I have proxy running. I have seen LAN machines sending packets by iftop -P -F 192.168.10./24
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How do i set my iptables so that I can only send and recieve http,smtp,ssh,dns,dhcp request in and out of the proxy
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Hi, is it possible to send a request to a http server without using sockets?
View 7 Replies View Relatedi have tried to reconfigure evolution to send and receive e-mail,i am using verizon,i must have put in the wrong information,everything gets stuck in the out box,after trying many times i can not get back to the welcome to evolution to where i can reconfigure it back to where i can get it to work to send and receive and not stuckn the out box,getting a little frustrated,
View 1 Replies View RelatedI can send emails to local accounts but not out to the world. Here are the refrences I used to set things up.
[URL]
I was able to send and receive after the "basic" setup. I added amavis-new and I am pretty sure that it stopped working then. (late nights, lots of changes/tries not 100% sure any more) Went back to basics trying to send a test email from telnet (on the server).
Code:
mail:~# telnet mail.my-server.com 25
Trying 216.240.35.89...
Connected to mail.my-server.com.
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i ve talked to my isp provider and they made sure that all of the fields are set up correctly in evolution mail i can access internet through fire fox update manager works fine But there is a question reguarding my network settings i am useing a wired connection throught eth0 but my isp service provider needs a secured login and i cant insert a password or login in there respective places in the network setup
View 2 Replies View Relatedhow to redirect all client http request to https request in squid
View 1 Replies View RelatedI am trying to send data through a USB port to a printer which can recieve text file. Now to send the data to the printer I am doing echo "Hello World" > /dev/usb/lp0
but the data doesnt seem to be sent to the printer because I have an analyzer to monitor the data sent to the printer. Is there anything else which I need to do
Using netcat, nc(1), craft a valid http/1.1 request for getting http headers (not the html file itself!) for the main index page of www dot aalto dot fi. What request method did you use? Which headers did you need to send to the server? What was the status code for the request? Which headers did the server return? Explain the purpose of each header.
nc -v www dot aalto dot fi 8080
HEAD / HTML/1.1
host: www dot aalto dot fi
And it returns:
200 OK
Content-Length: 858
Content-Type: text/html
Last-Modified: Thu, 02 Sep 2010 12:46:01 GMT
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I really don't know what does it mean. Question 2: Using netcat, nc(1), start a bogus web server listening on the loopback interface port 8080. Verify with netstat(, that the server really is listening where it should be. Direct your browser to the bogus server and capture the User-Agent: header "Direct your browser to the bogus server and capture the User-Agent: header" I don't understand this question.
I had configured sendmail on linux 5.2, Iam using public ip and my domain is registered[linuxforfreshers.info]. I am facing a issue that when I mail with the user sumit@linuxforfreshers.info then I am able to do it. But if somebody tries to send mail to the same user then it bounce backs. I had made the entry of domain in /etc/mail/local-host-name and also I put ok in /etc/mail/access.The mails are working properly with in LAN. But not able to work on WAN only I can send mail but not able to recieve mail.What else I need to do.
View 6 Replies View RelatedI am using KMail Version 1.13.5 and until recently i am no longer able to download or send mail without having to restart the app several times, when i have logged into my webmail, i can see that there is clearly mail there, but kmail doesnt see it. i use pop3 and smtp protocols and they have worked fine until now?
View 4 Replies View RelatedI have a network of 20 machines, all running Ubuntu 10.04.
Each machine has about 200[GB] of data that I'd like to share with all other 19 machines for READ ONLY PURPOSES. The reading should be done at the FASTEST POSSIBLE WAY.
A friend told me to look into setting up HTTP / FTP. Is it indeed the optimal way to share data between the machines (better than NFS)? if so, how do I go about it?
UPDATE: Just to clarify, all I want is to be able (from within machine X) to access one of machine Ys files and LOAD IT INTO MEMORY. all of the files are of uniform size (500 [KB]). Which method is fastest (SAMBA / NFS / HTTP / FTP)?
I want to know that by default do we need to configure SMTP and POP3/IMAP sever for sending and receiving mails in Linux server and client machines or we can directly send and receive mails without configuring these mail servers?
