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• setting up a private network using linksys router

  - by user287745

  scenerio:- a database server running sql server 2005 and sql server management studio 2005 express editions a web server running IIS 5.0v using windows xp pro. two other computer having windows xp and windows 98 i have a linksys router which i use to access point for wireless (laptop) there are 5 sockets behind it four for clients and one for internet. i would like to setup a LAN- something like a private hosting area with two clients. would should i do? where to connect what and what would the changes in settnigs be. right now it uses dhcp or something to assign ips. where will the webserver be attached to the internet socket? where will the db server be attached? any guide, links, help thank you

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• SQUID Transparent SSL proxy (no intercept)

  - by user974896

  I know how to have squid work as a transparent proxy. You put it into transparent mode then use your router or IPTABLES to forward port 80 to the squid port. I would like to do the same for SSL. Every guide I see mentions setting up keys on the squid server. I do not want squid to actually decrypt the SSL traffic then establish a connection with the server, rather I would like squid to simply forward the SSL traffic as is. The only thing I would like to do is be able to check the SSL request for any offending IPs and drop the packets if the destination is one of them.

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• SSH rsa key works with external IP not internal IP

  - by Ian

  I am using rackspace cloud hosting. I have 2 servers behind a load balancer. Each server has an external IP and an internal IP. I want to setup a sync job that uses SSH to transfer files. I made an rsa key, and I can successfully SSH from server A into server B, using the external IP of server B, without being prompted for a password. If I try to do the same but use the internal IP, it prompts me for a password. I want to be able to use the key instead of the password. Why is this? Is there something special I have to do during key generation so it works for both IPs? Any help is appreciated.

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• 'Slow down' A DHCP server on purpose.

  - by Ced

  As the title implies, May look like a silly question, But what i'm trying to do, Is to have 2 DHCP servers in one network. One only leases IPs to Bootp clients (And if the client re-requests immediately after leases again) And one DHCP server, which is builtin with my PFsense router, that leases the non-bootp clients so they can access the internet and other network resources. I know by chance that PFsense uses ISC-DHCPd. Maybe they have a delay option? All i need to do to make sure the bootp/PXE boot clients get the proper address, is slow down the DHCP server in the PFsense box. Question is how. Anyone ideas? Thanks in advance

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• how to figure out why sites on my server aren't loading

  - by Derek

  I seem to randomly receive "page cannot load, cannot connect to server" errors for sites on one of my servers. when this happens, it seems to only happen on certain IPs or IP ranges at a time. I say this because while I'll get the error from my home laptop I'll be able to access the site fine from my work computer or from an offsite VPS. DNS records should already be fully propagated as these records were updated months ago. I have no idea how to diagnose what's going on. Is there a tool in cpanel or outside on the web that can help me figure out what's going on?

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• How to determine what program send the packet recorded in Wireshark?

  - by Tono Nam

  I was taking some tutorials on Wireshark in order to analyze the packets sent and received when talking to a web server for purposes of learning. When I start listening/recording packets in Wireshark, there where so many packages being recorded (700 packages per minute). Is it normal to have that much traffic if I have all the programs that will cause traffic such as all browsers, log me in, dropbox, goto meeting, etc., closed? In order to try to solve the problem I am analyzing random packets. Take for instance this filter: I just selected a random IP: 74.125.130.99. So how can I know from what program those packets where created? Also how can I get more info about that communication bwtween my computer (192.168.0.139) and that server (74.125.130.99)? I just selected a random IP from the Wireshark capture. There are also other IPs that I have no idea why they are communicating with my computer. How can I figure that out?

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• Port Forwarding for Remote Desktop

  - by Vaibhav Bajpai

  I have two Mac notebooks at home, I have assigned them static private IPs. I have also set my router to a DynDNS address, which updates everytime my router gets a new public IP. I have enabled Screen Sharing on both notebooks. I can successfully goto my router webpage using the DynDNS address. I understand I need to port-forward to get Screen Sharing to work from outside. Lets assume, notebooks have private IP 192.168.1.2 and 192.168.1.3 I am kind of lost here, would appreciate some help (I need to be able remote desktop to both notebooks)

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• How can I setup a Firewall without NAT?

