Building A Firewall From Scratch Using C?
Jun 30, 2011
I am trying to develop a firewall from scratch in linux environment using C. Actually its more of a Unified Threat Management sysytem .which features to include like antispam, content filtering, vulnerability analyzing,etc.I have exactly 1 year to complete this project which features can be coded completely in time. Actually I have broken the process of development in 4 stages namely :
1. Capture the packet (using libcap)
2. Break the packet into headers and data (using libpcap)
3. Analyze the headers and data and make a decision
4. ACCEPT or DROP the packet
Its the third step that will depend on the features which are included in the project. I plan to code using the UNIX Socket API.
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Jul 10, 2011
I have decided build an open source firewall in linux environment. I have exactly one year to complete this project. The firewall will be a stateful packet filtering firewall working at network, transport and application layers. I would also be provided log analysis features. What I want to know is whether this is a good enough project or put in other words, is it a worthwhile project to undertake?
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Aug 19, 2012
I just upgraded an ASA-5510 from 7.0 to 8.4.4-1 and theres a lot of stuff in it I don't recognize that I never added, mostly because of new network objects, nat commands, and other migration stuff. Its been awhile since I've configured the ASA and I think I'd like to start from scratch and clean it up a bit because theres so many lines for so little that I really need.
I have a 5510 assigned an IP address on the outside interface with 3 inside interfaces and below are the only requirements I need.
Network-A (192.168.1.0/24)
- incoming ssh port 2202 goes to node 192.168.1.2
- incoming ssh port 2203 goes to node 192.168.1.3
- handle incoming https (443) requests
- handle incoming www (80) requests
- cannot see Network-B or Network-C
Network-B (10.0.0.0/16)
- ssh to nodes on Network-A
- incoming ssh port 22 goes to node 10.0.0.20
Network-C (192.168.2.0/24)
- ssh to nodes on Network-A
- incoming ssh port 2210 goes to node 192.168.2.2
ASA-5510
- sends logging to syslog node 192.168.1.3 on Network-A
- there are DNS and NTP servers located outside
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May 30, 2012
I had my network running seamlessly for years, I set it up using a guide from a magazine and had both wired and wireless working A1 and originally it was all win xp pro, 2 desktops and a laptop but got a macbook pro and got that using printer, sharing fies etc. All no problem and it was all easy peasy BUT I have mucked up big time and I think it was because I downloaded some system cleaning software, advanced care, toolwiz and pc pitstop but I was not paying attention and I am sure I clicked a few buttons I should not have done. Result disaster, no longer can share files or print etc.ll I want to do is reset everything and start afresh but how do I do that? I use a netgear router with norton security on main desktop. I have a wii, an xbox, apple tv running as well along with 2 desktops, a laptop and a macbook pro. Tried a few things but nothing worked, when I click on network places I get a list of shared folders but end location shows internet! I have to use netgear switch boxes as well but should not have caused the problem.
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Feb 25, 2013
I'm trying to configure the 1130AG from scratch but I'm not having any luck. I tried using the IPSU utility and entered the MAC address but it errors, "The device does not answer". I have connected it to a network so it can get an IP from DHCP but it doesn't respond. And when it boots up from factory reset there is no SSID broadcast for me to connect to. I have tried connecting through the Ethernet port and the Console port to my computer but no luck.
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Nov 25, 2012
Today the power was fallen out in our area and the rv042g was turned off.After the power was back I was checking the router because some trafic didn't came through.Then I saw that all the services were messed up and also all the firewall rules were wrong.the lines were still there but it all was setup as [all 0-0].
After trying to restore a backup it gave me the same, even after resetting the router with the reset button for 30 seconds and doing a restore it didn't work.So I had to reconfigure the router from scratch.This services thing gives me a real pain in the *** because in a previous topic I also have mentioned that something is wrong with the services.
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May 19, 2012
Our home situation is: We have 3 Mac computers, 2 PC's (all home/office use) and loads of phones and other equipment. Each computer stores files independently, there is peer-to-peer wireless sharing (through the OS) but no true central file sharing.Our existing network situation is: We have O2 Broadband but don't use the O2 equipment. We use a Netgear ADSL2+ modem (delivering 5/6-7meg) connected to a Time Capsule that offers us home backup for our Mac computers and also acts as our wireless router. We broadcast in dual-band 802.11b/g and 802.11n simultaneously (as there are a range of systems that need different bands). We then use 2 Apple AirPort Express access points around the house to extend and amplify the signal - although these can sometimes be temperamental.
