Networking :: Server To Block All Traffic But US Only Traffic?

Mar 15, 2011

I wanted to tell my server to block all traffic but US only traffic. So i followed this guide:[URL].. Now I know, it's the best way to help prevent hackers/crackers (doesn't matter to me what they are called. I just have to stop them). My server only deals with US clients anyways so might as well just start right there for my server's security before getting into the brute force and injection preventions. So I got it all done compiled everything moved to the proper directory. I then started to setup my iptables. Like so

Code: iptables -F INPUT
iptables -F OUTPUT
iptables -I INPUT 1 -s *.*.*.* -p tcp --dport 22 -j ACCEPT
iptables -I INPUT 2 -s *.*.*.* -p tcp -j ACCEPT


After seeing that i went digging in the code and figured it was something todo with memory allocation.

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CentOS 5 Networking :: Configure Firewall - Allow And Forward All Traffic On Eth0 And Block All Traffic On Eth1 Except Ssh Ping

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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Server :: PPTP Traffic - Gre Traffic Is Being Generated During The Browsing / Reduce Traffic

Sep 27, 2009

Recently I notice that when I'm connected to an vpn server (pptpd) and I'm using it as a default gateway my download and upload speed decreases almost to the half of the usual speed. I made a test using iptables in order to count how much GRE packets are generated (except the real traffic itself) in that way:

iptables -I INPUT -p gre -j ACCEPT
iptables -I OUTPUT -p gre -j ACCEPT

iptables -I FORWARD -s -j ACCEPT
iptables -I FORWARD -d -j ACCEPT
The first 2 rules match all GRE packets between the pptpd server and client, and the next rules - the traffic between the server and the client.

When I turn the counters to zero and begin to generate traffic (to browse, to download etc.) I see that the GRE packets are even more than these in the FORWARD chain.

So, my question is first of all is my test correct and is it true that so much gre traffic is being generated during the browsing (it becames clear that the traffic is double than if the pptpd wasn't used as a gateway) and if yes - can that traffic be reduced?

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Networking :: Block All Incoming Mail Traffic Except Certain Addresses?

Jan 12, 2009

assist me in using the iptables firewall to block all incoming mail traffic (SMTP port 25) except that of a certain IP(s)? the situation is that we have a server that we only want to receive mail from a particular sender.

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Ubuntu Networking :: Bridging Firewall - How To Block Incoming Traffic

May 2, 2010

I have a ubuntu computer set up as bridge between gateway and lan, with the lan connected to eth0 and gateway on eth1.

I'm trying to get it to basically block everything incoming except for the ports i specify, but also allow outgoing traffic. I've found, tried, modified som examples i found on the web, but still it wont block incoming traffic (ie, im still able to reach my webserver)

These are the rules, and i can't figure out why it wont block:

iptables -F
iptables -X
iptables -I INPUT -i eth1 -j DROP


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Ubuntu Networking :: Iptables: Block Incoming And Allow Outgoing Traffic

Jan 6, 2011

I need to configure iptables to block incoming traffic (except specific ports), but allows all outgoing traffic.

I am able to block incoming traffic, but doing so also prevents outgoing traffic (tested by telnet [URL] 80)

The following was used:

iptables -A INPUT -p tcp --dport ssh -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -I INPUT 1 -i lo -j ACCEPT
iptables -A INPUT -j DROP

Also, even allowing NOT SYN requests still prevents outgoing traffic.

iptables -I INPUT 1 -p tcp ! --syn -j ACCEPT

Another point:

# modinfo ipt_state
modinfo: could not open /lib/modules/2.6.18-028stab070.14/modules.dep

How to install ipt_state module on ubuntu?

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Ubuntu :: Internet Traffic Flow Monitor - Track Traffic Of Each Device

Apr 27, 2010

We have something on our network that is reaking havoc with our content filter. I am trying to track it down, but so far I have been unsuccessful. We have approximately 500 devices in 100+ different locations spread across 9 states. Looking at each computer is not really feasible.

I need a machine that can sit in between our network and our internet connection and graphically monitor in real time and logs how much traffic each device is sending and receiving. It would need to sit inline so it has to have two nics and be able to pass traffic. The machine also needs to be transparent. Reconfiguration of our routers or workstations is not an option.

