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• Allow access to printer between interfaces on Cisco ASA5510

  - by Jonas Stensved

  I have a Cisco ASA5510 where we have to separate networks on two separate interfaces. The networks have and should have nothing to do with each other except that network B needs to access a printer on network A. Network A: 192.168.137.0/24 Printer: 192.168.137.20 Network B: 192.168.0.0/24 I've added an incoming rule from Network A to the Printer IP in the ASDM interface but clients can't print. Our previous router was configured to let traffic through so the clients on Network B is already configured so it think it should work if the traffic is allowed. How do I let clients on Network B communicate with the printer?

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• pptp VPN, routing

  - by Adrian

  Details: eth0 = current internet port pptp1 = VPN connection, if I connect to my provider, he give me an IP address, which is accessible from the internet. This is what I need. I want to connect through this IP back to my PC. I want to keep my primary internet connection (eth0) on my PC for all traffic, but route traffic to VPN for specified application/or port, to access application/port from the IP, which I given from the pptp provider. Huhh? Difficult but, it is possible? If yes, how? Incoming port will be always: 33340 Outgoing port can be change, but usually it is 33330

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• Virtualbox - routing subnet to bridge adapters

  - by user42384

  Hello, I have set up a Debian Lenny box with 3 vbox Lenny machines running eth0 of the host in bridged mode (on virtualbox 3.1.6). When testing in my local LAN, this all worked perfectly well and traffic flowed to and from the IPs of the virtual machines as it should. However, now that it's in its co-lo home, the networking setup is a bit different, and I'm unable to get traffic to flow to the vboxes properly. Specifically, the host has its own Primary IP, and I have a separate subnet of 8 (6 usable) IPs routed to the box for use by the vboxes. So, eth0 on host is: Machine IP: 2x.x.x.137 Gateway IP: 2x.x.x.138 Subnet Msk: 255.255.255.252 Subnet for vboxes is Subnet: 2x.x.x.240/29 Netmask: 255.255.255.248 vbox1 is configured to 2x.x.x.241 on eth0 as follows: auto eth0 iface eth0 inet static address 2x.x.x.241 netmask 255.255.255.248 Setting up a virtual interface (eth0:0) on the host with one of these subnet IPs allows me to ping to that address only from vbox1, and it allows me to ping vbox1 from the host. I can also ping that virtual interface perfectly well from outside, so the IPs are definitely landing at my machine. It seems I'm missing some sort of routing instruction either on the host or vbox1 to get traffic moving between the subnet and the default gateway, but I can't seem to figure out what it should be, or what glaringly obvious thing i'm missing. Most of my obvious attempts (the gw of eth0, the ip of eth0) were rejected by route command with SIOCADDRT: No such device (eg - i can't find it). I tried setting vbox1 to bridge on eth0:0, but this was not an acceptable device name and VBoxHeadless refused to start. The physical machine does have an unused physical NIC at eth1 that can be used if necessary for something or other. Host machine is running iptables configured by ferm, have experimented with it allowing forwarding for that subnet, but I wouldn't have thought this was necessary given the nature of the virtualbox devices (nor did it actually work). Clearing out all of these rules for a blank iptables set does not resolve the issue. (you can see ferm generated iptables at http://codedumper.com/ojaze) Thanks for any help you can give... Patrick

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• Optimal way to make MySQL backups for fairly large databases (MyISAM / InnoDB)

  - by WinkyWolly

  Currently we have one beefy MySQL database that runs a couple of high traffic Django based websites as well as some e-commerce websites of decent size. As a result we have a fair amount of large databases using both InnoDB and MyISAM tables. Unfortunately we've recently hit a wall due to the amount of traffic so I've setup another master server to help alleviate reads / backups. Now at the moment I simply use mysqldump with a few arguments and it's proven to be fine.. until now. Obviously mysqldump is a slow quick method however I believe we've outgrown its use. I now need a good alternative and have been looking into utilizing Maatkits mk-parallel-dump utility or an LVM snapshot solution. Succinct short version: I have a fairly large MySQL databases I need to backup Current method using mysqldump is inefficient and slow (causing issues) Looking into something such as mk-parallel-dump or LVM snapshots Any recommendations or ideas would be appreciated - since I have to re-do how we're doing things I rather have it done properly / most efficient :).

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• With ARC why use @properties anymore?

  - by trapper

  In non-ARC code retained properties handily take care of memory management for you using the self.property = syntax, so we were taught to use them for practically everything. But now with ARC this memory management is no longer an issue, so does the reason for using properties evaporate? is there still any good reason (obviously other than providing public access to instance variables) to use properties anymore?

