Fedora Security :: Iptables Allowing Specific Ip's?
Dec 8, 2009
i've got a few questions about iptables. i know how to set up ip tables to only allow from an ip address or a subnetting ip addresses. question is how do i allow from 2 different networks? would i need to create 2 lines of entry in iptables to the same port? e: allow 10.168.1.1 and 196.168.1.1 on port 22 is there a way to put all that in 1 line or would i need to create to rules for the port? i know i can use the ssh allow or deny but i'd like to stop access even before it gets to the ssh. stop it at the source kinda thing.
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Sep 5, 2010
I've got two virtual machines running, the first VM (VM1) has two network interfaces, one bridged with my real lan, one a private subnet. The second VM (VM2) has one nic, only on the private subnet.
I have VM1 acting as a router for VM2, giving access to my real lan for internet access. The problem I'm having is I cannot get VM1 to forward ports 80 (http) or 222 (ssh) to VM2 from my real lan.
Here is the script I've cobbled together from various (foreshadowing!) locations:
Code:
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Sep 11, 2010
I am using dyndns to keep track of my smartphone's ip address. The idea is to be able to ssh into my home network, protected by an iptables firewall. If I use the command: # iptables -I INPUT 9 -s myname.dyndns.org -p tcp -m tcp --dport 22 -j ACCEPT it updates using the current ip address, but the next time I get an ip address update to my phone and update dyndns to properly provide nslookups, this is not being updated in iptables unless I restart my firewall. Is there a better way to do this?
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Apr 5, 2011
My firewall , wich is an Ubuntu server 10.10 , have 3 interfaces:
eth0(192.168.0.254):linked to the DMZ
eth1(192.168.1.254):linked to the LAN
eth3(212.217.0.1):linked to the Internet
-The DMZ have one web server with a static address (192.168.0.1).
-My LAN address range is (192.168.1.2-192.168.1.100) managed by a DHCP server in the same firwall machine.
There are some of the rules that I need to set up :
-Allow HTTP between the LAN and the internet
-Allow HTTP between the web server in the DMZ, and the internet.
Is there a way to tell the firewall , to redirect all incoming HTTP requests only to the web server in the DMZ ?
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Dec 23, 2010
I'm trying to limit access to port 8443 on our server to 2 specific IP addresses. For some reason, access is still being allowed even though I drop all packets that aren't from the named IP addresses. The default policy is ACCEPT on the INPUT chain and this is how we want to keep it for various reasons I wont get into here. Here's the output from iptables -vnL
[Code]...
Note the actual IP we are using is masked here with 123.123.123.123. Until I can get everything working properly, we're only allowing access from 1 IP instead of 2. We can add the other one once it all works right. I haven't worked with iptables very much. So I'm quite confused about why packets matching the DROP criteria are still being allowed.
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Jul 15, 2010
I want to ask about securing the FTP connection... I have one server that Installed with Redhat Linux Fedora 6.
And now, i want to securing the FTP access, so only the selected IP will be allowed to connect. Do anyone know how to do this?
Another thing is, my server using Webmin 1.3 to manage the server and there not installed / not configured yet with Frox FTP, ProFTPD Server, WU-FTP Server... even there is such thing in my Webmin...
Can i make use one of the three FTP i mention above, and if yes, will it be affecting the current FTP access?
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Jun 4, 2010
I had configured IPSEC/L2Tp on my Centos 5.4 gateway machine .For testing i had disabled firewall and Ipsec is working fine.I am able to connect from client etc...Now i want to allow Ipsec and l2tp throught Firewall.here is my Current Working Firewall.Only Openvpn is allowed and is Redirected.
eth0=XXXSTATICIPXXX
eth1=192.168.1.81
OpenVpn IP Range = 172.24.0.16/4
Ipsec Ip Range = 192.168.1.0/24
[Code].....
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Feb 1, 2009
I have been struggling with this for a very long time now. I have installed Fedora Core 9 on my computer. I have set it up as a caching-nameserver and this is working.