  - by SRobertJames

  We have 16 IP addresses from our ISP, and are setting up a SonicWall Firewall. I'd like to have the SonicWall do NAT for the LAN, but act as a firewall only (no NAT) for the servers which are using some of the 16 addresses. How do I set this up? If I set the WAN's subnet to include the 16 IPs, the SonicWall won't route the traffic to the LAN interface. Should I set the WAN subnet to only include the ones we are dedicating for NAT, and then keep the others on the LAN? Related point: How can I set multiple IP addresses for a SonicWall LAN interface?

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• What could be the maximum number of hosts on a 100BaseTX ethernet network ?

  - by snowflake

  Hello, I'm having two ip networks (192.168.1.x and 192.168.2.x) bridged on a server, but all hosts (fixed IPs) are on the same physical 100BaseTX ethernet (with a daisy chain of 48ports switchs). Often, I loose link between the server and hosts of the second network. Usually if I reboot the host, the connection work again, and if I force connection to be active, the connection keep alive until I ping after a while without active connection. I'm wondering how many hosts can be connected on the same network without troubles, and eventually how many switches can be daisy chained ? I suppose maximum length between hosts to be 100meters to the hub or 200meters between extremity of the network. Somebody is suggesting 8 switches here : http://www.tek-tips.com/viewthread.cfm?qid=1137879&page=12 Any comments on how to find a solution to the problem and not answering directly to the question are welcomed!

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• SSH reverse tunnel to monitor and manage remote devices

  - by acid_crucifix

  I have a set a distributed set of devices running Ubuntu 12.04 that I am distributing to clients. I would like to manage them remotely. They may not have fixed IPs and potentially might be behind firewalls. What I am planning to do is have the devices (permanently connected to the net) poll a request URL and based on the response open a reverse tunnel to my server, so that I can access them via that tunnel. Most of what I read about reverse tunnel over SSH is for single use cases and very little about heavy production usage. Is there some reason for this, security issues? or stability? Any help would be much obliged.

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• Cisco 2911 - problem with DHCP

  - by bluszcz

  Hi, i am configuring DHCP daemon on Cisco 2911. At some point i assigned address 192.168.50.50 to one box (using MAC address 'relation'). When I wanted to saved config - I got warning, that address 192.168.50.50 is already in Pool, which sounds bit weird - it was first host which I started configuring. I tried with following commands: clear ip dhcp server statistics clear ip dhcp conflict but first one doesn't output anything (and show statistics shows that there are 2 addresses in pool), and second one throws "there is no conflicted ips" message. How I can force/purge/clear/allow to bind 192.168.50.50 to this box?

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• Reverse SCP over SSH connection

  - by pavpanchekha

  I pretty often need some file from some server when I'm on my laptop. But if I don't know where that file is, I have to ssh into the server, look around, exit, and then scp server:file .. If I'm working with my desktop and my server, both of which have static IPs, I can just SCP the file in reverse (scp desktop:~ file), but I can't do that for my laptop. Is there any nice way to SCP a file backwards over an SSH connection? So that the computer I connect to with SSH sends a file backwards to the client?

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• How to manage a large email delivery volume from a Email Marketing App ?

  - by Newtonx

  We provide Email Marketing service through our online Application. We have about 30 customers. And each one has it's own mailling list (5k to 100k emails each). What we really want is to distribute email's delivery between 2 or more servers. I was wondering What kind of aproach/solutions MailChimp , Constant Contact uses to provide a great service ? use many servers ? many IPs ? Our spam policy suspends ANY user/customer that gets 10% bounced . We currently rotate our outgoing Mail Ip once deliveries limit per remote host is reached. Is it the best approach/solution ?

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• How to manage a large email delivery volume from a Email Marketing App ?

