my internet connection port. I will be having two ethernet cables plugged into the system one from the wireless router and one to my internet router.
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Jul 3, 2010
Does anyone know if it is possible to filter/block network traffic between internal hosts on a lan?
Eg. : Linux firewall/router ( 192.168.0.1) - LAN Default G/W - all internal > external traffic gets filtered.
How would you filter tcp/ICMP/UDP traffic from internal host a ( 192.168.0.2 ) to host b ( 192.168.0.3)
All the internal hosts have the linux f/w as the default gateway, and are all on the same /24 subnet.
I would like to know if I can filter traffic between internal hosts.
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May 17, 2010
My problem is that my wireless network traffic sometimes just stop.Like when I tries to update my system, update NetBeans or just download using Uget. I have no clue on what's wrong,Here is my system info:
Laptop model:
Code:
Lenovo R500
[code]....
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Jun 19, 2011
how to redirect network traffic to a new IP address using IPtables. I am using Baffalo router and the rtos used is DD-WRT. Basically, I want it so that any connection going through my router to a specific IP (say, 192.168.11.5) will be redirected to another IP (say, 192.168.11.7) so any outgoing connections made by a program that is attempting to connect to192.168.11.5 will instead connect to 192.168.11.7.
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Oct 29, 2009
is there a utility with which I can get the current traffice towards a given host, for example;
command 87.255.33.32
22000
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Apr 9, 2010
I need to learn how to analyze network traffic for attacks and while finding the attack seems easy in my case I need to identify what hes doing. I will be happy right now if you guys can answer my question. How to identify if an attack has brought the server down? I have packet captures of an attack in progress and I noticed that every now and then the attacker would do something weird and the server would start sending packets with just the RST packet sent in response. Normally I had been seeing the RST ACK flags set or the FIN ACK bits set to terminate a connection. So once again my question is how do I tell if the traffic indicates a server crash?
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Nov 16, 2010
I just got vpnc setup to work with my VPN at work and now I am trying to figure out how to limit the traffic that is routed through the VPN while I'm connected to it. I only want traffic going to the local domain to be routed through the VPN.This is what my vpnc config file looks like:
Code:
IPSec gateway publicdomain.example.com
IPSec ID XXXX
[code]....
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Mar 14, 2010
OS : CentOS 5.3 64bit How to trace incoming and outgoing network traffic for a give user? User 'A' logs in to the system and does various network connectivity As root user need to find what are the outgoing and incoming connection that are related with user 'A'. basically need to check the connection flow. netstat will show ESTABLISHED, LISTEN etc.. need something like tcpdump
Eg:- --user option for tcpdump tcpdump -vv -nn -i eth0 host 10.200.2.1 and tcp dst port 8080 --user A Can someone tell me any tool which can do such thing? Even if it can show the process ID of the client application which is trying to establish network connectivity will do.
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Mar 23, 2010
I am currently setting up a old box to serve as a general, quality router/fileserver that should give me fine control over my network traffic. This router will serve as the bridge between several local users and the Internet, along with quite a few machines.Traffic is expected to be heavy, in the sense of multiple powerusers using the Internet to the fullest, not from one machine doing anything insane like Torrenting. The connection profile will reflects lots of up and down, not necessarily a huge number of persistent connections.Due to security concerns, the need to build an encrypted tunnel between a SoHo LAN and a dedicated server is unescapable. I'm trying to determine whether I can pull this off with a simple SSH tunnel on the box serving as the local router, or if a VPN (either PPTP or L2TP) is a more appropriate solution.Proxying won't work, because not all apps can easily be socksified across the Windows, GNU/Linux, and OSX platforms that the users will need. For this reason, I have to pull this off strictly at the router level.
I'm not all that familiar with the specific details of each protocol's performance as far as their latency, efficiency, overhead, and fault-tolerance are concerned. I'm less concerned with a protocol taking up CPU as I am with useless bytes and latency it might be introducing to the link. I don't know the low-level nitty gritty of how each protocol encapsulates its traffic.If there is an existing package for this, it would be great, but at this point I'm simply trying to figure out which protocol is more appropriate before I begin digging in the wrong direction. The biggest concern, of course, is that the chosen protocol aggressively re-establish sessions should the connection suddenly drop, which will be a concern given the SoHo line I'll have to work with. The actual outbound server is no concern, as it has four cores and a Gbps line.
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Aug 8, 2010
I get all my traffic from my router, as this computer seldom moves. So is there a use for a firewall?I am not sure, because when I scan my IP address with nmap, no matter what the changes I make in the firewall, it is always the same scan...cannot fingerprint OS...and all closed ports.The all closed ports thing only changes when i torrent, then i get a wide open port.
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Sep 29, 2010
I need to set up my centOS computer as a firewall in my home network. Ive got 2 interfaces, eth0 and eth1. I want to allow and forward all traffic on eth0 and block all traffic on eth1 except ssh, ping(icmp) and DNS. How do I do this? Ive tried some editing in /etc/sysconfig/iptables but no luck.
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Sep 14, 2010
I am connected to a network with free traffic inside it and post-paid outer traffic. So I need a way to be able to separately monitor the download traffic from inside and outside the network. All the solutions I`ve found for now offer monitoring of ALL up/down traffic.
So, I want to get separate statistics on these:
1 — 81.89.188.0/23, 217.197.9.0/24
2. — 81.89.186.0/23
3. — 81.89.178.0/23
4. — 81.89.176.0/23
5. — 81.89.180.0/24
9. — 217.197.12.0/24
[Code]...
UPD: I`m connected to the internet through the network`s gate, so all the traffic comes through eth0. I wish to separate traffic incoming from the IPs on top from all other traffic
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