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• Postfix sendmail -f configuration

  - by William

  I have Postfix installed on two servers. One of them writes e-mail (satellite) and the other one delivers the e-mails (smarthost). When I write e-mail from the satellite server I'm using the sendmail command. My problem is that when e-mail arrives the Return-Path is set to the user@hostname where user is the user that is running sendmail and hostname is the servers hostname. If I use the parameter -f with sendmail I change that, but I'm hoping there is a way to do it in a configuration file for Postfix. Is this possible or should I just deal with having to configure all my software to add the -f argument? Thanks in advanced.

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• esxi change MKS port

  - by Daniel Powell

  I need to connect to my home esxi box over the web however I cannot use the default port 902 for the console viewer due to firewall restrictions. Is there a way to change this port somewhere even if i can just do some nat and redirect any other port to that port? I've had a look around and when I try to connect to the esxi server in vSphere client I cant find anywhere I can specify the port. I know this is not the recommended way to do this but its a testing server and security is not an absolute must on this box. I also cannot setup a vpn to this box.

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• Access internal host from a subdomain of an external dns

  - by Mihai

  This image contains the topology I want to make work. I have a linux server that is used for hosting websites and also routing for our internal network. How can I access the internal server that hosts the team foundation server from outside from a domain like teamfoundation.example.com. The parent domain is hosted on the linux machine, is there a way to NAT the dns queries to the windows server? |LINUX SERVER| example.com | | Windows Server(teamfoundation.example.com) _______|_________SWITCH Internal Network

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• How do I combine static and dynamic DHCP leases on a Cisco router?

  - by Brad

  Basically, what I need is super similar to the unanswered cisco forum question below: https://supportforums.cisco.com/message/3139749#3139749 I have a Cisco 850 Series router. I have configured a DHCP pool for the 10.0.0.0/24 network. I have excluded 10.0.0.1 - 10.0.0.99 from the DHCP pool. I want to add a static DHCP pool for stuff and I want DHCP to statically assign them the addresses of my choice below 100. Actually, I don't care what addresses I statically assign. They can be anything in the pool for all I care, I just want it to work. Why are you doing this? Just statically assign the IPs on the devices! I don't want to do this because I have some laptop users. They could obviously only use that static IP here. This isn't a problem if they could be bothered to change any location setting or something. They can't. So it HAS to be DHCP. It also has to be static IPs because I need to forward ports to them. I know, I know, this is weird but it's an apartment LAN/WLAN so this isn't exactly a typical use case. Relevant sections of config below: ip dhcp excluded-address 10.0.0.1 10.0.0.99 ! ip dhcp pool Internal-net import all network 10.0.0.0 255.255.255.0 default-router 10.0.0.1 domain-name 1770.local lease 7 ! ip dhcp pool static-pool import all origin file flash://staticmap default-router 10.0.0.1 domain-name 1770.local Contents of staticmap: *time* Aug 5 2010 09:00 AM *version* 2 !IP address Type Hardware address Lease expiration 10.0.0.100/24 1 001f.5b3e.d50a Infinite *end* You can see here I was trying addresses outside the excluded-address range to see if that would make any difference. My testing machine's MAC: mainframe:~ brad$ ifconfig en1 en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 00:1f:5b:3e:d5:0a What shows up in the DHCP binding table: basestar#show ip dhcp binding Bindings from all pools not associated with VRF: IP address Client-ID/ Lease expiration Type Hardware address/ User name 10.0.0.112 0100.1f5b.3ed5.0a Aug 12 2010 10:06 AM Automatic What's up with the funny looking MAC in the DHCP binding table?? Is what I'm trying to accomplish basically impossible? Am I going about this the wrong way? All I want to to be able to port forward some ports to specific devices. The way I would do this with a consumer router is to do what I'm trying to do here; assign static DHCP to those devices then configure PAT for ports on those addresses.

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• OpenVPN/Tunnelblick through wireless router, no connection.

