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• Rate-Limit affects All clients or single IP?

  - by Asad Moeen

  Well up-til now I've considered iptables rate-limit commands with the "recent" module to work for each IP Address. For example rate-limit rule of 20k/s will trigger only if a single IP exceeds 20k/s rate and not if 4 different IPs exceed 5k/s rate. Please correct me if I considered this wrong as I've only used these rules for TCP/ UDP. But today I tried similar rules for ICMP and applied 4/s Input/Output. But then on trying to ping-test from just-ping.com I could see packet loss on almost all IP Addresses. How could that happen because if it worked for each IP Address then it wouldn't be triggering the rule because I believe each IP from just-ping has a rate of probably 1/s. I still think the first one is true because if it wasn't then my GameServer would block everyone if the combined rate ( in case of more connected players ) increased the threshold. This hasn't happened up til now so the ICMP thing really confused me. Thank you.

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• Weird routing problems with VPN

  - by Borek

  In our VPN setup I have to add a route to my routing table like this: route add 1.2.3.0 mask 255.255.255.0 172.16.1.1 -p Our internal addresses 1.2.3.x then use 172.16.1.1 as their gateway and both my local internet and work VPN can work at the same time. However, when I disconnect from VPN and reconnect again, I can't ping our servers even though the connection status is "Connected". When I do route print my previously added route is listed but it doesn't seem to work. So I try to execute that 'route add' command again and as expected, it tells me that The route addition failed: The object already exists. But - and that's the point - when I now try to ping our servers again, everything works! So every time, I have to execute this route add command that will fail but fix the issue at the same time. Any ideas what I might be doing wrong? My PC is Windows 7 x64, I am Administrator, UAC is enabled and the command prompt is run with elevated privileges.

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• Preventing Email Spoofing

  - by DT

  I use Google Apps with my domain. Recently, we have begun to receive spam that gets past Google's spam filters. They are from our own email addresses. I am wondering how to prevent this kind of email spoofing. We use an SPF record with the "~all" setting. I'm wondering if I can upgrade that to "-all". However, Google Apps recommends against it. Also, I'm not 100% sure that our SPF record is complete. Any suggestions? Thank you ever so much.

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• How do I backup Firefox add-on like "Fastdial" addon for a reinstall?

  - by danacon

  I am doing a new install of Firefox and over the years my Windows "roaming folder" I use for backup has gotten all clogged up from so many add-ons and crap... I want to backup just a couple Firefox add-on's, one is "Fast dial" How do I backup this add-on and its addresses for when I reinstall Firefox and the add-on, so It will go back to where it is now? Most add-on's have a backup feature like "too many tabs" bookmarks and such but fast dial doesn't? so How do I backup this add-on? and /or addons like it without a backup feature? Thanks in advance any help or options would be a big help. Dana

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• Tomcat and IIS6 on one server, multiple websites

  - by Rafe

  Windows Server 2003 with IIS6 and Tomcat 6.0.26. Three sites running on this server. One is PHP, one is ASP and the third uses Tomcat. The first two work flawlessly. The third is being a pain. Tomcat is installed and if called on the server itself by IP address xxx.xxx.xxx.xxx:8080 shows the welcome page. Calling the same address from an external machine gives a 'could not connect' error. Calling the ip address from within the server on standard port 80 gives me an error 324 (net::ERR_EMPTY_RESPONSE). Have tried using httpcfg to force listening only on ports within the ip range I'm using in a manner similar to question 35650 located here on serverfault but with no success. There are actually ten ip addresses on this machine but I'm only using three of them at this point. Any pointers on troubleshooting this would be appreciated!

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• How do I backup Firefox add-on like "Fastdial" addon for a reinstall?

  - by danacon

  I am doing a new install of Firefox and over the years my Windows "roaming folder" I use for backup has gotten all clogged up from so many add-ons and crap... I want to backup just a couple Firefox add-on's, one is "Fast dial" How do I backup this add-on and its addresses for when I reinstall Firefox and the add-on, so It will go back to where it is now? Most add-on's have a backup feature like "too many tabs" bookmarks and such but fast dial doesn't? so How do I backup this add-on? and /or addons like it without a backup feature? Thanks in advance any help or options would be a big help. Dana

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• SNMPD - passing values in a trap

  - by ethrbunny

  Im trying to create an SNMP setup to monitor 500-1K machines. Each will be joined to the SNMPTRAPD server via a VPN. When the client system sends its messages, it's sending its internal address instead of the VPN address even though the 'trapsync' command is using the VPN. This will be a problem as many of these system will have DHCP addresses based on location so there will be overlap. What I'd like to figure out is how to pass extra values with the trap so I can identify which system a given trap comes from.

