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• Can't remove route from routing table

  - by anon

  (I am on Windows Server 2003.) I see a couple of unusual entries in my routing table that I would like to remove: Network Destination Netmask Gateway Interface Metric XXX.27.44.1 255.255.255.255 127.0.0.1 127.0.0.1 20 XXX.27.255.255 255.255.255.255 XXX.27.44.1 XXX.27.44.1 20 All the "XXX"'s are the same octet. I would strongly prefer NOT to clear the routing table, since this is a production server. Here is what I've tried: route delete XXX.27.44.1 The route specified was not found. route delete XXX.27.44.1 mask 255.255.255.255 127.0.0.1 metric 20 The route specified was not found. route delete XXX.27.255.255 The route specified was not found. route delete XXX.27.255.255 mask 255.255.255.255 XXX.27.44.1 metric 20 The route specified was not found. I also tried adding the routes in hopes that I could delete them: route add XXX.27.44.1 mask 255.255.255.255 127.0.0.1 metric 20 The route addition failed: The parameter is incorrect. route add XXX.27.255.255 mask 255.255.255.255 XXX.27.44.1 metric 20 The route addition failed: The parameter is incorrect. Bonus question: What do these entries do, and how did they get there?

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• How to sync two computers using new MobileMe calendar

  - by CesarGon

  I have been using MobileMe for over a year with success. I use it to sync my Outlook calendars in my work and home computers, using Windows 7 and Outlook 2007. The main Outlook calendar folder in my work computer is replicated to MobileMe as "Work", and synced to my home computer, and the main calendar folder in my home computer is replicated to MobileMe as "Home", and synced to my work computer. This means that I can see both "Work" and "Home" calendars from both computers (as well as from the web interface through me.com), which is very convenient. Yesterday I migrated to the new MobileMe calendar, accepting the suggestion that popped up on the me.com website. After the migration, the MobileMe control panel on each of Windows computers asked me to re-configure my calendar setup, and everything fell apart. The "Home" and "Work" calendar folders in Outlook are now ignored by MobileMe, and new ones named "Home in MobileMe" and "Work in MobileMe" have been created, and placed in a separate Outlook data file rather than the default. This means that now: I now have four folders, two of which are not replicated to MobileMe The two folders that are not replicated reside on a separate data file, so alarms and reminders don't work; they're basically useless to me as calendar folders In addition, the button in the MobileMe Control Panel that used to let me specify what MobileMe folder should be synced against the default Outlook folder has gone. MobileMe is now too smart. Do you have any idea how to undo this mess and go back to a situation where I have two folders, as described in the top paragraph, which keep synced? I don't want an extra data file. Thanks.

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• NTOP gives warnings on startup

  - by FR6

  I just installed ntop 1.4.4 and when I start it, it give me infinite warnings "packet truncated": ... RRD_DEBUG: umask 0066 RRD_DEBUG: DirPerms 0700 THREADMGMT: RRD: Started thread (t2992630672) for data collection THREADMGMT[t2992630672]: RRD: Data collection thread starting [p30923] INIT: Created pid file (/var/run/ntop.pid) THREADMGMT[t3086329552]: ntop RUNSTATE: INITNONROOT(3) Now running as requested user 'nobody' (99:99) Note: Reporting device initally set to 0 [eth0] (merged) THREADMGMT[t3086329552]: ntop RUNSTATE: RUN(4) THREADMGMT[t2982140816]: NPS(1): Started thread for network packet sniffing [eth0] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread starting [p30923] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread running [p30923] THREADMGMT[t3047009168]: SIH: Idle host scan thread running [p30923] THREADMGMT[t3057499024]: SFP: Fingerprint scan thread running [p30923] **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (10274->8232) **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (8814->8232) ... Do I need to configure something? I tried to access the web interface (http://localhost:3000) but it does not work. Note: I'm on CentOS. EDIT: Not sure if it helps but there is my "ifconfig": eth0 Link encap:Ethernet HWaddr 00:16:76:BC:7E:77 inet addr:192.168.0.221 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::216:76ff:febc:7e77/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15496640 errors:0 dropped:0 overruns:0 frame:0 TX packets:19256813 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:836230629 (797.4 MiB) TX bytes:608496148 (580.3 MiB) Memory:dffe0000-e0000000