  - by Oscar

  I'm using OpenVPN with Tunneblick on my Macbook Pro to access a server on my job. I't works fine, but i can't get it working with my Netgear WGT624v3 wireless router. I get this warning: WARNING: potential route subnet conflict between local LAN [192.168.1.0/255.255.255.0] and remote VPN [192.168.1.0/255.255.255.0] Someone told me that i should "port forward" on my router, but i can't figure out the right settings. Also not shure i'm doing it right.

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• Windows Firewall: How to allow traffic on port 8080?

  - by Chadworthington

  I am trying to configure team Foundation Server so that 1) it is accessible from within my Home Network 2) and then make the Web site access accessible via the Internet I have a problem with point 1: When I access http://192.168.1.106:8080/tfs/web/ locally from 192.168.1.106, it works. When I access the same web site from another PC in my home network, the abive URL works only if I turn of the Firewall on 192.168.1.106. Can someone please tell me specifically how to allow traffic on port 8080 without turning off Windows Firewall? It seems that the exceptions that I specify are intended for listing programs on the box that need to communicate out. Is IIS the program that I need to make the exception? How do I specify that port 8080 traffic should be allowed for web site traffic on this port? I hope to have success with pt. 2 later but I figure (1) should be done first. I expect issues.

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• Windows Server 2003 Router with PortForwarding

  - by jM2.me

  Hello, I am owning a small company and we have purchased a server to setup few server applications on it as well as other software. We would like to setup our network in following way Internet<-WindowsServer2003 as router<-Switch<-Office Computers Server has two nic interfaces and we have 24ports 1GB network switch connected to one nic and internet connection to another nic. Our ISP is Frontier and we have Fios 25/25. We get network cable out of ONT box directly connected to our server. There are no modems/routers. Setting up DHCP on windows 2003 is easy job but we would like to have the ability to port forward some ports from office computers. I have some knowledge in networking but not as much. How could I setup FHCP server on win2k3 with the ability to port forward some ports to office computers? Thank you for your time

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• Acces internal host from a subdomain of an external dns

  - by Mihai

  Hy to all this image contains the topology i want to make it work. I have a linux server that is used for hosting websites and also routing for our internal network. How can i acces the internal server that hosts the team foundation server from outside, from a domain like teamfoundation.example.com. The parent domain is hosted on the linux machine, is there anyway to NAT the dns queries to the windows server? |LINUX SERVER| example.com | | Windows Server(teamfoundation.example.com) _|___SWITCH Internal Network

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• Redirect 'host-based' requests to a port (inside a docker container)

  - by Disco

  I'm trying to achieve this fun project of having multiple 'postfix/dovecot' instances inside a docker container. I'm searching for 'something' that would redirect any incoming request on port 25 (any maybe later 143, 993) to the right container on a different port. Here's the idea : +-------+ +----------+ (internet)----(port 25) |mainbox| ---- (port 52032) |container1| (postfix) +-------+ | +----------+ \ (port 52033) +----------+ |container2| (postfix) +----------+ So the idea is to 'redirect' requests coming to port 25 and based on 'hostname' to forward to the right port (internally); ideally, it would be great to manage this 'mapping' with a database/textfile Any ideas ? Directions ?

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• Howto configure openSuSE firewall to route local traffic to local ports

  - by Eduard Wirch

  I have openSUSE 11.3 installed. I'm using the openSUSE firewall configuration mechanism (/etc/sysconfig/SuSEfirewall2). I have a http server application running on port 8080. I want the http service to be accessible using port 80. I created a redirect rule usign: FW_REDIRECT="0/0,0/0,tcp,80,8080" This works fine for every request coming from external. But it doesn't for local requests. (example: wget http://myserver/) Is there a way how I can tell the firewall to redirect local requests addressed for 80 to port 8080? (using the SUSE firewall configuration file)

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• iptables not writing rules.