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• Using a AWS EC2 Server to host a busy website and I need to set up a loadbalancing

  - by Philip Isaacs

  My company has one EC2 server running on AWS with a MYSQL-DB and Apache on the same instance. This one instance hosts a website built on PHP Zend Framework. The site runs like crap when it starts to get busy with a lot of traffic so I'm looking for some advice on how to set up something that can handle the load better. My first question is should I move the mysql DB on to a separate EC2 instance or perhaps use AWS's RDS service which looks like a nice option. I'm sort of new to some of this but I'm guessing I'll need at least two EC2 instances for serving the website from and some sort of load balancing mechanism to distribute traffic. But maybe not, I'm not sure. Also what are some best practices for how to replicate the data so that they stay in sync on both instances? Okay I know these are a lot of questions. But I don't know where to start so any advice will help.

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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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• monitoring TCP/IP performance on Solaris

  - by Andy Faibishenko

  I am trying to tune a high message traffic system running on Solaris. The architecture is a large number (600) of clients which connect via TCP to a big Solaris server and then send/receive relatively small messages (.5 to 1K payload) at high rates. The goal is to minimize the latency of each message processed. I suspect that the TCP stack of the server is getting overwhelmed by all the traffic. What are some commands/metrics that I can use to confirm this, and in case this is true, what is the best way to alleviate this bottleneck?

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• Are there other application layer firewalls like Microfot TMG (ISA) that do advanced http rules?

  - by Bret Fisher

  Since the old days ISA and now TMG have had several great features that I often want to deploy to my customers because of the enhanced functionality and security, but often the cost of an additinal server HW, Windows Server, and TMG license is too much to justify when compaired to a $300-500 appliance. Are there other gateway firewalls that can perform one or more of these application layer features: pre-auth incoming http traffic against AD/LDAP before sending packets to internal server (forms auth or basic creds popup)? read host headers of incoming http traffic (even on https) to a single public IP and route packets to different internal servers based on that host header?

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• How to configure something like "Reflexive ACL" on OpenBSD?

  - by Earlz

  My U-Verse modem has something called "Reflexive ACL" described as Reflexive ACL: When IPv6 is enabled, you can enable Reflexive Access Control Lists to deny inbound IPv6 traffic unless this traffic results from returning outgoing packets (except as configured through firewall rules). This seems like a pretty good way to keep from having to maintain a firewall on each computer behind my router that gets handed an IPv6 address. It sounds about like a NAT, which for my small home network is all I want right now. Now my modem sucks as a router though, so I'm in the process of configuring an OpenBSD router to do that. I've got IPv6 supported and all that and my OpenBSD router will hand out IPv6 addresses by rtadvd. Now I want to keep people from having instant access to my local network through IPv6. How would I best do something like Reflexive ACL with pf in OpenBSD 5.0?

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• Where are SSIS Packages Saved?

  - by Chris

  I right clicked on a Database in the object explorer of SQL Server 2008 Management Studio. I went to Tasks Import Data, and imported some data from a flat text file, opting to save the package on the server. Now how the heck do I get to the package to edit or run it again? Where in SQL Server Management Studio do I go? I've expanded everything and I can't find it. It's driving me nuts.

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• configure vpn so that it is not the preferred route

  - by pstanton

  Hi all, I recently re-installed XP on my PC. I had a vpn set up on the old system and remember being advised to change one setting so that it wasn't the preferred route for all network traffic. This was ideal as only connections to the target network would be made through the vpn and all normal traffic would go through the regular path unmolested. i remember thinking "why isn't this the default setting!?". now i've formatted my drive and lost the config for that vpn (besides host, username, passwd). does anyone know of the setting i'm referring to? thanks, paul.

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• Routing based on source address in Windows Server 2008 R2

  - by rocku

  I'm implementing a direct routing load balanced solution using Windows Server 2008 R2 as back-end server. I've configured a loopback interface with the external IP address. This works, I am receiving packets with the external IP address and respond to them appropriately. However our infrastructure requires that traffic which is being load-balanced should go through a different gateway then any other traffic originating from the server, ie. updates etc. So basicly I need to route packets based on source address (external IP) to another gateway. The built-in Windows 'route' command allows routing based on destination address only. I've tried setting a default gateway on the loopback interface and mangled with weak/strong host send/receive parameters on the interfaces, however this didn't work. Is there any way around this, possibly using third party tools?