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• Why should I use Firewall Zones and not just Address Objects?

  - by SRobertJames

  I appreciate Firewall Address Objects and Address Groups - they simplify management by letting me give a name to a group of addresses. But I don't understand what Firewall Zones (LAN, WAN, DMZ, etc.) do for me over Address Groups. I know all firewalls have them, so there must be a good reason. But what do I gain by stating a rule applies to all traffic from LAN Zone to WAN Zone which comes from LAN Address Group to WAN Address Group? Why not just mention the Address Groups?

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• Implementing Variable Envelope Return Path (VERP) using Exchange

  - by iammichael

  We're looking into implementing Variable Envelope Return Path (VERP) for improved bounce processing for our application. Our current mail infrastructure is MS Exchange 2007 but are in the process of upgrading to 2010. We're also implementing Postini for spam filtering. Exchange doesn't support sub-addressing (see also this question on disposable addresses) -- and VERP is somewhat of a specialized application of sub-addressing. Are there any options for implementing VERP in Exchange without putting another non-Exchange SMTP relay in front of Exchange to pre-process incoming messages? Specifically could a transport rule be created that could match against the target (non-existing) recipient, store that recipient address in a special header added to the message, and redirect the message to a pre-created mailbox? Note: we have developer resources available if custom code could be used somehow.

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• Virtual DNS recommended setup...

  - by luison

  Hi. We are new to virtualization which we are setting up with Proxmox VE (OpenVZ + KVM). I am a bit lost about the recommended DNS forwarder config specially in the OpenVZ (Virtuosso type) of enviroiment. Our intention was to have a small dnsmasq running in one of the VM acting as backup DHCP server and serving our in-office local addresses (and PCs) by an additional resolve.conf file which dnsmasq supports, but I've read that all VM should share DNS pointing to the host machine in which case it would make more sense having it there. My problem is that I would like to have as least as possible apps in the host so a reinstall of the environment (porxmox ve) and a machine restore can be as quick as possible. Does anyone have a similar setup? Does it make sense to have the 1st virtual machine running the local dns forwarder? Also... dnsmasq seems to want to have root permissions when running on an OpenVZ container... are there any work arrounds anyone knows for that.

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• Using standard e-mail address as user system wide name

  - by PeterMmm

  I'm going to re-build a very old Lotus Notes infrastructure coming from 4.x towards 8.5. I'm trying to setup Domino so that all user names should be of a single string or the internet e-mail address. For example the user "John Smith/ACME" should be in the whole system jsmith or [email protected] . I still get jsmith/ACME all around. Where it is most annoying is in the NAB when creating a new message. Is there a way to get all addresses in uniform standard e-mail adress format at least in mail ? The mixup in the destination like "John Smith/ACME, [email protected]" confused the users.

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• Shortcut key to forward email to fixed email address in Postbox

  - by Jos v.d. Voort v.d. Kleij

  As an avid user of todo apps (currently Asana) is very much miss a way to easily forward an email from Postbox to my GTD app. Currently the workflow is: Click cmd/L to open the forward email window Type [email protected] in the To: address field Click the send button in the forward email window What I would like to have is an automator or applescript that does that for me. Ex: Highligh/select the mail I wish to convert to a task in Asana and the type a shortcut like ctrl/cmd/L to forward the mail to Asana. As most todo apps have custom email addresses you can use to convert an email into a task, the only thing that needs to be changed is the email address in the script. For Asana this would not be necessary because the email address for converting an email into a taks is the same for all Asana users.

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• Forwarding emails from a domain

  - by Euwyn

  I generally use Google Apps to handle email domains. I'm unfortunately stuck in an infinite loop with Google [1] for one the domains I recently picked up. Right now I use Zerigo's awesome DNS services. How can I get [email protected] forwarded to my Gmail account? Better yet if this is a free/cheap solution and can work with multiple aliases going to different real email addresses ([email protected] - [email protected], [email protected] - [email protected]) [1] Long story. I alternate between "Sorry, you've reached a login page for a domain that isn't using Google Apps." and "This domain has already been registered with Google Apps." Seems like many others are having this issue and Google isn't doing anything about it.