I have used ethereal and wireshark before. Ethereal may be a viable option, but wireshark seems to provide lots of information, but no practical way to make use of it. how to set up the box to be a transparent device on the network that will allow internet bound traffic to flow (freely)?

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Software :: Looking To Block All Non-Tor Traffic

Jan 20, 2010

I'm trying to set up my laptop to be as anonymous as possible with Tor. I want to block all non-Tor traffic from leaving the computer. I was looking to find an firewall that filters by PID, so only Tor can send traffic out. Does something like this exist?

I also considered setting up some kind of TUN/TAP interface that tunneled through Tor's SOCKS proxy, but couldn't find anything that does this.

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Security :: Block Traffic Initiated From Computers In The DMZ?

Apr 3, 2009

I have computers in the DMZ ( .. How to block traffic initiated from computers in the DMZ?

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Security :: Opensuse Susefirewall 2 And My Own Rules - Block Ougoing Traffic Except Some Apps

May 1, 2010

I have trouble with opensuse susefirewall 2 and my own rules. since i have installed a suspicious download manager, i detect outgoing traffic in the monitor and i want to block ougoing traffic except some apps like firefox, jinchess ...

1) I had to modify FW_CUSTOMRULES="" with FW_CUSTOMRULES="/etc/sysconfig/scripts/SuSEfirewall2-custom" in /etc/sysconfig/SuSefirewall2

2) I had to add my own rules in /etc/sysconfig/scripts/SuSEfirewall2-custom in the appropriate hook

3) I don't know if rules are good.. they seem to work because for example jinchess can't access his server with the DROP rule until i add the ACCEPT rule BUT in fact the download manager still access internet and amarok too when it searches for songs lyrics ! i have discovered it's because the others apps use port 80

I give here the file /etc/sysconfig/scripts/SuSEfirewall2-custom

How to to make firefox use another specified port ? i wanted to use privoxy with tor but it doesn't work .. is there input/output controler on linux (something like zonealarm on XP) ? the trouble is that all outgoing traffic is permitted by default!

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Networking :: SSH Tunnel - Record Traffic Through Server

May 20, 2010

I'm currently tunnelling to my Ubuntu pc at home from my laptop in order to bypass my schools false-positive prone filter. Is there a way to record traffic that both comes to and is delivered by my pc?

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Networking :: Configure Network Traffic To Go Through Home Server?

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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Networking :: AWstats For Viewing / Visualizing Web Traffic To Server?

Apr 25, 2011

I like AWstats for viewing/visualizing web traffic to my server. However, I am in a situation where I would like to visualize ALL traffic to/from a network, in a way similar to AWstats. That is to say, Free and Visual. The program will have to be linux/http/java based as it will run on a linux server off of a Network Tap.

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Networking :: UPnP Not Working After Traffic Forwarding Through Server

Dec 30, 2010

I have just recently switched my setup to have my server be in the middle of traffic and act as my new router while making my other routers just switches. However, after doing this I can no longer access my UPnP devices. They used to show up in my router but I am assuming either there is an issue with my iptables rules or that some how having my server run the dhcp and dns routing is messing with UPnP.

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Networking :: Routing Incoming Traffic To NAT'ed VM On A Hired Dedicated Server?

May 21, 2010

I have set up a Virtual machine on a dedicated server from 1and1. I hoped to use a bridge to give the vm direct access to the internet but 1and1 do mac filtering and so the only option is to use NAT.

I used Virtual Machine Manager on my Ubuntu 10.04 machine at home to install Debain Lenny on the vm on the server using KVM and all went well. I put it on a virtual network and i can access it from the host and i can access the internet from the guest using NAT that libvirt set-up.

I bought another ip address from 1and1 with the hope of forwarding packets to the new ip address to the guest vm.

