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.
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.
View 1 Replies View RelatedI 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
[Code]...
After seeing that i went digging in the code and figured it was something todo with memory allocation.
I have computers in the DMZ (192.168.1.0/24) .. How to block traffic initiated from computers in the DMZ?
View 3 Replies View Relatedassist 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.
View 1 Replies View RelatedI 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:
Code:
#!/bin/bash
iptables -F
iptables -X
iptables -I INPUT -i eth1 -j DROP
[Code].....
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?
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!
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:
Code:
iptables -I INPUT -p gre -j ACCEPT
iptables -I OUTPUT -p gre -j ACCEPT
iptables -I FORWARD -s 172.16.10.101 -j ACCEPT
iptables -I FORWARD -d 172.16.10.101 -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?
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)?
I have two IP address on my iMac I want to "bridge". I'm not sure what the proper terminology is... here's the situation.
My iMac has a firewire connection to my laptop and an ethernet connection to the rest of my office. My laptop has an ip of 192.168.100.2 (on the firewire interface). My iMac has an IP of 192.168.100.1 on the firewire interface, and two IPs, 10.1.0.6 and 10.1.0.7, on it's ethernet interface.
If I wanted to forward all traffic coming in from 192.168.100.2 on my OS X machine to go out on IP 10.1.0.7, and vice-versa, can this be done? I assume I would use the ipfw command.
Essentially I want to "bridge" the firewire network to the ethernet network so my laptop can see all the machines on the 10.1 network, and all those machines can see my laptop at 10.1.0.7. Is this possible?
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 whatsmyip.com it still has my previous ip.
View 1 Replies View Relatedhere is what i need to do: [url]..... resolves to 209.5.5.5 which is my public IP on the external side of my router. Router is setup to forward (port forwarding) all port 80 based traffic to internal ip 192.168.1.10 which I want that server to lookup the request, and for web1 forward to 192.168.1.101, for web2 to .102 etc....how can i acheive this? What do i need to use?
View 6 Replies View RelatedI 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.
Code:
Internet <-> 10.10.10.1 -> switch with 10.10.10.x machines
|
-> internal vpn IP 10.10.10.50
|
[Code]....
The external network for the VPN is 10.10.10.x and the internal is 10.10.20.x. So, a machine with IP 10.10.20.100 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.
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?
How are packets treated that do not match any of the filters?
View 4 Replies View RelatedI 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 ??
View 14 Replies View Relatedwhat rules I need to use to only allow traffic between 2 interfaces (which are part of a linux bridge) using ebtables?
So let's say I have if0, if1, if2. I want if1 to communicate with if0. I also want if2 to be able to communicate with if0. But I don't want if1 and if2 to communicate with each other.
While I was tweaking 5.3 to get it up to speed on a couple of servers, I used to make some use of IRC 9#centos). Haven't looked at it for a while. Decided to fire it up again tonite, only to find things...have changed. Now there is seems to be 2 channels: #centos and #centos-unregistered. I *was* already registered with nickserv, but that didn't seem to work anymore. Re-registered, but am still seeing no traffic at all. My irc client (chatzilla) suggests there are lots of users 'online', but still - not seeing any traffic at all.
View 5 Replies View RelatedI have a question regarding Traffic Shaping in Linux, Suppose I have a server on the internet (web, email or ftp) and I want to shape outgoing traffic per IP, say 256k for each destination IP. I've seen examples on the internet on how to shape traffic per IP by adding a queue for each IP, and some examples by using u32 hash if I have e.g. a /24 network, but if I have a server and I want to shape the traffic by destination IP, and of course... since it is a server on the internet I can't manually define any IPs of subnets. An example using the tc command?
View 2 Replies View RelatedI need to log outbound (server -> remote) ssh traffic, but am unsure of the best way to do this.
I added this to iptables, but nothing is being written to the logs when I ssh from the server to another system.
iptables -A OUTPUT -m state --state NEW -j LOG --log-uid iptables-save
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.
View 1 Replies View RelatedI have a number of computers on a LAN. There are 3 laptops and 1 desktop, all running windows. I also have a Ubuntu server in the garage which servers up files to all those on the LAN. The server is not visible outside of the LAN for security reasons. Now, I want to track all traffic from any computer in my house that is coming and going in and out from the inter-tubes. I do not want to add this as a service to my current server as (a) it is behind the LAN and (b) I don't want to mess with security issues with that server.
