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  • iptables -L lags on non localhost or anywhere address

    - by DazSlayer
    I am trying to configure iptables for ubuntu 10.04 and I have a problem with iptables -L lagging on rows where the destination or source address is not localhost or anywhere. The following entries will cause lag on their row: iptables -A INPUT -p tcp --dport 111 -s 192.168.1.14 -j ACCEPT iptables -A INPUT -p tcp --dport 90 -d 192.168.1.14 -j ACCEPT while this does not: iptables -A INPUT -p tcp --dport localhost -s 192.168.1.14 -j ACCEPT iptables -A INPUT -p tcp --dport localhost -d 192.168.1.14 -j ACCEPT I feel like this might be due to iptables checking to see if the ip is reachable. If not, what is the cause, if it is how can I disable it?

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  • Most suitable high availability solution

    - by Alex Bagnolini
    My company is hosting a website in a server with IIS, SQL Server and a 3rd party windows service (written in C#, source code available for amendments). We bought a new identical server, composed by: 1x Quad Core, 12GB RAM, 4x160GB SATA Raid 5, Windows Server 2008 R2 Datacenter, Public IP. We aim to put all webpages and the 3rd party windows service in an high-availability state. After some lab-testing on how to configure Failover Clustering and Hyper-V, we have deep doubts on what the "best" solution would be, by "best" meaning maintainable and able to correctly handle a physical server failure. Any suggestion on how we should configure the two servers? We don't need all the configuration's step, just an hint on the right direction to follow.

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  • MySQL port 3306 became filtered when configured with Keepalived on Ubuntu server 12.04 lts

    - by Ludwig
    I'm configuring two load balancer (lb01 & lb02) with keepalived for my two mysql server (db01 & db02) with standard port 3306. There is virtual ip address (192.168.205.10) to access it also act as failover, but somehow the web server in the front can't access this mysql server using vip. Here is my config: Keepalived: Only the mysql part that i added here. LB01: virtual_server 192.168.205.10 3306 { delay_loop 6 lb_algo rr lb_kind DR protocol TCP real_server 192.168.205.4 3306 { weight 10 TCP_CHECK { connect_port 3306 connect_timeout 2 } } } LB02: virtual_server 192.168.205.10 3306 { delay_loop 6 lb_algo rr lb_kind DR protocol TCP real_server 192.168.205.6 3306 { weight 10 TCP_CHECK { connect_port 3306 connect_timeout 2 } } } I already comment out the "bind-address=127.0.0.1" part in both server my.cnf. Also, remove all the firewall prog from my ubuntu server (ufw or iptables). Any help? thanks.

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  • Correct way of bringing network interface down in linux

    - by Karolis T.
    For example: $ ifconfig dummy0 up $ ifconfig dummy0 "192.168.1.190 netmask 255.255.255.0" Calling ifconfig with no parameters shows the interface dummy0 Link encap:Ethernet HWaddr b6:1f:f3:92:6d:20 inet addr:192.168.1.190 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::b41f:f3ff:fe92:6d20/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:15 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:1050 (1.0 KiB) How can I bring the interface down so that it doesn't show up in ifconfig ifconfig -a ifconfig dummy0 without rmmod dummy because dummy is used just for example purposes. If there is no way to do that, what "throw-away" IP could I set to it and be safe from any trouble? like $ ifconfig dummy0 down $ ifconfig dummy0 0.0.0.0

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  • traffic shaping for certain (local) users

    - by JMW
    Hello, i'm using ubuntu 10.10 i've a local backup user called "backup". :) i would like to give this user just a bandwidth of 1Mbit. No matter which software wants to connect to the network. this solution doesn't work: iptables -t mangle -A OUTPUT -p tcp -m owner --uid-owner 1001 -j MARK --set-mark 12 iptables -t mangle -A POSTROUTING -p tcp -m owner --uid-owner 1001 -j MARK --set-mark 12 tc qdisc del dev eth0 root tc qdisc add dev eth0 root handle 2 htb default 1 tc filter add dev eth0 parent 2: protocol ip pref 2 handle 50 fw classid 2:6 tc class add dev eth0 parent 2: classid 2:6 htb rate 10Kbit ceil 1Mbit tc qdisc show dev eth0 tc class show dev eth0 tc filter show dev eth0 does anyone know how to do it? thanks a lot in advance

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  • How to document linux server configuration?