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• How SmartDNS Works

  - by Emad

  If you travel outside the US you'll notice that most of the streaming services like Netflix, Pandora, hulu etc are blocked, usually by the service providers themselves. To get around that, people use VPN services. They basically tunnel your traffic through a US server so your requests seem like they are originating in the US. These VPN services fix this blocking problem, but make your connection slower than the normal unVPNed connection. Recently however I've come across something called SmartDNS provided by overplay.net. You pay $5 a month and you get access to their DNS servers. After you change to their DNS you get access to the blocked streaming sites, without slowing down your normal traffic like email and browsing. What I'd like to know is the technical details of how this SmartDNS works. I've done some quick research but that didn't turn up anything of substance. Anybody out there knows?

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• How can I port forward over a VPN NAT?

  - by Charlie

  I have a multi-site VPN currently running with pfSense boxes and currently using OpenVPN. However I can change the OS and VPN type if need be. The main router has a 10.13.0.0/16 subnet and a series of public IPs For example, a branch has a 10.12.1.0/24 subnet How can I port forward NAT traffic on a public IP of the main router to a server behind the NAT of the second? So for instance port 95 on a public IP assigned to the main router forwards to 10.12.1.102 on the other router. Is this even possible? Currently my setup works great but only for intertnal traffic

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• Which free and open source frameworks would you recommend for replacing which aspect of ATG

  - by Vihung

  ATG (http://www.atg.com) is a frameowrk, a platform and a solution for content presentation and management, personalisation, e-commerce and customer relationship management. Which free and open source frameworks or products would you recommend to replace the basic functionality it provides? In the spirit of Stack Overflow, can you answer with one item in each answer and use the voting rather than duplicating someone else's answer. I have started with some answers

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• Restricting output to only allow localhost using iptables

  - by Dave Forgac

  I would like to restrict outbound traffic to only localhost using iptables. I already have a default DROP policy on OUTPUT and a rule REJECTing all traffic. I need to add a rule above that in the OUTPUT chain. I have seen a couple different examples for this type of rule, the most common being: -A OUTPUT -o lo -j ACCEPT and -A OUTPUT -o lo -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT Is there any reason to use the latter rather than the former? Can packets on lo have an address other than 127.0.0.1?

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• Set Up Port-Forwarding on Netgear N300 Router

  - by Smitty

  I have a Netgear N300 router that has DynDNS.org as a preset DDNS option. After setting it up it (unsurprisingly) sent traffic directly to my router. I'm essentially using this to connect remotely to my home (virtual) machine/s. From what I've read, it seems like I need to set up port forwarding. I tried forwarding "all" inbound traffic to a specific IP but that just didn't work. What am I doing wrong? Also, I just noticed I get this error after applying the settings: "The specified port(s) are being used by other configurations. Please check your configurations of Remote Management, Port forwarding, Port Triggering, UPnP Port Mapping table, RIP, and Internet connection type"

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• nginx hashing on GET parameter

  - by Sparsh Gupta

  I have two Varnish servers and I plan to add more varnish servers. I am using a nginx load balancer to divide traffic to these varnish servers. To utilize maximum RAM of each varnish server, I need that same request reaches same varnish server. Same request can be identified by one GET parameter in the request URL say 'a' In a normal code, I would do something like- (if I need to divide all traffic between 2 Varnish servers) if($arg_a % 2 == 0) { proxy_pass varnish1; } if($arg_a % 2 == 1) { proxy_pass varnish2; } This is basically doing a even / odd check on GET parameter a and then deciding which upstream pool to send the request. My question are- What is the nginx equivalent of such a code. I dont know if nginx accepts modulas Is there a better/ efficient hashing function built in with nginx (0.8.54) which I can possibly use. In future I want to add more upstream pools so I need not to change %2 to %3 %4 and so on Any other alternate way to solve this problem

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• OpenBSD Routing Problem

  - by Ozkan SENOVA

  I am running OpenBSD on a network appliance hardware. It has 5 NICs. I want to give different IP's in same subnet to 3 nics. Eg: em0: 192.168.1.5 em1: 192.168.1.90 em2: 192.168.1.56 I make the necessary configuration with ifconfig, all interfaces works as expected when all the ethernet ports are plugged in to switch. But there is something wrong in routing. If I connect to 192.16.1.5 via any service(http, smtp etc.), traffic goes over link#3. If I unpug the cable from em2 I can't reach any IP's binded on device. Is there any way to route traffic over different links in this IP configuration?

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• NETSH : Set default ip address for an interface with multiple Ips

  - by elarichi.y

  To test a load balancer I need to switch my ip address several time a day, and keep other ips routing trough other Wans. I run these commands in a batch script: netsh interface ip set address "Connexion au réseau local" static %ipd% 255.255.255.0 192.168.1.1 1 netsh in ip add address "Connexion au réseau local" %ips1% 255.255.255.0 netsh in ip add address "Connexion au réseau local" %ips2% 255.255.255.0 ipd: is the default ip I want to set (all traffic should go trough it). ips1 and ips2 : are the secondary ips I want to keep but what ever I do all traffic goes trough one IP !! (first one in the range) Please help me with this issue.