  - by Newtonx

  We provide Email Marketing service through our online Application. We have about 30 customers. And each one has it's own mailling list (5k to 100k emails each). What we really want is to distribute email's delivery between 2 or more servers. I was wondering What kind of aproach/solutions MailChimp , Constant Contact uses to provide a great service ? use many servers ? many IPs ? Our spam policy suspends ANY user/customer that gets 10% bounced . We currently rotate our outgoing Mail Ip once deliveries limit per remote host is reached. Is it the best approach/solution ?

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• Problem connecting to Ubuntu Server in same local network.

  - by frbry

  I have my LAN set up as below: 192.168.2.1: ADSL Router (DHCP Range: 192.168.2.2-192.168.2.250) 192.168.2.254: Wireless Access Point 192.168.2.253: Ubuntu Server (Static IP) 192.168.2.2: My Laptop (Connects to Internet via the Wireless AP) NAT in router is active and set up to transfer requests made over port 80 to 192.168.2.253. Router's firewall is inactive. No IPs in DMZ. My friends get Apache's It Works page when they try to enter http://my_external_ip. But I get Router's configuration page instead of that. What should I check or do? Thanks.

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• Opening firewall to incoming port 443

  - by jrdioko

  I recently set up the ufw firewall on a Linux machine so that outgoing connections are allowed, incoming connections are denied, and denied connections are logged. This seems to work fine for most cases, but I see many denied connections that are incoming on port 443 (many with IPs associated with Facebook). I can open that port to incoming connections, but first wanted to ask what these could be. Shouldn't HTTPS requests be initiated by me and be treated as outbound, not inbound connections? Is it typical to open incoming port 443 on consumer firewalls?

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• Amazon EC2 firewall rules & VPN connections

  - by John

  I'm moving from Rackspace to Amazon EC2. One thing I like about our Rackspace setup is that it is extremely secure. The MySQL box can only be accessed via internal IPs, and we have a Cisco VPN firewall that allows us to dial in remotely and access port 3306 as though we were on the internal network. I'd like to figure out how to replicate this setup with EC2. How can I make the MySQL box so that port 3306 can only be accessed on the internal network? What about the VPN piece of things? I know Amazon has the VPC service, but it seems like that's for the purpose of connecting to an existing network. I don't have an existing network. I want to essentially create one inside Amazon and connect to that. What are my options? Any good tutorials on how to get started? Thanks in advance for your help

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• MMS gets hostname from uname and can't connect to it

  - by Adam Monsen

  I'm trying to get 10gen's MongoDB Monitoring Service monitoring my 3-node replica set. The replica set running in an AWS VPC. Each node runs on a different [virtual] machine. Assume their IPs are 192.168.1.1 (primary or secondary), 192.168.1.2 (primary or secondary), 192.168.1.3 (arbiter). From a quick look at the source, MMS appears to get the hostname of the machine it is running on like so: platform.uname()[1] For my VPC EC2 instance, this returns something like ip-192-168-1-1 MMS then tries to connect to this hostname, which does not resolve. I'd rather just use IP addresses (since they're always static), but it seems like the hardcoded use of platform.uname()[1] in mmsAgent.py precludes that. So, what's an elegant way out of this? Hack /etc/hosts? I'm not setting up a DNS server just for this. Maybe I'm just misunderstanding how to configure MMS.

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• how to configure svn between two remote system on different network?

  - by Ghost Answer

  The story is that I have two systems on two different network IPs (like client on 10.0.15.24 and server on 117.152.18.140). I am communicating between them by team viewer port 80. I have installed svn subversion on server and svn client on client system. I also installed apache server on server system. Now my question is that I want to configure them. first is it possible, if yes, then please give the proper suggestion. Is there any changes to be make in firewall on server or client or both. thanks

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• VPN provider for remote access to servers from a known IP address

  - by brentkeller

  My organization has a few servers that are being hosted by a provider and we limit remote access to a whitelist and deny access to any IPs not on the whitelist. We would like to find a hosted VPN service that we can connect to that would give us a known IP that we could add to our whitelist and gain access to the servers while on the road. Does anyone know of any such services? I don't think we can just setup the VPN built in to Windows Server since the servers are hosted. Any suggestions would be appreciated.