I think I could set up a computer (an extra) which is between the modem and the router with two ethernet cards which would be able to monitor all traffic coming and going. This computer would, obviously, be exposed to all potential attacks as it wouldn't be behind the router's firewall. I'm not sure exactly how that would like or what software to use.
I'm trying to connect to the www.freeopenvpn.com vpn service from my ubuntu 10.04 netbook edition. Installed the parts based on the instruction of the website, then the connection successful (lock icon on the connection area) but.....
the traffic does not go through, ping rejects with some "buffer error", network monitor does not show any data flow on the lan card. after the connection. Was trying it from commandline, and from gui as well. Same result. Can't even navigate to the service start page.
I do not have firewall, using the linksys built in firewall in my router. The same (dual boot) machine and router let the same vpn work under win XP, so the hardware is fine.
I suspect that it is a routing problem. (using dhcp from the modem-router)
Found that the vpn module installed the virtual tun0 interface and set up the routing table automatically.
Code:
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
173.192.86.142 192.168.1.1 255.255.255.255 UGH 0 0 0 eth0
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
[Code]....
I've got 4 or 5 of these TRENDnet USB network adapters ( TU-ET100c ) that I use frequently when I'm configuring firewalls or IPS devices for customers. I use them in combination with VirtualBox to test. They've always worked great until my new laptop I just got, and I put 10.04 on it. Previously I was on 9.x. Sometimes they will give a link light, other times not. And when they do the interface shows that it's up, but I can't get any traffic across the interface.
[code]...
I have access to a VPN I use when having confidential instant messaging sessions. For the purposes of my work, essentially.I'm a command line kind of guy, and like to use Finch (the shell version of Pidgin) for those.However, when I turn on my OpenVPN connection it routes all traffic through the VPN. Web-browsing, IMing, and I can no longer access other machines on my home network.Can I set OpenVPN to only route traffic I ask through that connection (either by port number or application, or some way I haven't thought of), while other traffic flows through my usual home network?Some kind of local proxy perhaps? Or a dd-wrt box set up as a proxy, connected to OpenVPN?I've played around with the GUI environment too (I have a basic GUI I sometimes use on my main machine) and have installed the full desktop 10.10 on a second machine just to see if I can work it out.
View 2 Replies View RelatedMy kind isp had set up a authoratitive dns server that can't be cancelled that points to the wrong ip address. Hence I need to take all the traffic going into server A at the ip address aa.aa.aa.aa and send it all onto server B at ip address bb.bb.bb.bb. After much head scratching, I managed to achieve it as follows:- On the server at ip address A, set up following :-
iptables -t nat -A PREROUTING -d aa.aa.aa.aa -j DNAT --to bb.bb.bb.bb
iptables -t nat -A POSTROUTING -d bb.bb.bb.bb -j MASQUERADE
I have a VPN account and have been running it perfectly on windows without any problems but I deleted my windows OS because I wanted to force myself to learn a Linux OS. I have installed the configuration package through the terminal and have followed this guide exactly
[URL]
The VPN was giving me a no secrets error to start off but I managed to fix and now it connects for about 40seconds but whilst it is connected, the internet is completely useless and I can't get on anything... It then disconnects after 40 seconds saying it has failed.
I installed firestarter to see if I could tweak it there to work but it was beyond me and I could also see from the data being sent that none of it was going through tap0 whilst the VPN was connected..
I have done some research on the net and I am battling to find effective methods in other to bypass those irritating ISP traffic shapers. I have used SSH tunneling to reduce latency (which is my primary goal, i dont care about silly torrents, etc) by about 200ms.
Do you know of any other way that I could improve this latency? When I ping my server in Germany (from South Africa) i get a latency of about 185ms... I was hoping to get online gaming traffic to around about 250ms or even less if possible... Right now its sitting on 550ms WITH SSH tunneling and 800ms without it... (to Blizzard servers)
is it possible to see the router traffic using a remote system? can those packet headers b modified for marking purpose?
View 5 Replies View Related