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• Load balancers, multiple data centers and url based routing

  - by kunkunur

  There is one data center - dc1. There is a business need to setup another data center - dc2 in another geography and there might be more in the future say dc3. Within the data center dc1: There are two web servers say WS1 and WS2. These two webservers do not share anything currently. There isnt any necessity foreseen to have more webservers within each dc. dc1 also has a local load balancer which has been setup with session stickiness. So if a user say u1 lands on dc1 and if the load balancer decides to route his first request to WS1 then from there on all u1's requests will get routed to WS1. Local load balancer and webservers are invisible to the user. Local load balancer listens to the traffic on a virtual ip which is assigned to the virtual cluster of webservers ws1 and ws2. Virtual ip is the ip to which the host name is resolved to in the DNS. There are no client specific subdomains as of now instead there is a client specific url(context). ex: www.example.com/client1 and www.example.com/client2. Given above when dc2 is onboarded I want to route the traffic between dc1 and dc2 based on the client. The options that I have found so far are. Have client specific subdomains e.g. client1.example.com and client2.example.com and assign each of them with the virtual ip of the data center to which I want to route them. or Assign www.example.com and www1.example.com to first dc i.e. dc1 and assign www2.example.com to dc2. All requests will first get routed to dc1 where WS1 and WS2 will redirect the user to www1.example.com or www2.example.com based on whether the url ends with /client1 or /client2. I need help in the following If I setup a global load balancer between dc1 and dc2 do I have any alternative solutions. That is, can a global load balancer route the traffic based on the url ? Are there drawbacks to subdomain based solutions compared to www1 solution? With www1 solution I am worried that it creates a dependency on dc1 atleast for the first request and the user will see that he is getting redirected to a different url.

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• What's the best way to get to know linux or BSD kernel internals?

  - by Michal Piaskowski

  I'd like to gain better knowledge of operating system internals. Process management, memory management, and stuff like that. I was thinking of learning by getting to know either linux or BSD kernel. Which one kernel is better for learning purposes? What's the best place to start? Can you recommend any good books?

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• Badwidth-Hogging Linux Server Causing Trouble

  - by BlairHippo

  We have a Linux server (2.6.28-11-generic #42-Ubuntu) that's misbehaving on a client site, gobbling up an entirely unacceptable percentage of the client's bandwidth, and we're trying to figure out what the heck it's doing. And the guy who had the sysadmin skillset has yet to be replaced. We're at a loss for what could be causing all that network traffic, and need to figure it out SOON. What log files should I be looking at to find this information? What analysis tools would you recommend for this task? Please note that I'm not looking for a tool that will allow me to analyze FUTURE traffic. The client is on the verge of shutting the machine off entirely; I need to figure out what it's been doing with the data I already have, if that's at all possible. My thanks in advance for helping a development monkey play sysadmin.

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• Routing between 2 different subnets on 2 different interfaces in SonicOS

  - by Chris1499

  I'm having a bit of a problem allowing traffic between two of my subnets. Here's the structure I've built. The X0 interface has our windows server on it and it handles DHCP/DNS, etc. X1 has the WAN connection. The Sonicwall is handling DHCP on X2. The X3 interface is connected to a different vlan on the 48 port switch. The Sonicwall is handling DHCP on this network as well. So here's what i want to do. The network on X2 is for our guest wireless; i don't want it to be able to access any of the other networks, just the internet, so i that all blocked in the firewall. No issues there. The X3 network is going to be for programmable controllers, and needs to be able to access the X0 network where our computers are. This is where my problem is. I'm not able to get between the 192.168.2.xxx and the 192.168.1.xxx on interfaces X0 and X3 respectively. I have these rules set up in the firewall. The Lan Primary Subnet is the 192.168.2.0 on X0. So if i'm not mistaken, this will allow traffic between the two through the firewall. Now this is where I'm a little confused. Do i need to use NAT to get the traffic from X0 to go to X3 (and vice versa), or a static route, or both? Currently i have both, though i doubt they're done correctly (also in screenshot). I've tried to ping between the two without luck. Any advice, or if you see what's wrong with my setup, is much appreciated. If you need some more information, let me know. Thanks all! EDIT: So i found that i don't neither either NAT or a static route, that the setting in the firewall is enough. I can now ping from the 192.168.1.xxx network, however i can't access the server on the 192.168.2.xxx network. When i try to access i get "An error occured while reconnecting to Z: to server Microsoft Windows Network: The local device name is already in use. This connection has not been restored. What am i missing?

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