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• Securely executing system commands as sudo from PHP

  - by Aydin Hassan

  Is it possible? I have written a command line tool in PHP for creating new environments for our company. It creates system users, directories, databases, VHosts and restarts apache, amongst other things. These commands require sudo privileges. I thought it might be a nice idea to have a web-interface for it, to make it easier for other non-developers to use. The web app would be behind authentication. When running from the command line I just run sudo tool.php, obviously I can't do this from a web app. How could I do this securely? Giving the apache user sudo access seems silly, as this would means all sites hosted on the box (eg all our environments) would have sudo access. Is it possible to make this tool run under a different user? this user could have sudo privileges for only the commands I need? How do things like plesk and cPanel do this? Any thoughts?

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• Appears to be "randomly" switching between the acl matched backend and the default backend

  - by Xoor

  I have HAProxy acting as a proxy in front of: An NGinx instance An in-house load balancer in front of multiple dynamic services exposed with socket.io (websockets) My problem is that from time to time my connections are proxied correctly to my socket.io cluster, and then randomly it fallsback to routing to NGinx which obviously is annoying and meaningless since NGinx isn't mean't to handle the request. This happens when requesting for URLs of the format : http://mydomain.com/backends/* There's an ACL in the HAProxy config to match the '/backends/*' path. Here's a simplified version of my HAProxy config (removed extra unrelated entries and changed names): global daemon maxconn 4096 user haproxy group haproxy nbproc 4 defaults mode http timeout server 86400000 timeout connect 5000 log global #this frontend interface receives the incoming http requests frontend http-in mode http #process all requests made on port 80 bind *:80 #set a large timeout for websockets timeout client 86400000 # Default Backend default_backend www_backend # Loadfire (socket cluster) acl is_loadfire_backends path_beg /backends use_backend loadfire_backend if is_loadfire_backends # NGinx backend backend www_backend server www_nginx localhost:12346 maxconn 1024 # Loadfire backend backend loadfire_backend option forwardfor # This sets X-Forwarded-For option httpclose server loadfire localhost:7101 maxconn 2048 It's really quite confusing for me why the behaviour appears to be "random", since being hard to reproduce it's hard to debug. I appreciate any insight on this.

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• weird routes automatically being added to windows routing table

  - by simon

  On our windows 2003 domain, with XP clients, we have started seeing routes appearing in the routing tables on both the servers and the clients. The route is a /32 for another computer on the domain. The route gets added when one windows computer connects to another computer and needs to authenticate. For example, if computer A with ip 10.0.1.5/24 browses the c: drive of computer B with ip 10.0.2.5/24, a static route will get added on computer B like so: dest netmask gateway interface 10.0.1.5 255.255.255.255 10.0.2.1 10.0.2.5 This also happens on windows authenticated SQL server connections. It does not happen when computers A and B are on the same subnet. None of the servers have RIP or any other routing protocols enabled, and there are no batch files etc setting routes automatically. There is another windows domain that we manage with a near identical configuration that is not exhibiting this behaviour. The only difference with this domain is that it is not up to date with its patches. Is this meant to be happening? Has anyone else seen this? Why is it needed when I have perfectly good default gateways set on all the computers on the domain?!

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• Does NetworkSolutions have a good DNS service?

  - by joxl

  I'm recovering from a DNS disaster and I need some good advice on an alternate solution. My company owns a domain name through NetworkSolutions. Our website is hosted by another company who also maintains our DNS records. Our email is hosted by Google Apps, and the MX records are maintained through the afore-mentioned website/DNS host. Yesterday our website/DNS host had a serious hiccup in some software and completely overwrote all of our DNS records with invalid values; successfully pointing our domain and MX records at the wrong servers. Unfortunately it wasn't caught until it had time to significantly propagate. On top of that, it wasn't fixed until several hours later, combine that with a long TTL on the records; we have customers who are still bouncing emails. Anyhow, I am now completely terrified of this company's ability to do a good job, so I am considering switching to NetworkSolutions for our DNS service. I need the ability to configure A, CNAME, MX, and TXT records, preferably with a nice user interface (our current provider has a poor UI and doesn't support TXT records). Is NetworkSolutions a recommended DNS host? I am a little biased in their direction because the service will be free since we already pay them for our domain name. However I'm curious what others have experienced with their service.