  - by Darkmage

  im running these two rules as root, but when doing a iptables -L it dosent show any rules, any one have an idea of what the problem can be? iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 --source 84.244.145.135 -j REDIRECT --to-port 1222 iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 --source 243.134.97.194 -j REDIRECT --to-port 1222 duno@Virtual-Box:/home/glennwiz# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination

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• SSH Port Forward 22

  - by j1199dm

  I'm trying to set up the following: At work I want to create a local port that will forward to port 22 on my home server. ssh -L 56879:home:22 username@home -p 443 right now I'm testing this on my two machines at home, my ubuntu server and the other my iMac. iMac: 192.168.1.104 ubuntu: 192.168.1.103 iMac - ssh -p 443 -L 56879:192.168.1.103:22 [email protected] in my ~/.ssh/config on my iMac I have port set to 56879. so when I do git pull remoteserver:/path/to/repo.git on my iMac git will use ssh client on my iMac and use port 56879 since setup in config which should forward to 22 on my ubuntu machine. I keep getting connection refused? Any ideas?

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• Automatically allowing SSH into a machine behind a UPNP router?

  - by GJ

  Hi I have a MacBook connecting to the Internet from behind various routers from time to time (home, office, etc). All of the routers support UPNP. I need to allow a co-worker to SSH into the machine, without configuring each router each time to forward port 22 to the MacBook. Is there any way to get the MacBook to use UPNP (or some other method) to automatically configure any supporting router that it is behind to forward port 22 to itself? That would allow the co-worker to SSH into the MacBook but just knowing its external IP, which is easy.

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• Hosting 3 domains on 3 PC (1 domain per PC) with only 1 static IP address

  - by StealthRT

  Hey all i am trying to figure this out here. I have 3 PC's that are hooked into my router which i have a static IP for. I am currently hosting a web site (ex: blah1.com) on the 1st PC but have yet to connect PC 2 and 3 up to the network. That one PC thats online is using port 77. I direct all 80 traffic to port 77 using that servers IP address (192.168.x.xxx) My question is, how can i direct traffic for my other 2 domains (ex: blah2.com and blah3.com) to the 2 individual PC's (ip's) as i already am doing with the 1st PC if i can only use one port 80 to direct taffic to the website in?

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• How to forward UDP and TCP traffic from one IP to another

  - by Rishabh Agnihotri

  Well i have a server with two LAN Card Installed.I have a server in U.S and one in India.I have created a GRE tunnel to route all traffic from U.S Server to my Indian Server.My Traffic has UDP,TCP,HTTP,etc Traffic.Now i have two LAN Card on my Indian Server.Well i have configured two IPs on the system for some of my needs on the system.One is a /30 and another is a /24.Well now i want the /30 IP to talk to my /24 IP.Lets take a e.g the IPs are 180.151.130.34 - /30 and 103.243.19.254 -/24 I want to forward all the TCP,UDP,HTTP,etc like traffic coming to 180.151.130.34 to 103.243.19.254.In the sense i want to make them talk to each other in a way if a TCP/UDP Packet comes to 180.151.130.34 it should be forwarded to 103.243.19.254 and then that packet is sent back by 103.243.19.254 to 180.151.130.34.I am not able to configure this part.Can anyone tell me step by step how to do so? Well i forgot to specify i am using Windows Server 2008. Any help would be greatly appreciated.Thanks in advance.

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• How do I block certain forwarded emails in Gmail? [closed]

  - by Phenom

  I have two Gmail accounts. I setup my old Gmail account to forward to my new Gmail account. However, there are some emails that I don't want forwarded. How would I stop these from getting forwarded?

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• X11 display over ssh with monitor connected to remote machine

  - by Sumit

  I have the following setup: Machine A (a.corp, 192.168.100.130, local machine) and Machine B (b.corp, remote machine) and a monitor is connected to each of these machines. When I ssh from a.corp to b.corp as $ ssh -X b.corp $ xclock Error: Can't open display: I tried setting the DISPLAY variable as $ ssh -X b.corp $ export DISPLAY=`echo $SSH_CLIENT|cut -f1 -d\ `:0.0 $ echo $DISPLAY 192.168.100.130:0.0 $ xclock xclock's display opens up but on the monitor connected to b.corp (remote machine) and not on the monitor connected to a.corp (local machine). Is there a way to force the display to appear on the monitor of the local machine (a.corp)?