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Sep 13, 2011
We are about to install a new VoIP system (Allworx, which I did not select) and need to set up a new VLAN with QOS quickly for my SG 300 and SG 200 switches. I have the default VLAN1 at 10.0.0.0/24 and will be setting up VLAN10 at 10.1.0.0/24 for voice. There are a few other VLANS on the switches as well. I really don’t get the particulars of using a Voice VLAN vs. Smartport, but is one better than the other for this and what would be some good default settings to start with. I have command line and VLAN experience; I just haven’t set up a VLAN for voice from scratch.
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Jul 26, 2012
I'm trying to access the web setup page and I'm being asked for the user name and password. I have the password from the initial setup written down but apparently didn't also record the (changed) user name. It's not "admin" (tried that - and just leaving it blank - already).
Is there any way to recover the correct user name short of resetting the router and setting it up again from scratch?
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Apr 24, 2012
I have in one building a computer which has a real ip using and i want to connect to that building not via teamviewer or bomgar i wish to use VPN, how do i configure it? And why it is better using VPN?
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Jan 16, 2013
Alright, so I have a Dell xps 12 running windows 8.On my school's campus, there are two wifi options. One is secure with a login, the other is unsecured but with a Web login. Normally I connect to the secure one and have no problem.
However, in one building I've encountered issues connecting. My computer will pick up the signal for both options (and says there is strong signal) , then try to connect to the secure one. It will say "connection is taking longer than usual" and then fail to connect, then say no networks available. I tried resetting the network adapters and it picks up the signal again for a moment, try to connect, and then same problem again.
I can see other people in the room connected to the Internet with no issue. My phone also connects with no problems, and has full signal. I have no idea why my computer won't connect.
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Mar 25, 2013
I have a 4g home system from verizon in my house with a wireless roughter all works. Are printers are on the network. I have run a cat5 underground eithernet cable to a poll barn that is about 200 feet from my house. (the house network will not reach that far). My wife wants her barn to be wi fi (she does not want to plug in to the wall of the barn. I was told I need a Hub. but i am not sure what i need.The idea is she could print to the printer in the house or in the barn so i want all to be on one network.
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May 10, 2012
This lab teaches the application performance of two different networkarchitectures: Daisy Chain and Collapsed Backbone Network. The bookshows a collapsed backbone data network in which there is a core switch inthe basement equipment room. The core switch is linked directly to aworkgroup switch on each floor. Another option is to link the switches in adaisy chain. In this approach, the basement core switch is linked directly tothe first floor switch, the first floor switch is linked directly to the second floorswitch, and so forth.This lab shows the application latency introduced by connecting buildingswitches in different ways.
OverviewOperations building has 10 floors, each havingmany users connected to a 10Base-T workgroup switch in the telecommunications closet. The users share an Oracle server and seven fileand print servers in the basement.In Scenario 1, the switches on each floor are daisy chained to the core switchin the basement. We will see that this daisy chain approach introduces highapplication latency to users on the highest floor.In Scenario 2, the daisy chain topology is retained, but the core switch ismoved to the fifth floor. We will see that this reduces latency on the highestfloor but increases it on the bottom floor.In Scenario 3, the core switch is kept in the basement, but ollapsedbackbonetopology is used, in which the core switch in the basement is linked directly to the workgroup switch on each floor.
Several users are connected to a switch on each of the 10 floors. The share an Oracle server and 7 File, Print, and Email servers in the basement.The users on different floors are running a 2 Tier Oracle application. We willstudy the performance of this application.And showed me the error message in pictures (3) I asked the doctor and she told me to change the Switch name (located in the red box in picture) but still error constant I think the error is due to the type of Switch (core switch) or the type of link between the (core switch) and (7 File Print & Email Ervers)
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Mar 25, 2012
I have to propose/design a network system. It has 350 computer terminals/workstations out of which 300 of them are divided into two separate networks while the other 50 are to be on another network. So I assume I'd need 3 networks (or LANs) I guess (all connected ofcourse)So far I've inferred it needs a mail server, a file server, a print server, a DHCP server to assign IP addresses (C class and private ones ofcourse) and a web proxy server. Also I thought a fast Ethernet LAN network might be ideal here but I'm not quite sure on that (nor have I ascertained what sort of topology or hardware to use).
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Jan 26, 2012
I need to generate an ODBC connection to the upm Datasource on LMS 4.1 running on Win2K8. I have successfully built connections to cmf, ipm and rmeng, however UPM keeps failing saying that the Database is not found.
Here are my settings.