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• TCP: Address already in use exception - possible causes for client port? NO PORT EXHAUSTION

  - by TomTom

  Hello, stupid problem. I get those from a client connecting to a server. Sadly, the setup is complicated making debugging complex - and we run out of options. The environment: *Client/Server system, both running on the same machine. The client is actually a service doing some database manipulation at specific times. * The cnonection comes from C# going through OleDb to an EasySoft JDBC driver to a custom written JDBC server that then hosts logic in C++. Yeah, compelx - but the third party supplier decided to expose the extension mechanisms for their server through a JDBC interface. Not a lot can be done here ;) The Symptom: At (ir)regular intervals we get a "Address already in use: connect" told from the JDBC driver. They seem to come from one particular service we run. Now, I did read all the stuff about port exhaustion. This is why we have a little tool running now that counts ports and their states every minute. Last time this happened, we had an astonishing 370 ports in use, with the count rising to about 900 AFTER the error. We aleady patched the registry (it is a windows machine) to allow more than the 5000 client ports standard, but even then, we are far far from that limit to start with. Which is why I am asking here. Ayneone an ide what ELSE could cause this? It is a Windows 2003 Server machine, 64 bit. The only other thing I can see that may cause it (but this functionality is supposedly disabled) is Symantec Endpoint Protection that is installed on the server - and being capable of actinc as a firewall, it could possibly intercept network traffic. I dont want to open a can of worms by pointing to Symantec prematurely (if pointing to Symantec can ever be seen as such). So, anyone an idea what else may be the cause? Thanks

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• Change font size for "Default Paragraph Font" in Word

  - by Richard Gadsden

  I have a document where the built-in style "Default Paragraph Font" has been set to a particular size. It shouldn't have a size - it should be inheriting from the paragraph style (that's the whole point of the style). If I go through the user interface, I can't modify this style (the modify button / dropdown is greyed out) While I can work around this in most places, it creates problems for the Table of Contents in particular, as that is forced to be in this style and it overrides the font size from the styles like TOC 1 (etc). I can set the font size through VBA - ActiveDocument.Styles("Default Paragraph Font").Font.size = 10 sets it to ten point, but I can't work out how to reset it back to inherit. At the moment, my table of contents is set to be all in the same size, but really TOC 1 should be bigger than TOC 2. Does anyone have any suggestions for how to fix this? One approach is to use the organizer to copy over the style from a working document, but ideally I'd like a way to resolve the problem without doing that - especially as that's not an easy approach to automate.

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• tap interfaces always disabled in linux bridge

  - by Dani Camps

  I have a physical interface eth0, and I want to create two virtual interfaces and bridge them with eth0. For this purpose I do: #Create the virtual interfaces tunctl -t tap0 tunctl -t tap1 ifconfig tap0 up ifconfig tap1 up #Create the bridge brctl addbr br0 brctl stp br0 off brctl addif br0 eth0 brctl addif br0 tap0 brctl addif br0 tap1 #Turning up the bridge ifconfig br0 up However my problem if that the tap interfaces always appear disabled in the bridge, and no traffic flows to them. $brctl show br0 bridge name bridge id STP enabled interfaces br0 8000.080027cabeba no eth2 tap0 tap1 $brctl showstp br0 br0 bridge id 8000.080027cabeba designated root 8000.080027cabeba root port 0 path cost 0 max age 20.00 bridge max age 20.00 hello time 2.00 bridge hello time 2.00 forward delay 15.00 bridge forward delay 15.00 ageing time 300.01 hello timer 0.00 tcn timer 0.00 topology change timer 0.00 gc timer 298.42 flags eth2 (1) port id 8001 state forwarding designated root 8000.080027cabeba path cost 4 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8001 forward delay timer 12.97 designated cost 0 hold timer 1.24 flags tap0 (2) port id 8002 state disabled designated root 8000.080027cabeba path cost 100 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8002 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags tap1 (3) port id 8003 state disabled designated root 8000.080027cabeba path cost 100 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8003 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags Is there any way to set the tap interfaces in forwarding state? I do not understand why they are not because STP is disabled. Cheers Daniel