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• Postfix sends to original recipient name instead of alias name

  - by user141742

  I have setup Postfix as part of my ISPConfig implementation. It should just forward all mail. Clients should be able to define a new alias and receive mail on a different e-mail address, using ISPConfig. Example: A mail sent to [email protected] on my ISPConfig server should be forwarded to external mailbox [email protected] This works fine but one important thing. When opening the mailbox for [email protected] I see the mail with the original sender name, and the original recipient name, i.e. [email protected] I have tried the forward function and the send copy function on a mailbox in ISPConfig. Both cases show the original recipient [email protected] instead of the final recipient [email protected], as it would when I manually forward an e-mail. Can this be achieved without having to maintain a list for each entry? Thanks for looking into this. M.

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• Is there a way to have a virtual directory in iis 7 point to another domain?

  - by Dan Appleyard

  Let us say I have two subdomains: http://content.mydomain.com and http://app.mydomain.com. http://content.mydomain.com is pointing at a different server than http://app.mydomain.com is. Is there a way to get a url of http://app.domain/content to point to http://content.mydomain.com without the url in the browser changing to the subdomain? I am trying to get this to work in IIS 7 / 6 and am having issues. Any advice would be greatly appreciated!

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• Want to use apache, ISP blocking port 80

  - by Will

  I am attempting to set up a small web server on my home network, but my ISP is blocking incoming port 80 ( and no, i'm not paying $50/month extra for them to unblock it). I am looking for some ways around this, obviously I can change the port # but I don't find this ideal. really appreciate any ideas for this

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• Are random packets normal?

  - by TheLQ

  About a month ago on one of my servers I started receiving random packets from IPs all over the world. So I did the smart thing and stopped putting off installing an IDS. This IDS is a ClearOS Gateway which comes with Snort and SnortSam. I enabled it, checked There is a total of 4 ports open, two of which forward to the server I'm talking about. These ports are 3724 and 8085, so they aren't going to be easily detected in a port scan. However checking some logs of this server I found that the attack is resuming. I found this ... Accepting connection from '75.166.155.122' [Auth] got unknown packet from '75.166.155.122' Accepting connection from '98.164.154.93' [Auth] got unknown packet from '98.164.154.93' Ping MySQL to keep connection alive Accepting connection from '70.241.195.129' [Auth] got unknown packet from '70.241.195.129' Accepting connection from '67.182.229.169' [Auth] got unknown packet from '67.182.229.169' Accepting connection from '69.137.140.38' [Auth] got unknown packet from '69.137.140.38' Accepting connection from '76.31.72.55' [Auth] got unknown packet from '76.31.72.55' Accepting connection from '97.88.139.39' [Auth] got unknown packet from '97.88.139.39' Accepting connection from '173.35.62.112' [Auth] got unknown packet from '173.35.62.112' Accepting connection from '187.15.10.73' [Auth] got unknown packet from '187.15.10.73' Accepting connection from '66.66.94.124' [Auth] got unknown packet from '66.66.94.124' Accepting connection from '75.159.219.124' [Auth] got unknown packet from '75.159.219.124' Accepting connection from '99.102.100.82' [Auth] got unknown packet from '99.102.100.82' Accepting connection from '24.128.240.45' [Auth] got unknown packet from '24.128.240.45' Accepting connection from '99.231.7.39' [Auth] got unknown packet from '99.231.7.39' Accepting connection from '206.255.79.56' [Auth] got unknown packet from '206.255.79.56' Accepting connection from '68.97.106.235' [Auth] got unknown packet from '68.97.106.235' Accepting connection from '69.134.67.251' [Auth] got unknown packet from '69.134.67.251' Accepting connection from '63.228.138.186' [Auth] got unknown packet from '63.228.138.186' Accepting connection from '184.39.146.193' [Auth] got unknown packet from '184.39.146.193' Accepting connection from '69.171.161.102' [Auth] got unknown packet from '69.171.161.102' Accepting connection from '76.0.47.228' [Auth] got unknown packet from '76.0.47.228' Ping MySQL to keep connection alive Accepting connection from '126.112.201.14' [Auth] got unknown packet from '126.112.201.14' Ping MySQL to keep connection alive Now that scares me. Why isn't Snort detecting this? How were they able to find this specific port? More importantly, what normally would these packets contain? Is this something I should be worried about? How can I stop this?

