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Web Server behind proxy (IPtables problem)
by Varun(Red Hat Certified) 20 May '03

20 May '03

I am preparing a webserver which will work behind a proxy. For this I am using IPtables. The Internal proxy address is 192.168.0.12 The External proxy address is 203.199.111.24 The Webserver address is 192.168.0.14 The code for iptables is given below. My problem is that the website is working when I access it from the internal network despite the fact that there is no DNS for any machines except the proxy. But when I access it from putside the network there is no reply /* Code in iptables */ PROXY_EXTERNAL=203.199.111.24 PROXY_INTERNAL=192.168.0.12 WEB_ADDR=192.168.0.14 /sbin/iptables -t nat -A PREROUTING --dst $PROXY_INTERNAL -p tcp --dport 21 -j DNAT --to-destination $WEB_ADDR:21 /sbin/iptables -t nat -A PREROUTING --dst $PROXY_INTERNAL -p udp --dport 21 -j DNAT --to-destination $WEB_ADDR:21 /sbin/iptables -t nat -A PREROUTING --dst $PROXY_INTERNAL -p tcp --dport 20 -j DNAT --to-destination $WEB_ADDR:20 /sbin/iptables -t nat -A PREROUTING --dst $PROXY_INTERNAL -p udp --dport 20 -j DNAT --to-destination $WEB_ADDR:20 /sbin/iptables -t nat -A PREROUTING --dst $PROXY_EXTERNAL -p tcp --dport 21 -j DNAT --to-destination $WEB_ADDR:21 /sbin/iptables -t nat -A PREROUTING --dst $PROXY_EXTERNAL -p udp --dport 21 -j DNAT --to-destination $WEB_ADDR:21 /sbin/iptables -t nat -A PREROUTING --dst $PROXY_EXTERNAL -p tcp --dport 20 -j DNAT --to-destination $WEB_ADDR:20 /sbin/iptables -t nat -A PREROUTING --dst $PROXY_EXTERNAL -p udp --dport 20 -j DNAT --to-destination $WEB_ADDR:20 /sbin/iptables -t nat -A POSTROUTING -p tcp --dst $PROXY_INTERNAL --dport 20 -j SNAT --to-source $WEB_ADDR:20 /sbin/iptables -t nat -A POSTROUTING -p udp --dst $PROXY_INTERNAL --dport 20 -j SNAT --to-source $WEB_ADDR:20 /sbin/iptables -t nat -A POSTROUTING -p tcp --dst $PROXY_INTERNAL --dport 21 -j SNAT --to-source $WEB_ADDR:21 /sbin/iptables -t nat -A POSTROUTING -p udp --dst $PROXY_INTERNAL --dport 21 -j SNAT --to-source $WEB_ADDR:21 /sbin/iptables -t nat -A POSTROUTING -p tcp --dst $PROXY_EXTERNAL --dport 20 -j SNAT --to-source $WEB_ADDR:20 /sbin/iptables -t nat -A POSTROUTING -p udp --dst $PROXY_EXTERNAL --dport 20 -j SNAT --to-source $WEB_ADDR:20 /sbin/iptables -t nat -A POSTROUTING -p tcp --dst $PROXY_EXTERNAL --dport 21 -j SNAT --to-source $WEB_ADDR:21 /sbin/iptables -t nat -A POSTROUTING -p udp --dst $PROXY_EXTERNAL --dport 21 -j SNAT --to-source $WEB_ADDR:21 /sbin/iptables -t nat -A OUTPUT --dst $PROXY_INTERNAL -p tcp --dport 20 -j DNAT --to-destination $WEB_ADDR:20 /sbin/iptables -t nat -A OUTPUT --dst $PROXY_INTERNAL -p udp --dport 20 -j DNAT --to-destination $WEB_ADDR:20 /sbin/iptables -t nat -A OUTPUT --dst $PROXY_INTERNAL -p tcp --dport 20 -j DNAT --to-destination $WEB_ADDR:21 /sbin/iptables -t nat -A OUTPUT --dst $PROXY_INTERNAL -p udp --dport 21 -j DNAT --to-destination $WEB_ADDR:21 /sbin/iptables -t nat -A OUTPUT --dst $PROXY_EXTERNAL -p tcp --dport 20 -j DNAT --to-destination $WEB_ADDR:20 /sbin/iptables -t nat -A OUTPUT --dst $PROXY_EXTERNAL -p udp --dport 20 -j DNAT --to-destination $WEB_ADDR:20 /sbin/iptables -t nat -A OUTPUT --dst $PROXY_EXTERNAL -p tcp --dport 21 -j DNAT --to-destination $WEB_ADDR:21 /sbin/iptables -t nat -A OUTPUT --dst $PROXY_EXTERNAL -p udp --dport 21 -j DNAT --to-destination $WEB_ADDR:21 ===== Linux is user-friendly, it is just picky who its friends are If GNU/Linux doesn't have the solution, you have the wrong problem mailto: varunop(a)yahoo.com website: http://varunop.blogspot.com Unix is very simple, Only it takes a genius to simplify it __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com