    - by Margaret Thorpe
    Hi, I have about 20 linux servers which I need to document the configuration of. I do not mean the detailed configuration of services, but rather user accounts, databases, databases accounts, ip addresses, physical location, SSH port etc. etc. I know all this data is stored in config files, but I want to centralize it all. I am considering just creating a spreadsheet to record this data, but was wondering if there is something better (perhaps a small php/mysql app) which would be more structured and complete than a hacked together spreadsheet. What do you use?

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  • Difference between tcp recv buffer and tcp receive window size?

    - by pradeepchhetri
    The command shows the tcp receive buffer size in bytes. $ cat /proc/sys/net/ipv4/tcp_rmem 4096 87380 4001344 where the three values signifies the min, default and max values respectively. Then I tried to find the tcp window size using tcpdump command. $ sudo tcpdump -n -i eth0 'tcp[tcpflags] & (tcp-syn|tcp-ack) == tcp-syn and port 80 and host google.com' tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 16:15:41.465037 IP 172.16.31.141.51614 > 74.125.236.73.80: Flags [S], seq 3661804272, win 14600, options [mss 1460,sackOK,TS val 4452053 ecr 0,nop,wscale 6], length 0 I got the window size to be 14600 which is 10 times the size of MSS. Can anyone please tell me the relationship between the two.

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  • How to use ssl_verify_client=ON on one virtual server and ssl_verify_client=OFF on another?

    - by Alexander Artemenko
    I want to force ssl client verification for on of my virtual hosts. But get "No required SSL certificate was sent" error, trying to GET something from it. Here are my test configs: # defaults ssl_certificate /etc/certs/server.cer; ssl_certificate_key /etc/certs/privkey-server.pem; ssl_client_certificate /etc/certs/allcas.pem; server { listen 1443 ssl; server_name server1.example.com; root /tmp/root/server1; ssl_verify_client off; } server { listen 1443 ssl; server_name server2.example.com; root /tmp/root/server2; ssl_verify_client on; } First server replies with 200 http code, but second returns "400 Bad Request, No required SSL certificate was sent, nginx/1.0.4". Probably, it is implossible to use ssl_verify_client on the same IP? Should I bind these servers to different IPs, will it solve my problem?

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  • Trusted Root certificates regularly disappear on Windows 7

    - by Evgeny
    I've installed several self-signed certificates on my Windows 7 Ultimate x64 machine for development purposes. One was installed into Trusted Root CAs and 2 were installed into My Certificates and Trusted People. Every day or two the certificate installed into Trusted Root CAs disappears and I have to re-install it! This is annoying the hell out of me. Why is it happening and how do I stop it? The other certificates (installed into other stores) do not disappear. My first thought was some kind of Group Policy, but my machine is not part of a domain - though it does obtains its IP address from a corporate DHCP server, so I'm not sure if they can somehow still manage to apply Group Policy to me.

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  • How Do I Change the Windows7 LAN Proxy Config from the Command Line

    - by david.barkhuizen
    In Windows7, Is it possible to define/change the proxy config from the command line ? So, using the gui, I would go: Start Control Panel Network and Internet Internet Options Connections LAN Settings and then - enable/disable the proxy - define IP:port of proxy server But I would like to rather do this from the command line (so that I can run the command from a batch-file with a shortcut key - enabling me to switch proxy configs using a short-cut, rather than having to wade through the MS wizard). I've looked at using netsh.exe to change the settings for WinHTTP, but this seems to be thr wrong thing to do, as the WinHTTP setting do not appear to be related to the LAN settings. Much appreciated folks.