Driver = CiscoWorks Embedded Database
ODBC Tab - Data source name = upm
ODBC Tab - Description = Device Performance
Login Tab - Supply user ID and Password is selcted
Login Tab - User ID = lmsdatafeed (i have tried DBA as well)
Login Tab - Password = set using the password I estabplished with the dbaccess.pl and dbpasswd.pl scripts
Database.Server name = upmEng
Network.TCP/IP = HOST=<lms server ip>;DOBROADCAST=NO;ServerPort= 43800
I validated the server port using netstat -a -b -o and matching up the PID with the UPMDBEngine process shown in the LMS Manage Processes window.Windows firewalls on the remote machine and the LMS server are off.
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Feb 3, 2011
I have a cradlepoint ctr350 router. I have a steel building garage abou 75 ft. away from where the router is stationed. I have no problem getting a good signal at the doorstep of the steel building, but once inside I have nothing. What would be the best way for me to get wifi inside of the steel building without having to run a hard line?
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Apr 9, 2012
I'm looking into building a server for Minecraft and Ventrilo and have some questions.Should I build from scratch?If so, what parts are most important? Will I be able to run both things on one server?
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Sep 30, 2012
I have Windows 7 with an Intel Centrino Advanced-N 6200 Network Adapter. It can be picky about what routers it connects to but usually it stops being stubborn after a few minutes. Now it won't connect to my building's internet (while my other computer and devices can). My laptop can access any other wifi and internet. Sometimes it can connect to the WIFI but gets no internet and sometimes I cannot connect to the WiFi at all.
1. Sometimes I'm able to connect to router and just not have internet. Sometimes I can't connect at all.
2. I deleted network profile multiple times. Made no difference.
3. Disabled network adapter and re-enabled - Didn't work
4. Updated Net Adapt driver. - Nope
5. Anytime I connect to router the security is set incorrectly to WEP. Troubleshooting tells me to adjust this which I did to WPA2-Personal. Still still couldn't access internet.
6. Tried to ipconfig /renew and ipconfig /release in cmd but says "no operation can be performed on wireless network connection while it has its media disconnected" - so nope
7. Tried a se[erate USB network adapter - No difference. This actually surprised me, I figured it must be my Intel 6200 but alas it isn't.
My biggest hurdle is I cannot access the router. I have to figure this out on my laptop and I have no Ethernet chord ability either. Every forum post I read about wifi issues people always tinker with their router and it fixes it.
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Apr 8, 2011
designing a wireless network for an apartment complex. The complex is shaped like like an rectangle, fairly small, maybe 100 feet on the ends and 300 feet long on the sides. There are 130 people that we are assuming may have about 3 devices each that they will connect to the wireless network, potentially simultaneously, as this is in a college environment. We have plenty of bandwidth and down/up speed. We are running 30 megabit down and 10 up. I am planning on having a router with two access points centrally located in an apartment and extending the network out with antennas in each direction from the access points with Omni directional antennas. The Access points that I am planning on using are Cisco WAP200 with maybe a Linksys router, as the router should not have more than 10 connections on it. I need something that will not crash after 10-15 users connect to it because it jams up from overload.
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Jul 8, 2012
have coax and 2 cat 6 cables to 8 tv's and want to view a presentation at all 8 tv'spower point to all
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Mar 9, 2011
I am a novice to networking. I have a Internet Modem in the basement and two floors of computers. Each floor has its own wired ethernet network that has one wire in the middle of the network reaching down to the basement. The whole building wants to share the internet connection.What devices do you suggest for the basement and for each "hub" on the other floors?Originally we planned to put a router in the basement and share a wifi signal and put an ethernet switch on each floor. But the wifi in the basement has less range than placing the wifi on the top floor. I was contemplating puting a wired router in the basement and a wireless router on the top floor. Will that work?If not we could have wireless routers on each floor, but will they cause interference with each other?Can one be set in the basement to operate on one channel, while the other set on the top floor to operate on another channel?
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Aug 13, 2012
I am in the process to route two buildings together. Both building have the same network setup. 2 Core Switches 4506-E Chassis having glbp for layer 3 redundency on about 20 vlan in each building with default intervlan routing in place.Below is a simple sketch of how these are connected. Blue lines are still not connected...
What I need is to setup routing onto the blue fibre links so that networks from building 1 can reach networks on building to and vias versa. I would also need to implement some sort of redundency since I have to fibre links between the 2 building.