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How to ftp through the Proxy.
by Vinod Bhaskar 20 May '03

20 May '03

Hi friends, I have a DSL (DISHNET) connection and I had set up a proxy server (Jana) in the machine which the DSL line is connected. Now for the browsing there is no problem from other machines which are in LAN. This I had done it by re-directing the broswer by puting the IP address of the proxy server. Now I want to do ftp from my machine using ncftp through the proxy server to our web location www.xyz.com from my machine. I want to do command line operations like ncftpget and ncftpput, which had set in crontab. How to configure my machine to do the same. Please guide me. Regrds, Vinod.

3 2

[Announce] libyahoo2 version 0.7.0 released
by Philip S Tellis 20 May '03

20 May '03

Version 0.7 of libyahoo2 has just been released. Get it from http://libyahoo2.sourceforge.net/ This release includes major feature enhancements, hence the bump in minor version number. New features include: - Webcam support - viewing and broadcasting - Yahoo Chatrooms Improved features: - All calls to connect can now be asynchronous, ie, they can return immediately and make a call to the registered callback function when the connect completes. This will improve response on slow links. (If anyone knows how to do asynchronouse DNS lookups (single-threaded app), please let me know). Also bugfixes and some internal changes. The API has changed, so please read the README and the two primary header files - yahoo2.h and yahoo2_callbacks.h As usual, report bugs on the website. Philip

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Microsoft Licences UNIX OS from SCO
by Amish Munshi 20 May '03

20 May '03

Greetings, Refer to page 17 ot Times of India. It mentions about MIcrosoft Licensing UNIX os from SCO. Bye. -- Amish K. Munshi In GNU we trust.

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Matrix Reloaded Nmap/ssh crc32 Picture
by Pranav Joshi 19 May '03

19 May '03

--- ranjeet(a)nttindia.com wrote: > > Hello. > > Trinity actually used nmap to portscan a computer > and then launches a > program to attempt exploiting SSHv1 CRC32 > Finally Hollywood is coming out of the stupid concept flash based hacking.. here's the actual picture from the movie LINK http://www.geocities.com/merciless_messiah/nmap-matrix2log.jpg Happy sploiting pranav __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com

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Re [ILUG-BOM] Confusion... Internet Speed
by Abhijeet D Mhatre 19 May '03