View 2 Replies View RelatedI am sending message from linux to windows system as follows echo "test"|smbclient -M <IP Add>But I am getting "session request failed" message . How can I solve it? <Ip Add> in network and reachable.
View 1 Replies View RelatedI setup a private network from virtual machines and one of the machines is the DHCP server for the group. I want to specify a next-server for the DHCP server but I'm having trouble connecting to any of the machines that I lease IPs to. I'm just trying to do a simple ping/ssh to 10.0.0.252 (a machine with a lease) but it doesn't seem to respond. I'm assuming I need to be able to connect to my next-server but maybe I'm wrong.
View 1 Replies View RelatedWhy firewalls does not allow ICMP echo request packets. Why are pings not allowed to certain systems?
View 1 Replies View RelatedI'm looking for a way how to send an arp request / reply packet using C or C++. I've written an application that can send different crafted packages using jpcap (java), but I'm not a C expert (trying to learn). The reason for this is that I would like to port my java program to C to use it on a less powerful system that can't fully cope with the resource hungry VM
View 3 Replies View RelatedHow to communicate with an SMTP server with telnet, in order to send a mail?
telnet smtp.something.somewhere 53 Trying
10.xxx.xxx.xxx...
Connected to smtp.something.somewhere.
Escape character is '^]'.
And that is as far as I got. What do I have to do after?
What do I have to write after "HELO"?
Is there an linux API I can use to do a http request?Say I want to display URL...throught the API
View 1 Replies View RelatedI've a webserver at 10.10.0.55. Above in the hierarchy are managed network cisco switch / router and ASA firewall (the usual stuff). I also have a mail server at 10.10.0.200. I was told by the network admin that he can't forward port 80 to webserver and port 25 to mail server. Basically he said that it's a one-to-one (external.ip-to-internal.ip) mapping and all traffic, no matter what port it's destined for must go to 10.10.0.55. So, I turn to the wonder that linux is. The webserver is running Centos 5.4. Currently, all packets on port 25 are coming to the webserver. I want to forward all these packets to the email server. Note: the webserver only has one interface: eth0. I turned to web for help and did this in iptables:
Code:
$IPT -A FORWARD -p tcp -s 0/0 -i eth0 -o eth0 -d 10.10.0.200 --dport 25 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
It didn't work. I am assuming that since I only have one interface, a simple rule to the filter table and forward chain will not work.So i use the NAT table and try the following:
Code:
echo 1 > /proc/sys/net/ipv4/ip_forward
$IPT -t nat -A PREROUTING -p tcp -i eth0 --dport 25 -j LOG --log-prefix PortForward: --log-level 7
$IPT -t nat -A PREROUTING -p tcp -i eth0 -d 68.***.26.*** --dport 25 -m state --state NEW,ESTABLISHED,RELATED -j DNAT --to-destination
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First of all, since there is no service/daemon listening on port 25 on the webserver, is it even going to work? Isn't the webserver simply going to discard packets on port 25? I am assuming that packets go through the iptables first, and so iptables should route the packets to the email server, where there is postfix listening on port 25. Am i right? Also, as you can see in the code above, all packets coming on port 25 on the webserver should be logged. But they aren't. In order to troubleshoot, I'd like to at least know that packets are coming into the iptables. But since it's not logging, I can't find out what's wrong.
I would like to find out how I would use both curl and wget to sent an http post to get the hostnames of a few servers. I know am not even given any work of anything I have done, but the reason is that I am really lost, and I do not even know how to start it.
View 4 Replies View Related(Let me first of all state that I am a newbie to any form of programming.) I have been trying to create an IP header + TCP header and send this to another machine on my network.using C)I used the normal stuff: two structures for the headers, a sockaddr_in structure, call to function socket with SOCK_RAW, setsockopt with HDRINCL and call to sendto.All functions seem to return fine (values other then -1) the function that I have used to calculate the checksum for the IPheader matches the value that I manually calculated. I just don?t see the anything coming out of the interface on whireshark.I assumed that it had something do with my piece of code so I used two examples (including mixter void ru rawip html A brief programming tutorial in C for raw sockets[/url]). They show exactly the same thing functions return fine but no packets being send.I use Ubuntu 9.04 2.6.28-14-genericThe machine has two interfaces one with an ip address the other interface is in promiscuous mode. (both interfaces connected to a switch with port mirroring) I can see all normal traffic in/out.