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• Iptables based router inside KVM virtual machine

  - by Anton

  I have KVM virtual machine (CentOS 6.2 x64), it has 2 NIC: eth0 - real external IP 1.2.3.4 (simplified example instead of real one) eth1 - local internal IP 172.16.0.1 Now I'm trying to make port mapping 1.2.3.4:80 = 172.16.0.2:80 Current iptables rules: # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *nat :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o eth0 -j MASQUERADE -A PREROUTING -p tcp -m tcp -d 1.2.3.4 --dport 80 -j DNAT --to-destination 172.16.0.2:80 COMMIT # Completed on Fri Jun 29 17:53:36 2012 # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *mangle :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT # Completed on Fri Jun 29 17:53:36 2012 # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] COMMIT # Completed on Fri Jun 29 17:53:36 2012 But there is nothing works, I mean it does not forwards that port. Similar configuration without virtualization seems to be working. What am I missing? Thanks!

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• how to setup sonicwall tz210 to port forward packets received from external ip to another external ip

  - by lplp

  i have a sonicwall tz210 on a fixed ip, say ip1. And then i have, let's say a legacy server, with external ip ip2, which sends data to ip1 (and I have another server on ip1 behind the sonicwall which receives and processes that data). I would like to set up a new server on a different external ip ip3 that will receive and process data from the legacy server. How can I setup the sonicwall so that the packets received from the legacy server (from an external ip) are port forwarded to the external ip address ip3?

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• Howto configure openSuSE firewall to route local traffic to local ports

  - by Eduard Wirch

  I have openSUSE 11.3 installed. I'm using the openSUSE firewall configuration mechanism (/etc/sysconfig/SuSEfirewall2). I have a http server application running on port 8080. I want the http service to be accessible using port 80. I created a redirect rule usign: FW_REDIRECT="0/0,0/0,tcp,80,8080" This works fine for every request coming from external. But it doesn't for local requests. (example: wget http://myserver/) Is there a way how I can tell the firewall to redirect local requests addressed for 80 to port 8080? (using the SUSE firewall configuration file)

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• IPtables: DNAT not working

  - by GetFree

  In a CentOS server I have, I want to forward port 8080 to a third-party webserver. So I added this rule: iptables -t nat -A PREROUTING -p tcp --dport 8080 -j DNAT --to-destination thirdparty_server_ip:80 But it doesn't seem to work. In an effort to debug the process, I added these two LOG rules: iptables -t mangle -A PREROUTING -p tcp --src my_laptop_ip --dport ! 22 -j LOG --log-level warning --log-prefix "[_REQUEST_COMING_FROM_CLIENT_] " iptables -t nat -A POSTROUTING -p tcp --dst thirdparty_server_ip -j LOG --log-level warning --log-prefix "[_REQUEST_BEING_FORWARDED_] " (the --dport ! 22 part is there just to filter out the SSH traffic so that my log file doesn't get flooded) According to this page the mangle/PREROUTING chain is the first one to process incomming packets and the nat/POSTROUTING chain is the last one to process outgoing packets. And since the nat/PREROUTING chain comes in the middle of the other two, the three rules should do this: the rule in mangle/PREROUTING logs the incomming packets the rule in nat/PREROUTING modifies the packets (it changes the dest IP and port) the rule in nat/POSTROUTING logs the modified packets about to be forwarded Although the first rule does log incomming packets comming from my laptop, the third rule doesn't log the packets which are supposed to be modified by the second rule. It does log, however, packets that are produced in the server, hence I know the two LOG rules are working properly. Why are the packets not being forwarded, or at least why are they not being logged by the third rule? PS: there are no more rules than those three. All other chains in all tables are empty and with policy ACCEPT.

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