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Jan 18, 2013
I wish to build a test rig in my office that will act as 2 separate geographic locations with a router at each location connecting to a make believe MPLS kind of network. I then wish for these sites to communicate with each other but obviously be on separate IP ranges .I know each site would have a router and I assume that there ideally should be 2 corresponding (provider) routers on the MPLS network. What I do not know is how the the routers at each site should connect physically to its partner router at the MPLS and also how the two MPLS routers would connect together. For example, if I wanted to later scale up to have 4 geographical sites how would the 4 MPLS routers connect together (using a switch?)?
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Aug 27, 2011
I have a cluster of three layer three switches. Is it possible to build just one IPsec/GRE tunnel to the entire switch cluster or will I have to build an independent tunnel for each switch? I'm pretty sure you can't terminate GRE to an HSRP address, and I think that's the only way to build routing redundancy into a switch cluster.
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Jan 14, 2013
We had 2 laptops and a pc working through a router with no internet problems. My wife's Toshiba laptop had other problems so IT guy at the college where I teach did a clean install of XP and checked the machine in his office, including internet. No problem. Brought machine home and no internet connection. My laptop works fine on wife's cable to the router. Wife's Toshiba has wireless but cannot establish connection with wire.Another tech guy who lives above us took the laptop up to his place - no connection. Back in the office (different building)- connection. The IT men are baffled. Me too.
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May 19, 2011
I am doing some work for my church, but we can't afford getting "business" internet in the church building, $200/month.. but we can afford the residential package.. only problem is that "the man" lol, has to put it in the house at the back end of the property, so there is about 200' of clear line of sight between the main building and this house. We are going to put a software based voip pbx in the house to convert the analog tel. lines in to the network, and we were looking at the url.. but I thought we could go with 2 wifi n access points, and 2 14dbi panel antennas, and save a couple hundred bucks..
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Apr 11, 2013
After some searching I see many people using power injectors or switches that supploy PoE. I am building a lab for the CCNA Wireless and currently have an old Cisco 3550 PoE switch and a 2106 Controller that I got at a steal of a price. My question is, The 1142 can use the 15.4 Inline Power from the 3550 even though it is not the 802.11af standard correct? If it doesn't then I will need to order a power brick.
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Sep 9, 2012
Have two desk top pc's in metal building office they are operating by way of DSL modem my provider is Century Link. I purchased a WRT 54Gl linksys wireless router hoping I would be able to get a WIFI signal to my house. I have no live phone lines in my home just the one in my metal building , how can I get a signal through the metal building to my home in order to use wifi on my Ipod and Iphone . Keep in mind I am 200 ft from my home and have a wooden shop and another metal building to go through to get to my home.
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Apr 11, 2011
I need WIFI inside a giant steel Quanset hut. There is a good signal right outside. Is there a way to do this with one device? I was wondering if I could put one of the antennas of a WRT54G through a hole to the outside and then set it in repeater mode. Theory being it would use the outside antenna to pickup the signal and the inside antenna to broadcast.
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May 2, 2012
We are leasing an office space from a building that has it's own network center. This center can be used by each office/company to either house their own networking solutions or utilize their internet access if you plan only to use cloud servers or NAS servers. Our company (4 employees) is using this network center only for internet access with all of our data stored and accessed in our cloud service.We would like to access the internet wirelessly, which building does not provide. We were given one port and shared the link through the use of a switch. So my questions is would an access point add wireless connectivity without any information (ISP?) provided by the network center? I am not sure yet if we will be purchasing a router/AP or device made for to be used as an AP.
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Apr 26, 2011
How to setup a WIFI Network in a large campus building.
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Oct 29, 2012
I've never been very good with networking, and this is my first post to these forums, but essentially, what I would like to do is build a wireless network throughout my house, and fortunately it is a new build and I have already had hard-wires installed to the first floor and basement, with the primary connection point being my office on the 2nd floor.What do I need to do, hardware wise, to have a single wireless network throughout the house instead of 3 different wireless routers or something like that?
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Oct 14, 2011
I'm doing a college project and looking to triangulate a position where someone is standing in a building using information from at least three Wi-Fi access points. The building has computer labs that I can use. It also has just one Wi-fi signal. I want to know how I can turn one or two of the computers into a Wi-Fi access point that I can detect on my smartphone and differentiate it from the Wi-Fi signal that is currently in the building.Is there something that I can attach to a computer lab computer with possibly USB that will set up a Wi-Fi access point?or if I wanted, could I bring in a laptop and attach something to it in order to set up a Wi-Fi access point?In both situations, I want to use the Wi-Fi connection that is already in the building to create ' hotspots' that I can use so that I can get information from each.
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