View 2 Replies View Relatedare there any linux command to have how many http request are sent and received??
View 4 Replies View RelatedI can ssh to my server which is on a LAN accessing the'Net through a Linksys modem/router.I want to be able to configure the Router by using the it's web interface, but the server only has a Command Line Interface and I can only run text browsers like Lynx,hich, although I can log onto the router, the Javascript routines mean that I can't configure the router.I can't access the router's web interface from the 'Net because the router is set up to pass any requests on port 80 to the server.Is there any way I can communicate with the router by sending HTTP requests from my browser external to the LANhaving these relayed to the router by the server and then the server relaying the responses back to my browser.
View 2 Replies View RelatedDear all,
My application has to listen to http request and it must be able to read the http header and then forward the request from proxy. All these things must be done on C/C++. please help me. Awaiting for your reply.
Thank in advance
I am not a networking expert by any means (in fact I have never taken a networking course), but I have taken several security courses, and generally we wind up discussing replay attacks. For example, the Needham-Schroeder protocol (using symmetric-key cryptography anyway) is flawed because it allows for replay attacks, and I understand why.
I guess my question is actually how someone would perform a replay attack. I know I can sniff network traffic by downloading wireshark. I also have downloaded winpcap and npg on my WinXP virtual machine. I'm trying to use this guide to help me, but I'm quite lost:[URL]What I did was to post a "link" to my facebook profile and I sniffed the traffic using wireshark. What I would ultimately like to accomplish is to copy that packet out of the wireshark output, and then use a tool like npg to transfer the raw packet back to facebook, which should result in a second, redundant post. I just can't figure out how to do that.
I'm pretty sure this should be possible. Facebook only uses an SSL session for authentication during login. After that, the information is just sent in the clear, so I'm pretty sure this should be possible.Can anyone explain how to do such a thing? It would really help my research paper that I'm working on this semester if you can. As of right now the attack we are trying to demonstrate/defend against is using a Windows VM, which is why I'm using winpcap/npg. The attack is actually possible using just about any OS (depending on the exploit used), but our POC is Windows only at the moment
Suppose I have computer A with ip address on eth0 of 192.168.0.1 and ip address on eth1 of 192.168.1.1. If I send packets to 192.168.1.1 from computer A, it automatically uses the loopback interface. Is it possible to modify the routing table some how to send these packets out on eth0 instead and have them route around the network and come back on eth1.I've tried 'route add -host 192.168.1.1 dev eth0' but it seems to completely ignore this entry.
View 5 Replies View RelatedThe following piece of code is suppose to send a UDP packet.but inside function udpsocketinit , i get a segmentation fault and i can not understand why
Code:
#include <arpa/inet.h>
#include <netinet/in.h>
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Hi,
In squid i have blocked some sites like facebook and ......I want to know is there any way when user type in his browser like www.facebook.com instead it show something like following it automatically redirect to www.google.com
Error
The requested URL could not be retrieved
The following error was encountered:
Access Denied.
Basically I want to redirect the http request so the user should not see the page not found error but www.google.com page may open automatically.
thanks
garden
hi
i want to redirect the packet to proxy server. can u help me.
Present network.
MY internal network ==> switch ==> proxyserver ==> router ==> internet.
(for internet i use
to connect proxy, in web browser==> lan settings ==> proxy server ip address )
What i want is
My internal network ==> getway or firewall ==> switch ==> proxy server ==> router==> internet. ( where this getway or firewall i can configure for forward http request to proxy server.)
so that i can separate my internal network from intranet but able to access the internet.
help me out
raghu
I want to build a topology of this kind:
|eth0 (a.a.a.a) |
Linux PC |<----------------> | ROUTER
|eth1 (b.b.b.b) |
|<----------------->|
the linux machine has two interfaces eth0 (a.a.a.a) and eth1 (b.b.b.b) connnected to two interfaces of a router. Now that if I send any packet destined to b.b.b.b from a.a.a.a interface on the linux machine, it should take the folowing path: eth0->router->eth1 . and it should be the same for vice versa.