I have tried all sorts of routing rules using iptables without any success.

my virtual network is on virbr1 the guest ip is my external network device is ip say on eth0 with the secondary ip say on eth0:1

Here are the latest rules i tried:


iptables -t nat -A PREROUTING -d -i eth0 -j DNAT --to-destination
iptables -t nat -A POSTROUTING -s -o eth0 -j SNAT --to-source
iptables -A FORWARD -p tcp -i eth0 -o virbr1 -d -m state --state NEW -j ACCEPT
iptables -A FORWARD -t filter -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT


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Networking :: IPTables - Redirecting Web Traffic To Single Transparent Proxy Server

Mar 25, 2010

I am new to iptables. We have two Squid proxy servers running in "non-transparent mode" ( and Currently users have to configure the proxy server they want to use by configuring them in their browsers. Recently I saw an example for redirecting web traffic to a single transparent proxy server.

-A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128
-A PREROUTING -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 3128

Can anyone modify this rule to accommodate my current setup of two proxy servers running in non-transparent mode. i.e Redirect web traffic to the ip range.

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CentOS 5 Networking :: Check If Clamav Is Scanning HTTP Traffic Squid Proxy Server?

May 21, 2011

I'm trying to setup a Centos 5.6 Squid Proxy Server with Content Filtering & Antivirus Scanning Incoming HTTP Traffic from the Internet

I then proceeded to setup an configure the Proxy Server, i was able to test and confirm that Squid and Dansguardian Content Filter is working, however i dont know if Clamav is scanning HTTP traffic before it hits the client/server. Is there a way i can check if the Antivirus scanning is working.. is there some log file or real world test i can i can do to confirm that Clamav is scanning incoming traffic or even blocking potential viruses ??

Anyone who has squid proxy server with Clamav configured and its working can share there settings/setup with me and how they tested it ??

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Server :: Monitoring Traffic With Cacti?

Mar 5, 2010

I am using CentOS 5.4 and did a yum install of cacti. I installed all the necessay packages, like net-snmp, php net snmp and all that. Everything else works but I can't for the life figure out how to monitor traffic on eth0. I do not have any SNMP Interface Statistics or alike in either the Associated Graph Templates or Associated Data Queries.

Heres the output of "snmpwalk localhost -c public -v2c" , SNMPv2-MIB::sysDescr.0 = STRING: Linux 2.6.18-164.6.1.el5xen #1 SMP Tue Nov 3 17:53:47 EST 2009 i686
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (7515443) 20:52:34.43


I am trying to monitor the interfaces on the local computer only.

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Server :: Redirect All Traffic To A Dynamic IP?

Oct 7, 2010

I was wondering what the best way of redirecting all traffic, not just http traffic, from my hosted web server on hostmonster (with a domain name) to my home server.... I wondered if it would be possible to do it with a simple script running on the hosted web server?? Also is there a way of getting round having all the ports open on the hosted web server that I want to use on my home server??

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Networking :: How To Route Traffic To The Vpn

May 11, 2010

I've succesfullly connected to my vpn with kvpnc, but none of my traffic is going through the vpn! I dont know how to route traffic to the vpn. for instance, when I go to it still has my previous ip.

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Networking :: Isolate VPN Traffic From LAN?

Jul 11, 2010

I have a comcast business network adapter that has a 4 port switch. It also handles nat 1 to 1 translation for static IPs (That's just how they do it, there is no other choice).

In port 1, I have a cat6 that brings traffic to and from my linux machines, allows me to vpn, ssh, a mail server, etc. Everything here is fine.

In port 2, I have a netgear router that is setup with a point to point VPN for a client.

Here are the issues:

1. Machines that are connected to the netgear vpn router/switch can access machines on my network - I don't want this.

2. I can't access the machines connected to his lan from my lan - I need this to administer his machines somehow. Even if I have to VPN to the concentrator and do it like that.

Here is the network structure.

Internet <-> -> switch with 10.10.10.x machines
-> internal vpn IP


The external network for the VPN is 10.10.10.x and the internal is 10.10.20.x. So, a machine with IP can get to 10.10.10.X and I don't want that. I guessing it's doing this because technically, I'm 'from the internet' on 10.10.10.x and the vpn machines are going 'out to the internet'. Is there a way to have this:

vpn -> gateway traffic only?

I have a cisco 1811w at my disposal if I need to use it; however, I'm all thumbs when it comes to cisco IOS and networking in general.