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• Email forwarding via spf record

  - by Y.G.J

  I have old-domain.co.il with several emails and a new-domain.co.il with the same email addresses. I don't want to connect my domain to a server via mx to make that transfer via email server. Is it possible to have a SPF record that get an email like [email protected] and transfer it to [email protected]? The new domain is on google apps and the old domain can be connected to the same apps, but how to do it, so emails will arrive only to the new one?

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• Thomson TG585v7 router - promiscuous mode

  - by Nikita

  I have a TG585v7 as a router with several machines plugged into it. In the default setup, the packets are only delivered to the specific machine but I want to be able to setup to monitor all network traffic on one of the machines, i.e. I need those packets to be picked up when my ethernet card is in promiscuous mode. Is this possible? Guide here has this "mcastpromisc Make the IP interface multicast promiscuous. OPTIONAL", is this what I am looking for? Does it mean I need to manually add all my machines by their MAC addresses to be able to receive packets destined for them? Or am I out of luck and I need to get a better router?

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• CARP: two machines think they're the master, but only on one interface

  - by Conor McDermottroe

  I have two machines, each configured identically as a firewall/load balancer for a busy website. I have set them up with CARP and pfsync on both the internal and external interfaces. The internal interface is behaving as expected (primary listed as MASTER and secondary listed as BACKUP) On both machines, the network interfaces are as follows: em0 - External interface bge0 - Internal interface bge1 - Crossover connection between both machines carp0 - Shared external interface for CARP carp1 - Shared internal interface for CARP I've rewritten the IP addresses and MAC addresses below. The networks are as follows: 10.0.1.0/24 - External network 10.0.2.0/24 - Internal network 10.0.3.0/24 - Crossover network Here's the output from ifconfig on the primary: em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4> ether [SNIP] inet 10.0.1.10 netmask 0xffffff00 broadcast 10.0.1.255 media: Ethernet 100baseTX <full-duplex> status: active bge0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM> ether [SNIP] inet 10.0.2.10 netmask 0xffffff00 broadcast 10.0.2.255 media: Ethernet 1000baseT <full-duplex> status: active bge1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM> ether [SNIP] inet 10.0.3.10 netmask 0xffffff00 broadcast 10.0.3.255 media: Ethernet 1000baseT <full-duplex> status: active lo0: flags=80c9<UP,LOOPBACK,RUNNING,NOARP,MULTICAST> metric 0 mtu 16384 options=3<RXCSUM,TXCSUM> inet6 fe80::1%lo0 prefixlen 64 scopeid 0x4 inet6 ::1 prefixlen 128 inet 127.0.0.1 netmask 0xff000000 pflog0: flags=141<UP,RUNNING,PROMISC> metric 0 mtu 33152 pfsync0: flags=0<> metric 0 mtu 1460 pfsync: syncdev: bge1 syncpeer: 10.0.3.11 maxupd: 128 carp0: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500 inet 10.0.1.5 netmask 0xffffff00 carp: MASTER vhid 1 advbase 1 advskew 0 carp1: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500 inet 10.0.2.5 netmask 0xffffff00 carp: MASTER vhid 2 advbase 1 advskew 0 And here's the /etc/rc.conf excerpt from the primary: defaultrouter="10.0.1.1" network_interfaces="em0 bge0 bge1 lo0 pfsync0" cloned_interfaces="carp0 carp1" ifconfig_em0="inet 10.0.1.10 netmask 255.255.255.0 media 100BaseTX mediaopt full-duplex" ifconfig_bge0="inet 10.0.2.10 netmask 255.255.255.0 media 1000BaseTX mediaopt full-duplex" ifconfig_bge1="inet 10.0.3.10 netmask 255.255.255.0 media 1000BaseTX mediaopt full-duplex" ifconfig_carp0="vhid 1 pass [SNIP] 10.0.1.5/24" ifconfig_carp1="vhid 2 pass [SNIP] 10.0.2.5/24" pfsync_enable="YES" pfsync_syncdev="bge1" pfsync_syncpeer="10.0.3.11" And here's the output on the secondary: em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4> ether [SNIP] inet 10.0.1.11 netmask 0xffffff00 broadcast 10.0.1.255 media: Ethernet 100baseTX <full-duplex> status: active bge0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM> ether [SNIP] inet 10.0.2.11 netmask 0xffffff00 broadcast 10.0.2.255 media: Ethernet 1000baseT <full-duplex> status: active bge1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM> ether [SNIP] inet 10.0.3.11 netmask 0xffffff00 broadcast 10.0.3.255 media: Ethernet 1000baseT <full-duplex> status: active lo0: flags=80c9<UP,LOOPBACK,RUNNING,NOARP,MULTICAST> metric 0 mtu 16384 options=3<RXCSUM,TXCSUM> inet6 fe80::1%lo0 prefixlen 64 scopeid 0x4 inet6 ::1 prefixlen 128 inet 127.0.0.1 netmask 0xff000000 pflog0: flags=141<UP,RUNNING,PROMISC> metric 0 mtu 33152 pfsync0: flags=0<> metric 0 mtu 1460 pfsync: syncdev: bge1 syncpeer: 10.0.3.10 maxupd: 128 carp0: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500 inet 10.0.1.5 netmask 0xffffff00 carp: MASTER vhid 1 advbase 1 advskew 20 carp1: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500 inet 10.0.2.5 netmask 0xffffff00 carp: BACKUP vhid 2 advbase 1 advskew 20 And here's the /etc/rc.conf excerpt from the secondary: defaultrouter="10.0.1.1" network_interfaces="em0 bge0 bge1 lo0 pfsync0" cloned_interfaces="carp0 carp1" ifconfig_em0="inet 10.0.1.11 netmask 255.255.255.0 media 100BaseTX mediaopt full-duplex" ifconfig_bge0="inet 10.0.2.11 netmask 255.255.255.0 media 1000BaseTX mediaopt full-duplex" ifconfig_bge1="inet 10.0.3.11 netmask 255.255.255.0 media 1000BaseTX mediaopt full-duplex" ifconfig_carp0="vhid 1 pass [SNIP] advskew 20 10.0.1.5/24" ifconfig_carp1="vhid 2 pass [SNIP] advskew 20 10.0.2.5/24" pfsync_enable="YES" pfsync_syncdev="bge1" pfsync_syncpeer="10.0.3.10" What I don't understand is, the carp status on carp0 is MASTER on both machines when the status on carp1 is as it should be (MASTER on the primary and BACKUP on the secondary). What am I missing? Where should I be looking for clues?

