0
votes
0answers
6 views

Make PREROUTING IPTables rule only target incoming requests

I've almost got this rule doing what I need, but I cannot figure out how to only target incoming requests. -A PREROUTING -p tcp -m tcp --dport 80 -m comment --comment "redirect traffic to backend ...
0
votes
0answers
10 views

Open ports for Age of empires in ubuntu router using iptables

The purpose of this question is to learn how to correctly use iptables. As I am currently living in the dormitories in the University and I am using a small netbook as a router to provide wifi in my ...
0
votes
1answer
7 views

Set block time with iptables

I have the following rules in ufw, for iptables: -A ufw-user-input -p tcp --dport 80 -m state --state NEW -m recent --set -A ufw-user-input -p tcp --dport 80 -m state --state NEW -m recent --update ...
0
votes
0answers
33 views

No internet through OpenVPN

I am having trouble with my OpenVPN setup. I have a Linode box with an OpenVPN server installed on it and I managed to get Tunnelblick to establish a vpn connection from my mac. I followed this guide ...
0
votes
1answer
30 views

Configure iptables firewall to allow DHCP, DNS, HTTP, SMTP, FTP, IMAP, POP, and Squid ports – deny all other services.

Configure iptables firewall to allow DHCP, DNS, HTTP, SMTP, FTP, IMAP, POP, and Squid ports – deny all other services. 1 pc for router ( place firewall) 1 pc for server ( place web,dhcp,ftp,etc)
0
votes
1answer
34 views

Difference between iptables default policy to `DROP` and inserting a seperate policy in input chain to DROP all connections

I'm trying to DROP all incoming connections to my server, except from particular networks. At the same time I want to keep all outgoing connections from my server to external network (any network over ...
0
votes
4answers
43 views

IPtables keeps resetting rules and blocking almost everything

Every time I reset IPtables, the rules keep coming back in about 10 minutes, blocking everything besides port 22 and 80. When I do a "iptables-save", I see this I can't find out where it's coming ...
1
vote
1answer
54 views

Most secure way to have IPtables auto-loaded using Debian / Linux

I'd like to know the safest way to load iptables using Debian. Of course, I can use a script that uses iptables-restore : #!/bin/sh iptables-restore < /etc/firewall.conf but : 1) where is the ...
0
votes
0answers
20 views

Output port redirect with firewalld?

I'm used to iptables and I can't find a way to do this with firewalld. I need to redirect the output traffic of one port back inside in the same port, basically this: iptables -t nat -A OUTPUT -p tcp ...
0
votes
1answer
32 views

How to permanently disable firewall in Red Hat Linux

I have followed the below steps to disable the firewall in Linux. After reboot, again firewall is enabled. How to disable firewall permanently? Login as the root user. Next enter the following three ...
0
votes
0answers
13 views

Block all outgoing ports from iptables.

I have a windows xp machine running specific application which can be access by single port (27500). there is nothing else i want to access on this machine. If i block all outgoing ports from this ...
1
vote
1answer
21 views

Open ports in Ubuntu 13.10 server

Im setting up a realtime gameserver fps-game, and then i need to configure ports. Just to mention, i will setup multiple servers for this game on the same ip address, which means i must open multiple ...
0
votes
1answer
25 views

CentOS - ipTables

I have some questions about ipTables. Is it possible to open all ports between 2000 and 6000 and then have 2245, 5435,5434 closed? Is it possible to open some ports from a ip address? Eg. The only ...
0
votes
0answers
64 views

How to correctly configure iptables on a laptop?

I have run these commands (tried switching the order too) because I want to set up a firewall on my laptop so that nobody can connect to it (except of course in response to a connection I've made): ...
2
votes
1answer
53 views

IPSet with IP6Tables ERROR

Can someone please solve my headache and tell me how to fix this? [root@www ~]# ip6tables -I INPUT -m set --match-set blacklist6 src -J DROP ip6tables v1.4.7: Couldn't load match ...
1
vote
1answer
61 views

Iptables rules to only whitelist SIP providers

I have an Asterisk box sitting behind an ADSL router/modem. There are no other services on the Asterisk box, just telephony. I am getting a lot of traffic which I think are SIP probes. I've ...
0
votes
1answer
48 views