Then I wanted to secure my server with iptables, and I have so far made this script:
# Load the connection tracker kernel module
modprobe ip_conntrack
iptables -F
iptables -P INPUT DROP
iptables -P FORWARD DROP
[Code]....
I can reach the dns server with ping. When trying Nslookup it says that it got SERVFAIL from 127.0.0.1 trying next server, and then it times out.
My resolv.conf file lists:
nameserver 127.0.0.1
nameserver DNS-server
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Dec 14, 2009
Im pulling my hair out trying to get ftp to work through iptables.Im using vsftpd
Table: filter
Chain INPUT (policy DROP)
num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
2 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
[code].....
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Mar 17, 2009
What i wanted to do was block everything from getting in my pc but still be able to surf the web and still use instant messenger.
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May 3, 2009
When I use system-config-firewall, it asks what interfaces to trust. Where does it store that information for iptables (or whatever uses that info)? How iptables knows at what interfaces to use the rules?There is not that kind of information in /etc/sysconf/iptables and iptables-config.
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Dec 19, 2009
Wondering if anyone knows what the range specification is meant to do for the colonHAIN at the top of the iptables file? e.g. what is the 1:76 range mean for :OUTPUT ACCEPT [1:76] ?
# Generated by iptables-save v1.4.1.1 on Sat Dec 19 12:28:00 2009
*filter
:INPUT ACCEPT [0:0]
[code]...
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Jan 28, 2010
I found a behavior of iptables on FC12 to be different and suspect it's broken somehow. Here is what I did
# iptables -F
# iptables -A INPUT -s 127.0.0.1 -p tcp --dport 22 -j ACCEPT
I don't have a shell on FC12 with me to show the output of iptables -L -n but it looks good after above 2 commands. However, after issuing the following third command iptables -L -n gives "wrong" result
# iptables -R INPUT 1 -s 127.0.0.1 -p tcp --dport 22 -j ACCEPT
Namely iptables -L -n gives extra "/0" after 127.0.0.1 in the output I have checked on Ubuntu 9.10 and centos 5.4 and they don't give extra "/0"; iptables is not supposed to do that. Of course, I didn't invent these examples but they are abstracted from actual real life scenerio of trying to build rules on our servers.
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May 15, 2011
i was hoping that someone in here could possibly help me out with my iptables rule set. First here is what i would like iptables to do, i want iptables to deny all packets or traffic from the outside coming in and for output allow the things i need like web and irc etc... Also, i would like iptables to deny access to all services like sendmail and ssh except i would like localhost to have access to everything. What i mean by localhost is that when i run my iptables script it loads fine except when i try ssh from localhost i get this output:ssh -l user localhostssh_exchange_identification: Connection closed by remote hostI know what most of you are thinking, why do i need to ssh into localhost from localhost just open another terminal, well i am getting myself familiar with iptables i want all services logged and blocked but not from localhost. I cant seem to figure out this problem and i have tried several different things. Here is my iptables script, I am hoping that someone out there can tell me what i am doing wrong...
#!/bin/bash
iptables -v -F;
iptables -v -A INPUT -i lo -j ACCEPT;
[code]....
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Feb 2, 2010
Hope you can help me out. I'm trying to setup a "drop-box" on ubuntu 9.10 server with vsftpd. I'm able to login and land in the /home/user directory, however I cannot write anything.
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Feb 23, 2010
If I allow, my server's IP is:
11.11.11.11
If I allow 11.11.11.11, and block 22.22.22.22
22.22.22.22 can't access the server
But if I allow 11.11.11.0/24, and block 22.22.22.22
22.22.22.22 can still access the server!!
Does anyone know why that is?
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Feb 10, 2010
i am learning security and firewalling. i want to know . where a linux firewall is sufficeint and where it is not sufficeint? if you can explain why or give a reference i will be glad. is that security or traffic handling problem? when i should select a cisco product? in tarms of traffic and sceutiry. do you have any good alternative recomendation to Cisco
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Mar 4, 2011
I am using squid on my fedora box as a proxy server.By default the iptables (Firewall) service is on.To allow web pages to my client machines i stop the iptable service.