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• HOWTO Catch/Redirect all outgoing e-mails on Win2K and Redhat Enterprise

  - by John

  Background: I am integrating two separate web application that are developed in ASP .NET and JSP/Struts. As such, they are hosted on two different server technologies, namely Win2K3 and Redhat Enterprise Server 5.5. Problem: There is a copy of production data in my test environment with real e-mail addresses. I need to test the e-mail functionality of these applications, but I do not want them to send out actual e-mails. Is there a way to catch and redirect all outgoing e-mails? Ideally, I would like to send all outgoing e-mails to another e-mail (i.e., [email protected]) so my testers can look at them. Thanks for the help in advance!

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• Netinstalling CentOS if the gateway is in a different subnet

  - by James Lawrie

  I have a KVM host (A) running a virtual machine (B). They each have their own external IP address and the networking is setup using bridging between eth0 and br0 on A. B uses eth0, with A being the gateway. The problem is that the two external IP addresses are on different subnets (different /8s in fact) so by default, B claims it cannot reach A (Network Unreachable). I can resolve this by adding a static route on B: echo "any host gateway_ip dev eth0" > /etc/sysconfig/static-routes Modifying /etc/init.d/networking to reload the gateway after applying static routes (I only added the final line before fi): if [ -f /etc/sysconfig/static-routes ]; then grep "^any" /etc/sysconfig/static-routes | while read ignore args ; do /sbin/route add -$args done route add default gw "${GATEWAY}" fi If I then restart networking, it comes online. How can I do this (or work around it some other way) prior to the system being installed, ideally inside an Anaconda kickstart file?