Redirect ports with iptables

I need to do redirect port 443 on all interfaces to 8080 on one interface using iptables on a box with 2 NICs. I also need to block pretty much anything else on those interfaces. Here is my iptables ...
0
votes
3answers
39 views

outgoing ssh fails from only one machine on lan to outside network

I have multiple servers in my LAN (which I'll refer to as Box1), and they are all able to make outgoing SSH connections, except one that stopped recently, which I'll refer to as Box2 (actually, I'm ...
0
votes
0answers
66 views

iptables error “FIX ME! implement getprotobyname() bionic/libc/bionic/stubs.c”

When I do this rule, the error shows up iptables -A INPUT -p tcp -m tcp -m multiport ! --dports 80,443 -j DROP I've also found some solutions. getprotobyname() just converts protocol names like tcp ...
0
votes
1answer
129 views

Asterisk server firewall script allows 2-way audio from incoming calls, but not on outgoing?

I'm running an Asterisk PBX on a virtual machine directly connected to the Internet and I really want to prevent script kiddies, l33t h4x0rz and actual hackers access to my server. The basic way I ...
0
votes
1answer
199 views

Block All Traffic and Allow from Defined IP only in IPTABLES

I want to create a gateway firewall for my network . I want to block all the internal traffic on gateway and allow it from two computers only . On gateway --> eth0 is network card in gateway PC ...
0
votes
1answer
41 views

iptables: Is it dangerous to filter by source port?

I would like to run a stateless firewall setup and I currently have the following rules: #Do not track any packet *raw :PREROUTING ACCEPT [0:0] -A PREROUTING -j NOTRACK COMMIT #Actual firewall rules ...
0
votes
1answer
111 views

iptables --append FORWARD required for routing between NIC alias IPs?

I have an ubuntu box with a single NIC. In order to bind a number of services (like apache, dnsmasq, etc), I have bound them to different alias's (e.g. eth0:0, etc), some of which are on completely ...
0
votes
1answer
23 views

Firewall rule for local, interactive users?

I want to add a firewall rule that applies to a local interactive user. The intention is to clamp down the box, and only allow web and mail related connections, and update service connections. On ...
0
votes
0answers
34 views

How should I configure my Tor-dedicated firewall for optimum security?

I'm setting up a Tor-based isolating proxy using the 'Anonymizing Middlebox' iptables rules specified here: https://trac.torproject.org/projects/tor/wiki/doc/TransparentProxy i.e. iptables -t nat -A ...
0
votes
1answer
123 views

How do I fix these iptables?

I am trying to setup my networks firewall, and am having trouble because i keep getting kicked out of SSH because of mistakes. Here's what I currently have: # Custom Rules iptables -F iptables -X ...
0
votes
2answers
36 views

Why are these iptable rules keeping me from browsing the internet? (allowing 80,443,53)

This is for my home machine. Here are the rules: Chain INPUT (policy ACCEPT 0 packets, 0 bytes) num pkts bytes target prot opt in out source destination 1 ...
0
votes
1answer
46 views

Ports in Linux vs Windows

I'm studying for a security class. I know that ports in Linux are tied to a process. So if I wanted to close/shutdown a port, I'd end the process that's using it. So if I'm in Windows, what's ...
1
vote
1answer
591 views

iptables blocking all traffic even with ports opened

Simple as I can put it: I can't access my servers with iptables enabled, with default rules. Need to disable iptables to get access. Trying to find the cause. Only difference in setup type is layer3 ...
1
vote
0answers
126 views

Conntrack/NAT's port mapping for a specific port breaks whenever that port's service is shutdown for too long. How can I fix this?

Linux Gentoo 3.13.6-hardened-r3 #1 SMP Sat Apr 12 09:17:25 EDT 2014 x86_64 Intel(R) Core(TM)2 CPU 6300 @ 1.86GHz GenuineIntel GNU/Linux hardened with grsecurity and selinux with a strict policy in ...
0
votes
0answers
382 views

configure iptables to block all(as much as possible) bittorrent traffic

good day all This is my current iptables setup Generated by iptables-save v1.4.7 on Wed Apr 9 13:50:31 2014 *filter :INPUT DROP [0:0] :FORWARD DROP [0:0] :OUTPUT ACCEPT [0:0] :LOGDROP - ...
0
votes
1answer
105 views

IPtables preventing outgoing packets

I am trying to setup firewall rules on a RHEL webserver, so that my webserver can serve up web pages and at the same time download remote files using curl/wget. Problem I am experiencing is I can only ...
0
votes
0answers
77 views

Display port numbers and port names

How do I display both port numbers and port names at the same time? I can display the forward port numbers (i.e. 22, 25, 1000, 443, 80) using the following: [root@michaels ~]# iptables -L -n Chain ...
0
votes
1answer
59 views

why iptables is accepting all in INPUT?