19 May '03

Hi, >I am confused about internet speeds and download speeds. >I guess (please correct) a 56 KBPs modem allows a maximum inflow(&outflow!) >of 56 KiloBits ps of data between 2 computers. >But still most(or all?) ISPs in Mumbai offer download speeds(the thing that >u see in the browser downloader or a download manager) is only 5KBPs. >So when we here about Broadband Internet of 1MBPs or 128 KBPs...what are the >actual download speeds? >Why dont all the people refer to actual download speed rather than the max >transfer speeds while referring to their connection? >Please Help! >Thanking in advance, >Hrushikesh Tilak. V90 Modems allow 56 Kbps which is 7KBps bps = bits per sec Bps = bytes per sec The browser usually displays speed in bytes per sec which is about 2-5 KBps usually Actual download speed is not a constant and varies with the no of users logged in. So it cant be mentioned. Acually some sort of statistical quantity should be mentioned. -- Regards Abhijeet D Mhatre Address: 2/19 Shivanand society, Playground cross road, Vileparle (East), Mumbai 400057 Tel: 91-22-26148990/26155144 Email: abhijeetmhatre(a)gmx.net

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Confusion... Internet Speeds.
by Hrushikesh Tilak 19 May '03

19 May '03

Hi, I am confused about internet speeds and download speeds. I guess (please correct) a 56 KBPs modem allows a maximum inflow(&outflow!) of 56 KiloBits ps of data between 2 computers. But still most(or all?) ISPs in Mumbai offer download speeds(the thing that u see in the browser downloader or a download manager) is only 5KBPs. So when we here about Broadband Internet of 1MBPs or 128 KBPs...what are the actual download speeds? Why dont all the people refer to actual download speeds rather than the max transfer speeds while referring to their connection? Please Help! Thanking in advance, Hrushikesh Tilak. _________________________________________________________________ Win a PC. Every 15 days! http://server1.msn.co.in/sp03/hclbeanstalktour/index.asp Just take this quiz.

4 3

Commercial - Contract - Mumbai
by Shilpi K. Kedia 19 May '03

19 May '03

Hi, I am looking for a subject matter expert on the topic Sendmail. The person should be well versed with the configuring and installation and troubleshooting for sendmail. The person would be required to work with us for a few hours a week and would have to check the accuracy of the content that is written by the writers. Please get in touch with me if you are interested in this opportunity. Regards Shilpi K. Kedia Net Systems Solutions Tel : 91-22-56926874/75 Mobile : 9820504608 Email : shilpi.k(a)n-syst.com Website: http://www.n-syst.com

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Microsoft to license Unix code
by Sthitaprajna 19 May '03

19 May '03

http://news.com.com/2100-1016_3-1007528.html Hilarious?

3 2

Starcom Software expertise in LINUX Server.
by Ajay Sharma 18 May '03

18 May '03

Dear all, We are a five year old software company based at India specialised into: * Network infrastructure setup, management and consultancy and security and system integrity. * Network infrastructure support and managed operations services. * Web application development and web infrastructure setup. * Business process design and application design . We are launching a Product called MANUS (Manager of a Network Unix Server).It is a Comphrensive software solution which allows system administrator to handle the integrated management of a network of servers across the enterprise using a single web-based console. MANUS manages all common network services includes file & print,email,web proxy services,Usenet News(NNTP),address book directories(LDAP),and many more.For more information you can visit http://manus.starcomsoftware.com Brief features of Network Monitoring:- a)Monitor capacity utilisation of key resources eg.lease lines,server CPU loads etc., and tackle capacity planning in a scientific manner with quantitative data. b)Monitor the health of key network resources in real time,and raise alarms when attributes fall outside acceptable boundaries,eg.traffic on a leased line crosses 90% of capacity c)Get daily, weekly and monthly reports,consolidated and pre-user,about usage of the key services. Partial List of our well known Clients are as follows: i) National Stock Exchange of India Ltd ii) The National Securities Depository of India Ltd iii)Mahindra British Telecom Ltd iv) A Petrochemicals major in the Private sector v) Zodiac group of Garments exporters vi) Homeindia, India's online retailing trend-setter vii)The Indian Express Newspaper groups viii) ICICI ix) S.Kumar's Online Ltd,nation-wide e-commerce venture x) Amarchand and Mangaldas and suresh A.Shroff and company,India's most reputed law firm. pls find enclosed our company profile along with our vital accomplishments. Pls reply me for any requirement. Regards, Ajay Sharma. Starcom Software Pvt Ltd.

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