Security :: Detect Whether Firewall Service Is Provided By Server Or By ISP?
Sep 16, 2010
I have two servers behind different networks. First network is protected with firewall provided by the router and there is no firewall in the server:
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As you see, there are no difference in nmap output If I check with tcpdump, which packets are sent from 192.168.217.73 and 192.168.13.19(tcpdump -i eth0 src host 192.168.217.73 and tcpdump -i eth0 src host 192.168.13.19 respectively) towards me during nmap scan, there are none. It's understandable, as there should be no reply when port is filtered. Is there somehow possible to detect, whether firewall is active in the server or in the router?
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Sep 7, 2010
I had windows and 8.10 earlier and now have single boot 10.04 !
1.) I can see wireless networks only after I am connected to the router through wired ! I guess its some thing to do with me activating ifup and ifdown, when my wired connection stopped working as i was trying to install wireless drivers.
2.) Even when I see wireless networks, i cannot connect to any of them.
I tried various things for a whole day trying to fix it and i doubt if i screwed up some thing that was running good.
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Jan 20, 2010
I have installed Enterprise Linux Version 5 provided from Oracle
I am able to access Internet using network cable
how can I enable WIFI service ,so that I can use internet without the network cable
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Feb 17, 2010
i recently install openoffice in fedora 12 and error occured the error is : the action could not be completed because the name org.freedesktop.packagekit was not provided by any .service files. what is link to download latest openoffice for my fedora 12,?my laptop model is asus k50in.
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Apr 20, 2011
I was trying to copy a few files to my phone via bluetooth when the file transfer window popped up with the progress bar stating "Connecting" and an error: the name org.openbox.client was not provided by any .service files..
I am using: openSUSE 11.3
Gnome 2.32, Kernel 2.6.38,
obex-data-server 0.4.5-12.2,
[code]....
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May 26, 2010
When I plug in my iPhone to my 10.04 machine, it's recognized. I can always drag music from the iPhone to the Music collection in Rhythmbox, but 9 times out of 10 dragging the other ways gives me this error:
"Error while getting peer-to-peer dbus connection: The name :1.219 was not provided by any .service files"
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Feb 23, 2010
I intend to set up a web site on a dedicated web server in colocation (containing nothing else except the server OS).Is it sufficient to make all files read only and use Apache mod_security or can a firewall offer extra necessary protection?
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Apr 7, 2010
I've read tutorials and put together this IPTables firewall for my LAN fileserver. Appreciate any feedback you may have to offer:
Code:
*filter
# Flushes any current rules
-F
# Sets all default policies to DROP
-P INPUT DROP
-P FORWARD DROP
[Code]...
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Jan 15, 2011
I am trying to consolidate my servers for a small office (less than 50 computers) and need file sharing/crm or erp database/backup/ftp/firewall/vpn etc). I was going to use endian but that seems to want to run on it's own machine. I was going to run endian in Sun's virtualbox. While researching I have found both guarddog and Lutelwall should work within Ubuntu (no virtual machine needed).
1. Is there a reason to use Endian over Lutelwall or Guarddog?
2. Is there any reason NOT to run a firewall within a VM on the server?
3. Should I just scrap the whole idea and run a router flashed with dd-wrt or tomato
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May 9, 2011
Can we use iptables as firewall instead of Juniper firewall
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Jun 6, 2011
I have my own internal bind9 server, for my local domain, and I forward internal requests for public domains to OpenDNS servers. This server is not in a DMZ, but is instead behind an dynamic NAT. I do not accept queries from the public network, only responses. I understand that DNS is primarilly a UDP protocol, so it can't pass through a stateful/nat. without a firewall allow.
I've done a little reading and learned that bind9 does not run 53 <-> 53 anymore (is now >1024 <-> 53), and modified my config so it works like bind4 did, but I am concerned that this makes me less secure. additionally, I'd really rather not have a completely open 53 rule, but it seems that if I constrain 53 traffic to my known forwarders, it interfers with some of my network services like transmission. so, what firewall rules would you guys recommend for recieving forwarded DNS query responses to my server?
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May 30, 2010
I wanted to install TeamViewer (for Linux). I downloaded the RPM, but when I double-clicked on it to start the installation I got the following error: The name org.freedesktop.PackageKit was not provided by any .service files I Googled around for possible solutions but I couldn't find any. Does anyone know how to fix this error and install TeamViewer? I'm using openSUSE 11.2 with GNOME desktop.
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Jul 13, 2010
I can't get my openvpn work if the firewall is on , and I also don't see any option to allow openvpn service in firewall allow service.
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Dec 6, 2009
tell me the default runlevels in the firewall for the netfs service. I messed with it and rather than enable it, I would like to set it back to default.