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• HTTPS vs. VPN for communication between business partners?

  - by Andrew H

  A business partner has asked to set up a site-to-site VPN just so that a few servers can communicate with each other over HTTPS. I'm convinced this isn't necessary, or even desirable. To be fair it must be part of a wider policy, potentially even a legal requirement. However I'd like to convince them to simply offer an IP to us (and us only) and a port of their choosing for HTTPS. Has anyone had a similar experience, or had to come up with a cast-iron argument against a VPN? Allow me to expand a little - we have a web service that initiates a connection to the partner's corresponding service using an encrypted HTTP connection. The connection uses a client certificate to authenticate. The connection is firewalled so only our IPs can contact the service. So why is a VPN necessary?

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• What's the best way to block IP spoofing on a layer 3 switch?

  - by toupeira

  We're hosting Dedicated Servers and are currently using old 3com switches with IP-based ACLs. So each port has an ACL that allows all IP addresses assigned to this customer, and blocks everything else. But now 3com was bought by HP, and the follow-up model only supports basic ACL that aren't flexible enough to both allow certain IPs while blocking others. Looking at other switches in a similar price-range, we've found that most of them have similar problems or don't offer any ACL features at all. I assume this could also somehow be done with VLANs, but if I understand this correctly we'd still need some kind of ACL to actually specify the valid IP addresses for each port. What do you use to make sure your customers don't use unassigned IP addresses? Or what switches can you recommend that have flexible ACL functionality?

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• Remote execution in Workgroup network

  - by ayyob khademi

  Consider this scenario: Please don't say that it would be better if I created a Domain network; Just consider this scenario. 10 PCs are all interconnected via a switch to a workgroup network named WORKGROUP; PCs specs(all are the same): Windows XP SP2 en (build:2600.xpsp_sp2_rtm.040803-2158) I have full physical control over my own PC (one of those 10 PCs) and what I know about the other ones: IPs of all 10 PCs. Administrator account name of all 10 PCs. Administrator account password of all 10 PCs. How can I execute an application on the other PCs???(without touching them) How can modify their registry settings???(without touching them)

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• NTP configuration not recognized?

  - by Eugene S

  I'm trying to configure NTP on my machine but it seems that the parameters I set are not being read by the system. Below is my /etc/ntp.conf file. (I applied the most basic configuration to eliminate other issues) server 10.45.68.47 server 127.0.0.1 After I set the above configuration, I restart the ntpd process by doing the following: service ntpd restart And then I get the following output: Shutting down ntpd: [ OK ] ntpd: Synchronizing with time server: [FAILED] Starting ntpd: [ OK ] Moreover, I can see the following in /var/etc/messages: Apr 2 10:54:07 hsystem1a ntpd[21067]: ntpd exiting on signal 15 Apr 2 10:54:07 hsystem1a ntpdate[21537]: can't find host ntpServer1 Apr 2 10:54:07 hsystem1a ntpdate[21537]: can't find host ntpServer2 Apr 2 10:54:07 hsystem1a ntpdate[21537]: no servers can be used, exiting So it seems that the ntpServer1 and the ntpServer2 are being read from somewhere instead of the IPs I configured in /etc/ntp.conf. NOTE: I done init 6 on the machine just in case. Thanks!

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• How do I stop someone from saturating my line & wasting CPU cycles

  - by JoshRibs

  My web host shows inbound & outbound traffic with mrtg. I have a steady 3.5mbps inbound traffic from Nigeria. Even assuming the source IPs & destination ports are blocked with Iptables & verifying nothing is listening on those ports, will the traffic still always pass through the switch & "get" to my server (where my server wastes CPU cycles "dropping" the packets)? Assuming I was setup with a hardware firewall, the traffic would still show in mrtg assuming the firewall is behind the switch? So is there any way to stop someone from saturating your 100mbps line, if they also have a 100mbps line? Other than filing an abuse complaint with the kind folks in Nigeria?

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