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• Netgear GS724Tv3 and link aggregation Mac OS X Server 10.6.8

  - by Manca Weeks

  I need to link aggregate 2 sets of ports on the Netgear GS724T with my Apple server tower (latest generation). I have 2 built in ports and 2 ports on a PCIe ethernet card. It is not obvious to me how to properly configure the Netgear end. I have access to the Netgear box through its web interface, just don't know how to properly set the settings. I tried going to Netgear for help, but they said my software support has expired. I bought this unit on their recommendation - they say it is compatible with 802.3ad protocol. I cannot locate any references to this protocol in the manual and I noticed some people in formus say that this device is actually not compatible with 802.3ad and that Netgear is misleading potential customers by saying it is. Any help will be appreciated. Thanks, M My own answer - posted as edit because of restrictions on my user: OK folks, turns out one must use a Windows machine on this one or nothing makes sense. I was unable to get much farther than viewing the default inactive LAGs because in Firefox and Safari on Mac things don't make much sense - i.e. the Apply buttons (supposedly JavaScript) don't work. You can view the configurations, but none of the modifications you make stick. Then, in Switching - LAGs, choose the ports to include and make sure you switch the LAG type from Static to LACP and all is well. Haven't tested the performance of the config yet, but both sides appear to be happy with the configuration. Apple server says link active and so does the Netgear. Will report if any other discoveries. Thanks for all who read and to user84104 for responding. M

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• Network problems with Ubuntu on VMware

  - by svick

  I'm running Ubuntu 10.04 inside VMware Player running under Windows Vista and I can't connect to the internet or the host computer from the Ubuntu. I have set all the VMware services to “manual” (like VMware DHCP Service), but starting them manually doesn't help. In VMware, the network seems to work (there is a green dot beside the network icon) and I have tried both Bridged and NAT settings. ifconfig doesn't show the eth1 interface, unless I give it as a parameter (or use -a). I think this means that Ubuntu thinks that the network isn't connected at all. How do I fix this? ifconvadmin@ubu1004:~$ ifconfig lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:56 errors:0 dropped:0 overruns:0 frame:0 TX packets:56 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:4192 (4.1 KB) TX bytes:4192 (4.1 KB) vadmin@ubu1004:~$ ifconfig eth1 eth1 Link encap:Ethernet HWaddr 00:0c:29:2d:a0:6f BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:18 Base address:0x2000

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• Migrating to CF9: trouble getting JRun working with SSL

  - by DaveBurns

  I have a client on MX7 who wants to migrate to CF9. I have a dev environment for them on my WinXP machine where I've configured MX7 to run with JRun's built-in web server. I've had that working for a long time with both regular and SSL connections. I installed CF9 yesterday side-by-side with the existing MX7 install to start testing. The install was smooth and detected MX7, adjusted CF9's port numbers for no conflict, etc. Testing started well: MX7 over regular and SSL still worked and CF9 worked over regular HTTP. But I can't get CF9 to work with SSL. I installed a new certificate with keytool, FireFox (v3.6) complained about it being unsigned, I added it to the exception list, and now I get this: Secure Connection Failed An error occurred during a connection to localhost:9101. Peer reports it experienced an internal error. (Error code: ssl_error_internal_error_alert) I've been Googling that in all variations but can't find much help to get past this. I don't see any info in any log files either. FWIW, here's my SSL config from SERVER-INF/jrun.xml: <service class="jrun.servlet.http.SSLService" name="SSLService"> <attribute name="enabled">true</attribute>` <attribute name="interface">*</attribute> <attribute name="port">9101</attribute> <attribute name="keyStore">{jrun.rootdir}/lib/mykey</attribute> <attribute name="keyStorePassword">*deleted*</attribute> <attribute name="trustStore">{jrun.rootdir}/lib/trustStore</attribute> <attribute name="socketFactoryName">jrun.servlet.http.JRunSSLServerSocketFactory</attribute> <attribute name="deactivated">false</attribute> <attribute name="bindAddress">*</attribute> <attribute name="clientAuth">false</attribute> </service> Anyone here know of any issues re setting up SSL and CF9? Anyone had success with it? Dave