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Sep 23, 2010
I have a Suse11 box with 2 network cards:
I have squid as a proxy on the Suse box, and with the default firewall I have to enable masquerading to allow clients on the eth3:1-3 to send and receive mail through the Suse box. I found the Suse firewall completely inadequate (all P2P software/connections are allowed once you enable masquerading) and had to install ConfigServer Security & Firewall. In die configuration of csf I could get my way around getting smtp to work for the eth3:1-3 clients, but pop3 connections does not go through the box. I know I need to allow port 110 and 995 to masquerade of NAT (or something) and then the same for port 22
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May 4, 2011
If I use static TCP configuration, (my Linux is Red Hat, but SuSE is quite similar) I define DNS's in file "/etc/resolv.conf" and Default GateWay in file
"/etc/sysconfig/network" (/etc/sysconfig/network/routes undef SuSE).
So, when I want to display those values, I just display the contents of the file. But, if my TCP configuration uses DHCP server ... I dont know the command to display those values. PD.- in straight : I need a command to display the DNS's in effect on a TCP/IP configuration that uses a DHCP server. Also, a command to display Default Gateway would be welcome.
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Apr 26, 2010
when i assign ip manually to a machine it gets ping by server and it also itself pings server but when i chose to use client machine as dhcp , so that it can directly get assigned ip from server, it does not get ip, instead random ip is provided which is out of range specified at server side in /etc/dhcpd.conf file.
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May 31, 2010
I have a network consisting mostly of Windows Vista and 7 clients and an Ubuntu server. The server provides both the DHCP and NTP services through dhcp3-server and openntpd. In my dhcpd.conf, the subnet is declared as follows:
subnet 10.10.10.0 netmask 255.255.255.0 {
range 10.10.10.10 10.10.10.200;
option broadcast-address 10.10.10.255;
option routers 10.10.10.1;
option ntp-servers 10.10.10.1;
The clients don't seem to be using the NTP server though. When I capture the network traffic with Wireshark during the DHCP process, I also see no mention of the NTP option in the DHCP offer message. I am not quite sure if the clients would have to specifically request that option to receive it or if I have to make another configuration to offer the option.
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Feb 22, 2010
Is this possible to record keyboard inputs in a file which will be provided during running a script.? Means suppose there is a script ./instal.sh To run this script, some inputs need to be provided.Is this possible to record these inputs in a file?
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Feb 23, 2011
I tried installing F-prot's linux scanner but it doesn't seem to want to install and I am tired of messing with it.
So I am wondering if I even need it or if there is something else.
I am behind a firewall already with my router if that helps any.
I guess I am having trouble understanding why virus protection is less necessary.
Do people not write viruses for linux systems?
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May 21, 2010
How do we configure to resolve for hostnames when an IP address is provided to the DNS server.
Things I tried
The DNS daemon was started by the resolution failed. Find the logs below
** server can't find 11.127.168.192.in-addr.arpa: NXDOMAIN
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Sep 17, 2010
I am facing a strange problem witht my iptables as there are some firewall entries stored somewhere which is displaying the below firewall entries even after flushing the iptables & when I restart the iptables service then the firewall entries are again shown in my iptables as shown below,
[root@myhome ~]# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
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Feb 13, 2010
i want set up IDS(Intrusion detection system) and Firewall in my home just for learning.. The Goal is learn IDS log and Firewall log..
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Jul 20, 2010
I have Ubuntu running on an old PE server. It is running Virtualbox with an instance of Ubuntu inside. The instance is there to run my honeypot.
The server box IP is192.168.1.10. The Virtualbox is bridged with it's own IP of 192.168.1.200. The honeypot daemon is listening to 192.168.1.201 with arpd.
I set up the UFW with DENY. And then enabled only the ports leading to the honeypot scripts which are abound to IP .201. I then forwarded the ports necessary to run VNC to .200.
Here is the UFW status:
buntu@ubuntu-desktop:/var/lib$ sudo ufw status
Status: active
To Action From
-- ------ ----
192.168.1.201 21/tcp ALLOW 21/tcp
192.168.1.201 4444/tcp ALLOW 4444/tcp
192.168.1.201 5544/tcp ALLOW 5544/tcp
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Mar 7, 2011
Setting up firewall
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Jul 22, 2009
Up until recently, as in a few days ago, I was using Ubuntu and had ufw managing the firewall.It's been "recommended" that iptables itself be used. Where do I do the rules go (as in a file) and how do I call those rules at startup?
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Jan 30, 2010
im currently running fedora 11 on my computer and i have this old firewall called firestarter. firestarter is very outdated but it has better rules for blocking connections like IGMP does any one know how to add filter rules so i can block IGMP trace and other unknown protocols it would be cool
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Feb 14, 2010
at the end of my first in fedora i've seen that there is an integrated firewall. With ubuntu i used iptable but we haven't a internal gui firewall. I was looking for reviews but i couldn't found no about it because beeing new i'd like to know if this firewall is good or if is better to install iptable.
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May 23, 2010
Will I need to actiavte the firewall that comes with Ubuntu since I'm using Transmission?
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Aug 13, 2010
I am new to the Ubuntu/Linix world (less than a week).
I have tried the search, but have had difficulty finding threads on this.
Can someone recommend an excellent firewall to use with Ubuntu?
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