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  • CheckPoint VPN-1 SecureClient inability to navigate behind a Linksys WAG300N

    - by user46819
    I have a Linksys WAG300N, I'm accessing my LAN with Wifi and everything works fine on my Windows 7 Enterprise laptop. When I try to connect to my company's VPN the connection succeeds, but I cannot access any internet site either within my work network or public site like Yahoo or Google. In my Linksys control panel I already verified all types of VPNs are enable to passthrough. Normal IPSec and Windows VPN worked in the past without any problems. CheckPoint seems to have a solution, but I do not have the ability to change the IP in my client and of course using another NAT device in between is not a solution for me. Edit: adding link to the Checkpoint solution, https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk26189

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

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

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  • pfsense CARP - wan failure on firewall

    - by eldblz
    I have recently configured 2 firewall (on 2 DELL PowerEdge R210II with ESXI 5.1) with pfsense. We have several LANs and 2 WANs. Everything is running fine but i have a strange behavior: i can access internet from alla LANs but not from the firewall (itself). For example the firewall cannot retrive package information or if i setup a gatway monitor ip (like google 8.8.8.8 ) this fails. These are the screenshots of firewall configuration: http://imgur.com/a/LNuMz#0 ATM i kept firewall rules to minimum to avoid problem or conflicts. Any ideas how to solve the problem? Thank you in advance.

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  • Nginx. How do I reject request to unlisted ssl virtual server?

    - by Osw
    I have a wildcard SSL certificate and several subdomains on the same ip. Now I want my nginx to handle only mentioned server names and drop connection for others so that it'd look like nginx is not running for unlisted server names (not responding, rejecting, dead, not a single byte in response). I do the following ssl_certificate tls/domain.crt; ssl_certificate_key tls/domain.key; server { listen 1.2.3.4:443 ssl; server_name validname.domain.com; // } server { listen 1.2.3.4:443 ssl; server_name _; // deny all; // return 444; // return 404; //location { // deny all; //} } I've tried almost everything in the last server block, but no success. I get either valid response from known virtual server or error code. Please help.

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  • Nginx Forward SSL for single site

    - by Will.brown
    I have a nginx server setup and it works fine for http however i would like to bypass the proxy for https connection. I want it so that when someone goes to my ip https:// ip1 (Nginx server) it bypasses ngix and forwards all traffic to https:// ip2(webserver) i do not need ngix to do this for any ssl website just one particular website. SO Client to https:// ip1 to https:/ /ip2 to https:// ip1 to client pc I just want the nginx to not intercept the connection and forward it on and on return forward the connection to client Im guessing i do this by nat mascarade buy not exactly sure how to do it and if i will need to tell nginx to ignore ssl aswell can someone help me please this has gone me stuck

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  • How can I solve Windows PPTP VPN issues?

    - by Robin M
    I'm having persistent problems with Windows PPTP VPN connections. The VPN appears up whilst the tunnel won't transfer traffic (ping to a remote IP within the VPN works for a while, and then fails). The client receives routing information via DHCP. When the connection fails, the routing table is still correct so I don't think it's a routing problem. My internet connection is via an ADSL2 line. There's software to deal with PPTP problems, like TunnelRat, but I don't want to install v1.1 of the .NET framework and I'd rather get to the bottom of the problem (I have multiple VPN connections and some are more unreliable than others). What can I do to get to the bottom of this? Alternatively, what can I do to keep the connection alive?

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  • Encrypt LAN and wifi traffic on small private network

    - by Grimlockz
    I need some advice about encrypt all traffic on a small private network running wi-fi and LAN traffic on 192.168.0.x network. The network would comprise of client laptops connecting to the wi-fi router (192.168.0.254) via ethernet connection or wireless. The main purpose of the server is for the client laptops to talk to two servers on different IP's (192.168.0.200 and 192.168.0.201) on ports 80 and 433. My main concern is having packet sniffers and what not getting access to the data. The only ways I see at the moment is to have VPN running on the network or use IPSec policy's to do this. Any other ways guys?

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  • MySQL on Windows - how do I set the wait_timeout for connections using named pipes?

    - by gustafc
    I use a MySQL database running on a Windows box, and for performance reasons I'm connecting to it using named pipes. The (Java) application using the database (through Hibernate) can let the connection lie idle for quite a long time, which causes the connection to fail with the following message: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 33 558 297 milliseconds ago. The last packet sent successfully to the server was 33 558 297 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. autoReconnect unfortunately has no effect (and neither does autoReconnectForPools), but the wait_timeout docs state that wait_timeout only applies "to TCP/IP and Unix socket file connections, not to connections made via named pipes, or shared memory". How can I change the wait_timeout for named pipes?