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Networking :: Inspect SSL Traffic On LAN

Dec 1, 2010

I'm trying to inspect network traffic from my iPhone / iPad / Kindle / other wi-fi only consumer electronic device. To do this I man-in-the-middle myself (connect laptop to LAN via wire, create wireless Ad-hoc network, bridge the connections, then connect my device to the ad-hoc wi-fi network) and use Wireshark to watch the traffic.

In the past this has been adequate for my needs (just wanted to watch and see what potentially private info was being leaked about me / see that banking / amazon / etc apps were going over SSL). Now I've noticed that applications are almost all using SSL (which is great) but they are way to active for my taste. I'd like to use these apps but want to know what's happening in the background. I know that corporations dead-end SSL connections at their proxys to inspect the traffic and then re-establish the connection on behalf of the user for the trip across the internet. While I find the corporate use a bit distasteful, I think this is exactly what I'd need to do to myself. Any suggestions for how to do so or other ideas on how to get the packets in the clear?

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Networking :: Traffic Control ?

Oct 19, 2010

How are packets treated that do not match any of the filters?

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Networking :: Video Traffic In NS2?

Feb 23, 2011

I want to simulate video traffic in ns2.31 .I have added mpeg4_traffic patch in Contributed codes in NS2 web site . I receive segmentation fault error ,when I debug code I got a lot of error ,I don't know what to do ? does no one know how should transmit video in ns2 ??

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Debian :: Apache Traffic Server In Squeeze?

Jul 12, 2010

any plans to include (or not include) Apache Traffic Server in Squeeze?

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General :: Best Server Monitoring (Traffic ) Tool?

Oct 25, 2010

Which is best server monitoring (Traffic ) tool ?

Can you provide some form of monitoring on this server or recommend any server-side applications that could monitor the status, in high detail, including traffic, etc?

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Server :: No Internet Traffic Through The PPTP VPN Connection?

Feb 21, 2011

everything works fine, clients can connect to the vpn server with no problems and they can ping local machines! but no internet access through the vpn connection unless i uncheck the default gateway option on my client machine which is not what i want. I want my clients to get my server's ip address. my server is behind a router (router's ip : | server's local ip: so i used localip & remoteip in pptpd.conf. it think there is something wrong with routing or firewall rules, because it seems that the DNS resolution works .. when i try to browse a website my browser says "Waiting for" and it stays on that stage forever ! the funny part is that works fine (don't know how).

p.s :
* I have already opened the port in on my router. I even tried it locally to make sure that the router is not the problem here. * already added ms-dns / ms-dns to pptpd-options. (found another guide that suggested to do this, before adding these two lines even dns resolution was not working.)

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Server :: Squid3 Deny All Traffic (Ignoring ACL)

Feb 18, 2010

I have a squid3 on a debian lenny box but cannot get access to any site.

If i remove the http_access deny all works, but i just want those ip to get access to squid

My squid.conf

intranet:/etc/squid3# cat squid.conf
acl manager proto cache_object
acl localhost src
acl to_localhost dst
#acl all src


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CentOS 5 Server :: Gateway Server To Redirect Traffic For Http/smpt/pop3

Apr 6, 2010

I have been beating my head for the last few weeks on this problem, (although I have been taking the wrong approach, it seems).

I need a gateway to direct web traffic to three separate servers/domains. I have been trying to do this with both a dns server and , (seperatly), apache server to forward requests. The dns server was a no go, and <i can only get apache to redirect http and ftp.

After Googling this ALOT, I believe that what I need is a gateway server to redirect my traffic to the 3 different servers. I have been reading about using using nat and iptables for this and was wondering if anyone had any advice/suggestions on this. The other thought I had was to use something like pfSense to create the gateway, but I am still reading the documentation, and I am unsure if this approach will work.

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Ubuntu Networking :: Limit VPN Traffic ?

Apr 2, 2010

I have ubuntu server with PPTP on it. I need to limit single connection speed for ip 1 mbit/s, and mounthly traffic limit to 5 GB. How i can do this my task. I try to find somthing with ip tables, but can't find how to creat mounthly limits.PPTP do not have this option, maybe is some other, not hard for configure VPN server? Maybe someone make this task with iptables, and can give commands for limiting? Ofcorse VPN program with integrated accaunts and limits will be better.

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