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• IPSec Tunnel to Amazon EC2 - Netkey, NAT, and routing problem

  - by Ernest Mueller

  Hey all, I'm working on getting an IPSec VPN working between Amazon EC2 and my on-premise. The goal is to be able to safely administer stuff, up/download data, etc. over that tunnel. I have gotten the tunnel up in openswan between a Fedora 12 instance with an elastic IP and a Cisco router that's also NATted. I think the ipsec part is OK, but I'm having trouble figuring out how to route traffic that way; there's no "ipsec0" virutal interface because on Amazon you have to use netkey and not KLIPS for the vpn. I hear iptables may be required and I'm an iptables noob. On the left (Amazon), I have a 10. network. Box 1 is privately 10.254.110.A, publically IP 184.73.168.B. Netkey tunnel is up. Box 2 is publically 130.164.26.C, privately 130.164.0.D And my .conf is: conn ni type= tunnel authby= secret left= 10.254.110.A leftid= 184.73.168.B leftnexthop= %defaultroute leftsubnet= 10.254.0.0/32 right= 130.164.26.C rightid= 130.164.0.D rightnexthop= %defaultroute rightsubnet= 130.164.0.0/18 keyexchange= ike pfs= no auto= start keyingtries= 3 disablearrivalcheck=no ikelifetime= 240m auth= esp compress= no keylife= 60m forceencaps= yes esp= 3des-md5 I added a route to box 1 (130.164.0.0/18 via 10.254.110.A dev eth0) but that doesn't do it for predictable reasons, when I traceroute the traffic's still going "around" and not through the vpn. Routing table: 10.254.110.0/23 dev eth0 proto kernel scope link src 10.254.110.A 130.164.0.0/18 via 10.254.110.178 dev eth0 src 10.254.110.A 169.254.0.0/16 dev eth0 scope link metric 1002 Anyone know how to do the routing with a netkey ipsec tunnel where both sides are NATted? Thanks...

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• Debian DNSSEC - howto secure a domain?

  - by Daniel Marschall

  I have a beginner question about DNSSEC. I have much experience with TLS and cryptography-stuff and would like to try out this new technology. I have googled very much about this but I haven't found useful information for me. I think one confusion in information gathering is that "Debian howto DNSSEC setup" can mean "How to USE DNSSEC for resolving" OR "How to secure your domain with DNSSEC". I am searching the second. I am running a Debian Squeeze server with root privileges which has a domain name ending with ".de" (which is already signed by the root zone). The network interface at this server uses the gateway IP (DNS resolver?) of the datacentre the server is running on. My domain is hosted at freedns.afraid.org , where I can add DNS RRs for my domain. They are currently NOT capable of adding DNSSEC RRs, but I am bugging them to support this soon. ;-) My simple question is: How do I setup DNSSEC on Debian? Resp. who have I ask to? As far as I understand, all I have to do is to run dnssec-keygen on my Debian server and then add the key to my DNS-provider as DNSSEC RR. (And change it every 30 days?) I have looked at this http://www.isc.org/files/DNSSEC_in_6_minutes.pdf but it looks like you have to be the owner of a ZONE, so I don't think this applies to me. Who needs to sign my domain? My DNS-provider or my zone (DeNIC) or can I do it myself? Any help is very appreciated!