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• Personal DNS server and fallback outside home

  - by Jens

  I have my own DNS server at home to access local names, and that is working fine. Then I have my laptop, now obviously my laptop leaves the home now and then, therefore it accesses different nets outside my home, and my DNS server is not accessible there... So I figured that I would just add Google as secondary DNS... But actually, when I do that, then suddenly I can't access my local stuff (at home that is, obviously), like my laptop is getting a quicker response from Google's DNS or something, because it can't find anything on the addresses I use locally. If I then remove the secondary DNS, and keeps my own, then it works fine again... So do I somehow need to seperate what DNS's to use on what nets? I already use sepperate DNS settings when I connect using my 3G modem, but when I use hotspots it seems to use the same settings regardless (at least in the train), also can it differ wired connections?... Is there another solution?

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• HP Blade ILO not responding in chassis ILO

  - by bobinabottle

  I have just started at a new company and I am inspecting their current server config. The HP 480c blades in a c7000 chassis aren't responding to ILO, although the chassis ILO is working fine. I have a feeling the last sysadmin configured the blades ILO as static IPs and it is not responding correctly. The servers are sitting in a datacenter and I'm hoping to be able to fix this remotely. Is there a way that I can change the ILO static IPs for the blades remotely? If not and I do have to go onsite, how do I change the IP addresses of the ILO for the blades? (Sorry I'm not very familiar with HP servers) thanks for you help!

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• Does Dynamic DNS require separate subdomains?

  - by kce

  Hello. I have a functioning DHCP/DNS (ISC Bind 9.6, DHCP 3.1.1) server running on Debian that I would like to add DynamicDNS functionality to. I have a pretty simple question: Does DynamicDNS require (or recommend) separate sub-domains? I have seen a few tutorials where the the clients that are acquiring their IP addresses and other networking information via DHCP are on a different sub-domain as the servers which are statically configured (both in terms of IP, and DNS). For example: All the clients are on ws.example.org and the servers on example.org. Right now all of our servers and clients are in the same domain (example.org) but spread across different zone files (because we have multiple subnets). The clients are configured with DHCP and the servers are configured statically. If I want to setup DynamicDNS for the clients should I use a separate sub-domain? What's the best practice here (and why or why not would it be a bad idea to do otherwise)? Thanks.

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• RewriteCond in .htaccess file gives me bad flag delimiters

  - by Steven

  I'm upgrading a website and I use this .htaccess file to show maintenance page: #MAINTENANCE-PAGE REDIRECT RewriteEngine on RewriteCond %{REMOTE_ADDR} !^127\.0\.0\.0 # Bogus IP address for posting here RewriteCond %{REMOTE_ADDR} !^127\.0\.0\.0 # Bogus IP address for posting here RewriteCond %{REQUEST_URI} !^/maintenance\.html$ RewriteRule ^(.*)$ http://www.mysite.no/maintenance.html [R=307,L] This opens the maintenance page for all users except the two IP addresses I've added. They get an Internal Server Error. I've used thesame script on another site, and that worked fine. Looking at the error log, I see the following: /var/www/vhosts/mysite.no/httpdocs/.htaccess: RewriteCond: bad flag delimiters If I remove my .htaccess file, I can work with my site just fine. My site is hosted on a VPN using CentOS 5. How can I fix this problem?

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• Weighted round robins via TTL - possible?