#service iptables stop
By doing it client computers start browsing.kindly how can I add a rule so that without stoping firewall client compter work fine.my perver IP address is 10.1.80.10
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Dec 13, 2009
I've got two routers, 10.0.0.0/23 and 192.168.2.0/24, which are joined by a Linux box with interfaces eth0 (10.0.0.2) and ra0 (192.168.2.2). I've got masquerading for ra0, and a route to 192.168.2.0/24 on 10.0.0.0's router. I CAN ping hosts on 192.168.2.0 from 10.0.0.0 just fine, but I CANNOT access web pages.Strangely, If I enable masquerading on eth0, and add a route to 192.168.2.0s router to 10.0.0.0, I can ping AND access web pages from 192.168.2.0Here is my current iptables
Code:
*filter
:INPUT ACCEPT [0:0]
[code]...
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Aug 1, 2010
how to allow mount in iptables for specific ip?
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Feb 19, 2010
According to this article -- [URL] there are problems with FireFox security, as a veriety of Zeus is being used by crackers in Europe and China. Allowing for alarmist reporting, this still looks unpleasant. Does anyone have definitive information about how this attack affects the various operating systems?
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Feb 16, 2011
I like to set in iptables to allow access from one host to my server on any ports.
Currently the iptables have been configured to deny all and to allow access only to those I've specified.
Can anyone advice on the command to achieve this?
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Feb 21, 2011
i am relatively new to ubuntu. Just recenty i have not been able to access certain files(for example the history and bookmarks in the firefox folder), download files individually from the internet(music,fonts,etc), recieving an error message
Quote: Originally Posted by firefox error console
Error: [Exception... "Component returned failure code: 0x80520015 (NS_ERROR_FILE_ACCESS_DENIED) [nsIFileOutputStream.init]" nsresult: "0x80520015 (NS_ERROR_FILE_ACCESS_DENIED)" location: "JS frame :: file:///usr/lib/firefox-3.6.13/components/nsSessionStore.js :: sss_writeFile :: line 2944" data: no][code]...
i have sudo priveleges and can install via update manager. i read somewhere that compizfusion might affect access permissions and i do use compiz and emerald at the same time.
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Nov 25, 2010
I use iptables firewall (v1.4.1) installed on FC8. I'm trying to limit the inflow traffic for the port 1723 to certain MAC addresses. To experiment with the mac option, I've written the following iptables rule:
Quote:
iptables -A INPUT -m -mac --mac-source 10:08:08:08:08:10 -j ACCEPT
It didn't work. It gave me this error message:
Quote:
iptables v1.4.1: Couldn't load match `-mac':/usr/local/libexec/xtables/libipt_-mac.so: cannot open shared object file: No such file or directory
Try `iptables -h' or 'iptables --help' for more information. Does that mean the mac module wasn't installed/enabled?
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Jul 23, 2010
How to configure iptables to allow only 22,80,3306 ports for only a dynamic public ip/dyn dns domain name on a ubuntu server?
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Feb 15, 2011
I like to set in iptables to allow access from one host to my server on any ports.Currently the iptables have been configured to deny all and to allow access only to those I've specified.
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Jul 16, 2009
How come FC11 is set by default to reset the IPTables firewall to ACCEPT across the board each restart?
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Jun 1, 2010
Im running a web server on port80, but i want traffic coming from ip 212.333.111.222 on port 80 to be fowarded to port 9020 on the same server that my web server is rinning at that is my sshd port
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Nov 26, 2010
I am unable to restore my iptables from iptables-save after upgrading Fedora. I cannot get iptables-restore to work, and I have resorted to entering rules manually using the GUI.
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Jul 17, 2010
IPtables creates an error during startup as well as when I try to restart it: Here's the output of:
[Code]....
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