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• Error while installing boost_1_54

  - by Farhat

  On trying to install boost I get this error during configuration checks. Googling did not give any pointers. [root@heracles boost_1_54_0]# ./b2 install Performing configuration checks - 32-bit : no (cached) - 64-bit : yes (cached) - arm : no (cached) - mips1 : no (cached) - power : no (cached) - sparc : no (cached) - x86 : yes (cached) error: No best alternative for libs/coroutine/build/allocator_sources next alternative: required properties: <link>static <target-os>windows <threading>multi not matched next alternative: required properties: <link>static <segmented-stacks>on <threading>multi not matched next alternative: required properties: <link>static <threading>multi not matched - has_icu builds : no (cached) warning: Graph library does not contain MPI-based parallel components. note: to enable them, add "using mpi ;" to your user-config.jam - zlib : yes (cached) - iconv (libc) : yes (cached) - icu : no (cached) - icu (lib64) : no (cached) - compiler-supports-ssse3 : yes (cached) - compiler-supports-avx2 : no (cached) - gcc visibility : yes (cached) - long double support : yes (cached) warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. error: No best alternative for libs/coroutine/build/allocator_sources next alternative: required properties: <link>static <target-os>windows <threading>multi not matched next alternative: required properties: <link>static <segmented-stacks>on <threading>multi not matched next alternative: required properties: <link>static <threading>multi not matched - zlib : yes (cached) How can the alternative for allocator sources be located? Thanks.

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• How to subnet hosted VMs

  - by bwizzy

  I have a network of VMs each having a LAN IP address and a public IP address. They each have a 1:1 NAT map for public access via the public IP for HTTP, SSH etc. I'm trying to figure out a way to restrict the LAN IPs from talking to each other, but there are some cases where a group of LAN IPs will need to communicate. I'm using pfSense as a firewall / router on a 192.168.0.0/24 configuration. It seems like I could assign each VM it's own subnet and add a static route to the firewall for that VM to get back to the firewall for internet access / other fw rules. Is that right? I assigned 1 VM with: address 192.168.1.2 netmask 255.255.255.254 gateway 192.168.1.1 Then added a static route on the FW's LAN interface using 192.168.1.0/30 as the destination network and 192.168.1.1 as the gateway. Nothing appears to be working, anyone have any ideas? Please be aware I'm not that familiar with subnets. Thanks!

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• Change OpenVZ route to pass through ip failover

  - by Kevin Campion

  I have one dedicaced server with its own IP and another IP (failover) who refer to the first. I will wish to change the gateway of a Proxmox virtual machine (openvz) who runs on this dedicaced server to go through the failover IP rather than the ip of host main server. Once connected to a virtual machine, when I do a traceroute VE# traceroute www.google.fr traceroute to www.google.fr (209.85.229.104), 30 hops max, 60 byte packets 1 MY_SERVER_NAME.ovh.net (xxx.xxx.xxx.xxx FIRST_IP_MAIN_SERVER) 0.021 ms 0.010 ms 0.009 ms The first line tells me the ip of host main server. I would like that the traceroute display the second IP failover. VE# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.0.2.1 * 255.255.255.255 UH 0 0 0 venet0 default 192.0.2.1 0.0.0.0 UG 0 0 0 venet0 With iptables HOST# iptables -t nat -L Chain POSTROUTING (policy ACCEPT) target prot opt source destination MASQUERADE all -- anywhere anywhere MASQUERADE all -- anywhere anywhere SNAT tcp -- anywhere 10.10.101.2 tcp dpt:www state NEW,RELATED,ESTABLISHED,UNTRACKED to:SECOND_IP_FAILOVER SNAT all -- 10.10.101.2 anywhere to:SECOND_IP_FAILOVER 10.10.101.2 is the virtual machine IP (interface venet0) Any ideas ?