  - by Joe Hopfgartner

  I currently use DNS round robin for load balancing, which works great. The records look like this (I have a ttl of 120 seconds) ;; ANSWER SECTION: orion.2x.to. 116 IN A 80.237.201.41 orion.2x.to. 116 IN A 87.230.54.12 orion.2x.to. 116 IN A 87.230.100.10 orion.2x.to. 116 IN A 87.230.51.65 I learned that not every ISP / device treats such a response the same way. For example some DNS servers rotate the addresses randomly or always cycle them through. Some just propagate the first entry, others try to determine which is best (regionally near) by looking at the ip address. However if the userbase is big enough (spreads over multiple ISPs etc) it balances pretty well. The discrepancies from highest to lowest loaded server hardly every exceeds 15%. However now I have the problem that I am introducing more servers into the systems, that not all have the same capacities. I currently only have 1gbps servers, but I want to work with 100mbit and also 10gbps servers too. So what I want is I want to introduce a server with 10 GBps with a weight of 100, a 1 gbps server with a weight of 10 and a 100 mbit server with a weight of 1. I used to add servers twice to bring more traffic to them (which worked nice. the bandwidth doubled almost.) But adding a 10gbit server 100 times to DNS is a bit rediculous. So I thought about using the TTL. If I give server A 240 seconds ttl and server B only 120 seconds (which is about about the minimum to use for round robin, as a lot of dns servers set to 120 if a lower ttl is specified.. so i have heard) I think something like this should occour in an ideal scenario: first 120 seconds 50% of requests get server A -> keep it for 240 seconds. 50% of requests get server B -> keep it for 120 seconds second 120 seconds 50% of requests still have server A cached -> keep it for another 120 seconds. 25% of requests get server A -> keep it for 240 seconds 25% of requests get server B -> keep it for 120 seconds third 120 seconds 25% will get server A (from the 50% of Server A that now expired) -> cache 240 sec 25% will get server B (from the 50% of Server A that now expired) -> cache 120 sec 25% will have server A cached for another 120 seconds 12.5% will get server B (from the 25% of server B that now expired) -> cache 120sec 12.5% will get server A (from the 25% of server B that now expired) -> cache 240 sec fourth 120 seconds 25% will have server A cached -> cache for another 120 secs 12.5% will get server A (from the 25% of b that now expired) -> cache 240 secs 12.5% will get server B (from the 25% of b that now expired) -> cache 120 secs 12.5% will get server A (from the 25% of a that now expired) -> cache 240 secs 12.5% will get server B (from the 25% of a that now expired) -> cache 120 secs 6.25% will get server A (from the 12.5% of b that now expired) -> cache 240 secs 6.25% will get server B (from the 12.5% of b that now expired) -> cache 120 secs 12.5% will have server A cached -> cache another 120 secs ... i think i lost something at this point but i think you get the idea.... As you can see this gets pretty complicated to predict and it will for sure not work out like this in practice. But it should definitely have an effect on the distribution! I know that weighted round robin exists and is just controlled by the root server. It just cycles through dns records when responding and returns dns records with a set propability that corresponds to the weighting. My DNS server does not support this, and my requirements are not that precise. If it doesnt weight perfectly its okay, but it should go into the right direction. I think using the TTL field could be a more elegant and easier solution - and it deosnt require a dns server that controls this dynamically, which saves resources - which is in my opinion the whole point of dns load balancing vs hardware load balancers. My question now is... are there any best prectices / methos / rules of thumb to weight round robin distribution using the TTL attribute of DNS records? Edit: The system is a forward proxy server system. The amount of Bandwidth (not requests) exceeds what one single server with ethernet can handle. So I need a balancing solution that distributes the bandwidth to several servers. Are there any alternative methods than using DNS? Of course I can use a load balancer with fibre channel etc, but the costs are rediciulous and it also increases only the width of the bottleneck and does not eliminate it. The only thing i can think of are anycast (is it anycast or multicast?) ip addresses, but I don't have the means to set up such a system.

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• Amazon EC2 SQL Server Connection

  - by cnxmax

  I have two instances running on Amazon AWS EC2. One is running MSSQL Server 2005, the other is running a web application. I CAN connect to the database in my app using a connection string that references the Public IP of my EC2 instance running SQL Server. I CANNOT connect from the web app server if I change the connection string to reference the database servers Private IP Address. But I can connect if I run that same code on the database server itself. I can remote desktop from the app server to the database server using the private IP. I have a feeling there is something in my SQL Sever configuration that is preventing this remote connection. I have remote connections enabled, I have it set to listen on all IP addresses. Any ideas? Other things I've done: - Added exceptions to Windows Firewall - Tried connecting to using EC2 DNS Names

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• Configure Windows Routes for VPN

  - by Florin Sabau

  I have a Virtual PC/VMWare machine that runs Windows Server 2003. This virtual machine uses an IPSec VPN client program to connect to a remote network. I configured the virtual machine to have 2 NICs: NAT - to be used by the VPN Client to access the remote network Host only - to be able to access the virtual machine from the host The reason I have this setup is because I want to be able to access some remote network from the host machine. I could've installed the VPN client on the host machine, but the host runs Windows 7 and the client doesn't support it. The problem: although the virtual machine is normally reachable (ping + http access), as soon as the VPN client is started, neither of the NIC addresses are reachable anymore. I'm wondering if it is a routing problem that needs to be addressed? How do routing/VPN client connection affect the ability of the server to respond to client requests from the host?

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