As we can see in this, which is the default iptables on fedora 20 $ iptables -L INPUT --line-number Chain INPUT (policy ACCEPT) num target prot opt source destination 1 ...
0
votes
2answers
137 views

Is Iptables blocking outgoing ssh connections?

I have been trying to do pulls from github and it keeps hanging. My iptables rules have no rules which block outgoing traffic but I cannot connect to github using either ssh or http. I can't even ...
0
votes
1answer
1k views

Forwarding all incoming traffic on eth0 to go to eth1

I am trying to setup my raspberry pi to sit between my router and my modem. I'm basically trying to set it up as an intercepting proxy so that all web traffic goes through the proxy. I have the ...
1
vote
1answer
222 views

bind/named not working on UDP from external

This one is weird. I've set this up a long while ago, on a centos5. From what I remember, it used to work. For some time now, it's not. I've just been informed so no clue what changed when that made ...
0
votes
1answer
247 views

How do I block every connection except vpn and ssh without endangering the state of my vps?

I have some vps space but I get alot of scans based on what I see in iftop. I tried some iptables stuff but it gets tiring and useless to put all the ips that I see in the logs. I am wondering about ...
0
votes
1answer
184 views

UFW default rules… where are they?

In the tutorial on UFW here https://help.ubuntu.com/community/UFW it says that UFW uses the default rules if enabled and not configured. I checked the folder: /etc/ufw/ and the files I found ...
1
vote
1answer
133 views

iptables detects clients behind NAT?

I'm setting up a server that I want to protect from DoS attacks, by setting a limit using iptables: iptables -A INPUT -p tcp --dport 80 -m limit --limit 25/minute --limit-burst 100 -j ACCEPT (default ...
0
votes
1answer
95 views

how to restore iptables after iptables -F?

I used iptables -F on my machine, and what can I do to recover the iptables into the default without rebooting my machine? I restarted the iptables service and it failed, and I can't find iptables ...
1
vote
1answer
182 views

Iptables limit user access time and mac

I am trying to create an iptable chain to kick my daughter off her ipad during the night. With the mac only filter I can block access but when I add time it no longer works. Does anyone see an issue ...
0
votes
0answers
237 views

Dropping Packets with Openvswitch Openflowcontrol

I am trying to setup some Flows with ovs-ofctl to block all unwanted incoming packets for a VM. The commands I use are: ovs-ofctl add-flow xenbr0 "priority=65000, table=0, tcp, dl_src=*, nw_src=*, ...
0
votes
1answer
248 views

Iptables filtering and NAT with secondary IP address

I have two IP addresses on my physical eth interface. Lets say 192.168.10.7 (eth0:0) and 192.168.0.7 (eth0). So it works. But I use application, working on the only one of this addresses on port ...
1
vote
1answer
162 views

With iptables only allow certain outbound ports

Okay, I'm running a router with shibby tomato (linux based) v1.28-115 and have a bridge network setup (br1) that consists of a guest wifi. I want to only allow access to specific outbound ports... ...
0
votes
1answer
101 views

Will using iptables DROP target cause TCP CLOSE_WAIT that never completes?

I have some simple rules to block certain IP blocks used frequently by hackers/spammers, e.g.: iptables -A INPUT -s 173.208.250.0/24 -j DROP But, I noticed that apache hangs after a couple of days ...
0
votes
1answer
331 views

iptables stupid error (iptables -A INPUT -j ACCEPT)

[root@router ~]# iptables -A INPUT -j ACCEPT iptables: No chain/target/match by that name. How is that possible? I recompiled the kernel (3.11.8) and updated iptables to 1.4.16. The strage thing is ...
0
votes
1answer
36 views

List rules using iptables in a customized way

How to list the iptables rules in a customized way? Like: target protocol portnumber src dest the order could be changed but I dont want the name of protocols, just number (like 80 instead of http) ...
0
votes
1answer
284 views

Understanding how dnat works in iptables

I'm running 3 virtual machines with Fedora 19. The machine B is set up with two networks adapters and provides que channel between machine A and machine C. The machine A IP is set to 192.168.1.3 and ...
0
votes
1answer
280 views

Redirect PROXY traffic to test box using IPTABLES

Marked this as answered. I'm going to pass on trying to get this to work. It was only for testing. I'm currently using a proxy server (squid) that's listening on port 8080. Users' browsers are ...