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• Forwarding HTTP Request with Direct Server Return

  - by Daniel Crabtree

  I have servers spread across several data centers, each storing different files. I want users to be able to access the files on all servers through a single domain and have the individual servers return the files directly to the users. The following shows a simple example: 1) The user's browser requests http://www.example.com/files/file1.zip 2) Request goes to server A, based on the DNS A record for example.com. 3) Server A analyzes the request and works out that /files/file1.zip is stored on server B. 4) Server A forwards the request to server B. 5) Server B returns file1.zip directly to the user without going through server A. Note: steps 4 and 5 must be transparent to the user and cannot involve sending a redirect to the user as that would violate the requirement of a single domain. From my research, what I want to achieve is called "Direct Server Return" and it is a common setup for load balancing. It is also sometimes called a half reverse proxy. For step 4, it sounds like I need to do MAC Address Translation and then pass the request back onto the network and for servers outside the network of server A tunneling will be required. For step 5, I simply need to configure server B, as per the real servers in a load balancing setup. Namely, server B should have server A's IP address on the loopback interface and it should not answer any ARP requests for that IP address. My problem is how to actually achieve step 4? I have found plenty of hardware and software that can do this for simple load balancing at layer 4, but these solutions fall short and cannot handle the kind of custom routing I require. It seems like I will need to roll my own solution. Ideally, I would like to do the routing / forwarding at the web server level, i.e. in PHP or C# / ASP.net. However, I am open to doing it at a lower level such as Apache or IIS, or at an even lower level, i.e. a custom proxy service in front of everything. Thanks.

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• SLI Video Cards

  - by Scott

  I'm configuring a new desktop. I'm looking through all PCI Express 2.0 x16 video cards on NewEgg at the moment. All cards seem to be stating that they have SLI Support or CrossFireX support. I know that these 2 technologies enable you to connect more than one video card together to create more of a powerful video experience. These cards that have this support seem to be more expensive that other cards though. When I did a NewEgg search for cards that did NOT have these two supports, no matches came up for PCI Express 2.0 x16 (haven't checked other interfaces yet though). Can you run an SLI/CrossFireX card as a single card (and if you can is it efficient or even good?), or do you need to have more than one card to run them? Also, do they make cards without these two technologies anymore, and are they even cheaper at this point? I really have no need for SLI/CrossFireX at all, so I was wondering what I should look into. Do cards without this technology not run on the PCI Express 2.0 x16 interface? Thanks ahead of time for all your help.

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• SLI Video Cards

  - by Scott

  I'm configuring a new desktop. I'm looking through all PCI Express 2.0 x16 video cards on NewEgg at the moment. All cards seem to be stating that they have SLI Support or CrossFireX support. I know that these 2 technologies enable you to connect more than one video card together to create more of a powerful video experience. These cards that have this support seem to be more expensive that other cards though. When I did a NewEgg search for cards that did NOT have these two supports, no matches came up for PCI Express 2.0 x16 (haven't checked other interfaces yet though). Can you run an SLI/CrossFireX card as a single card (and if you can is it efficient or even good?), or do you need to have more than one card to run them? Also, do they make cards without these two technologies anymore, and are they even cheaper at this point? I really have no need for SLI/CrossFireX at all, so I was wondering what I should look into. Do cards without this technology not run on the PCI Express 2.0 x16 interface? Thanks ahead of time for all your help.

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• Cisco ASA dropping IPsec VPN between istself and CentOS server

  - by sebelk

  Currently we're trying to set up an IPsec VPN between a Cisco ASA Version 8.0(4) and a CentOS Linux server. The tunnel comes up successfully, but for some reason that we can't figure out, the firewall is dropping packets from the VPN. The IPsec settings in the ASA sre as follows: crypto ipsec transform-set up-transform-set esp-3des esp-md5-hmac crypto ipsec transform-set up-transform-set2 esp-3des esp-sha-hmac crypto ipsec transform-set up-transform-set3 esp-aes esp-md5-hmac crypto ipsec transform-set up-transform-set4 esp-aes esp-sha-hmac crypto ipsec security-association lifetime seconds 28800 crypto ipsec security-association lifetime kilobytes 4608000 crypto map linuxserver 10 match address filtro-encrypt-linuxserver crypto map linuxserver 10 set peer linuxserver crypto map linuxserver 10 set transform-set up-transform-set2 up-transform-set3 up-transform-set4 crypto map linuxserver 10 set security-association lifetime seconds 28800 crypto map linuxserver 10 set security-association lifetime kilobytes 4608000 crypto map linuxserver interface outside crypto isakmp enable outside crypto isakmp policy 1 authentication pre-share encryption aes hash sha group 2 lifetime 28800 crypto isakmp policy 2 authentication pre-share encryption aes-256 hash sha group 2 lifetime 86400 crypto isakmp policy 3 authentication pre-share encryption aes-256 hash md5 group 2 lifetime 86400 crypto isakmp policy 4 authentication pre-share encryption aes-192 hash sha group 2 lifetime 86400 crypto isakmp policy 5 authentication pre-share encryption aes-192 hash md5 group 2 group-policy linuxserverip internal group-policy linuxserverip attributes vpn-filter value filtro-linuxserverip tunnel-group linuxserverip type ipsec-l2l tunnel-group linuxserverip general-attributes default-group-policy linuxserverip tunnel-group linuxserverip ipsec-attributes pre-shared-key * Does anyone know where the problem is and how to fix it?

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• Cannot browse remote networks even with WINS configured

  - by paradroid

  As the NetBIOS protocol acts on Layer 2 and so is not routable, In order to enable network browsing of remote networks, WINS has been installed and configured on two domain controllers, both of which are on different networks. The WINS servers seem to be replicating with eachother, and each has 127.0.0.1 set as the Primary WINS Server in each of their LAN interface properties, with nothing entered for Secondary WINS Server. The DC which holds the PDC Emulator FSMO role has the Computer Browser service running and set to Auto start, and it has the WINS/NBT node type network setting at 0x8 (H-node - Hybrid node). Remote network browsing does not work. Is the WINS/NBT node type correct for this scenario? The reason why I think it may not be the right one is because I set the DHCP Server's 046 WINS/NBT node type option to 0x8 as well, after which the DHCP clients started to disappear from the Network folders. When that option is not set, does it default to B-node (Broadcast node)? Or could it be a problem with the WINS servers setup?

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• Valid IP address but can't surf without rebooting

  - by Kat

  I periodically lose internet and router connection at home. When this happens, others are using the router just fine. I am connecting directly through a wired connection to a Belkin router. I can release and renew the IP (and the IP addresses change to 0.0.0.0 and to an IP in my router's range beginning with 192.168.2. as they should) but still can't surf, can't access the router interface. Cycling the router doesn't help, and again, others are able to access the router fine at this time. Only rebooting the computer resolves the issue, and everything is wonderful for a few hours- and then I lose connection again. I have several ideas where to go from here, but I'd like to get some advice first. (Using Windows XP SP3, hardwired connection) Update As stated in the originally, releasing and renewing doesn't solve the issue. However, I have an update. I can ping localhost and my router IP with no problem at all when the issue occurs. However, repairing the network connection does not help. I AM able to get back on by disabling and then re-enabling the network connection in XP. What does that tell us?

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• Ubuntu second static IP, ifconfig, /etc/network/interfaces

  - by Schmoove

  I would like to add a second static IP to my local Ubuntu 11.10 desktop machine and have it automatically available after rebooting. So far I am successfully using ifconfig to to temporarily set up an alias for my primary network interface: # ifconfig eth1:0 192.168.178.3 up # ifconfig eth1 Link encap:Ethernet HWaddr c8:60:00:ef:a3:d9 inet addr:192.168.178.2 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::ca60:ff:feef:a3d9/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:61929 errors:0 dropped:0 overruns:0 frame:0 TX packets:64034 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:45330863 (45.3 MB) TX bytes:28175192 (28.1 MB) Interrupt:42 Base address:0x4000 eth1:0 Link encap:Ethernet HWaddr c8:60:00:ef:a3:d9 inet addr:192.168.178.3 Bcast:192.168.178.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:42 Base address:0x4000 However, when I add the following to /etc/network/interfaces, the alias is not up and running as expected after a reboot: # vi /etc/network/interfaces auto eth1:0 iface eth1:0 inet static address 192.168.178.3 netmask 255.255.255.0 I would like to know what to configure to get this to work. As a side note, I am running gnome shell.

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