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  • How do I change the document root of a Linux Apache server?

    - by Daryl Spitzer
    I'm trying to learn how to configure an Apache HTTP server (with which I have no experience) someone else has setup in a VM running Ubuntu 8.04. I know the server is running, since I get "<html><body><h1>It works!</h1></body></html>" when I go to http://1.2.3.4/ (where 1.2.3.4 is the VM's IP number). I found apache2.conf and httpd.conf (among other files) in /etc/apache2/. httpd.conf is empty. I tried adding DocumentRoot "/home/username/temp" into /etc/apache2/httpd.conf and put some simple HTML in /home/username/temp/index.html. But when I reload http://1.2.3.4/ there's no change. Do I need to restart httpd to get it to accept the change to DocumentRoot?

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  • Locally redirect Domain1.com to Domain2.com/subdir on one computer

    - by Werner
    I am running a FreeBSD server and I want to redirect a specific website domain to another domain including subdirectory. I want to bypass that domain to alter the XML results it returns. I tried the hosts file solution, but that way I can only redirect to an IP address without subdir. So that's no solution. Is there another way to solve this? Installing something on the server if needed is not a problem. Unless it's a heavy program.

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  • Windows refuses to believe printer is online unless I delete and re-add it

    - by Marcin
    I have a Canon MP560. It is online, in the sense that (a) I can connect to its internal web server; and (b) if I delete the printer in windows (windows 7), and reinstall it, windows will recognise that the printer is online, and talk to it. In all other cases, the windows and mac computers (purchased last week, running whatever is the latest and greatest mac os) in my household will simply not recognise that the printer is online. The printer is statically configured to use the same IP address, so that's not an issue. Because the printer works just fine with windows after delete and re-add, I assume that the issue with the mac is that I haven't installed whatever drivers Macs need to talk to Canon printers over a network.

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  • How to configure my hosting provider for email when DNS redirection already in place?

    - by Johann
    First of all I apologize for my poor understanding of network and I hope I used the correct terminology for everything: I have bought a domain name with 1&1 to create an online shop, using kingeshop. I followed the steps explains here to point the domain name to kingeshop IP address and everything is working fine. Now I would also like to use my domain name to create an email account. But 1&1 seems to say they're not responsible for this now the DNS is transfered to kingeshop's. What I'm wondering is who is really "in charge" of my domain name now? 1&1 also lets me configure the MX-record but I don't have a clue what I can do with this. Could I just use an existing gmail address somehow? Thanks a lot for any help or clarity you can bring me on that matter!

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  • thought on real time web analytics

    - by Linus
    we have a few web servers and am planning to create a dashboard to show the real time stats ip address,geo-location and other custom data based on database lookups. Splunk sort of fits perfectly but wondering if there are any open source alternative . i have looked at logstash and graylog2, but to my knowledge they are more of a log analysis tools. Piwik is sort of interesting except that i cannot put any javascript on the webpages. All i have access to is apache web log. Any recommendations please..

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  • SMTP server problem

    - by ram
    Hi, Our requirement is to send weekly newsletters to our website customers. For which we wanted to have local hosted SMTP server in our office. We are not using SMTP server provided by website hosting provider, as we wanted to reduce the network traffic and avoid IP blocking due to bulk mails. We are sending newsletters on weekly basis from our local SMTP server. But due to some reasons, some emails are going to spam and some are not reaching to customers and sometimes there are bounce messages to follow bulk email guidelines (mainly from Gmail). Can you please suggest me, how to achieve my problem. I also wanted to know what type of technology generally Linkedin or banks uses to send notifications emails to all its customers. When they send bulk emails, they will always reach inbox with out any problem. I want the same solution to implement for my website. Please suggest me. Thank you very much in advance.

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  • How to set up Windows server 2008 to receive email?

    - by Saul
    First off apologies, I'm from a medical background not a networking one, but I've got roped into setting up a windows 2008 server. So far web server running, fixed IP address assigned (within a large private network of the National Health Service in the UK if that makes any difference) and the network team have assigned a DNS entry for me which works, so the server can be addressed as nww.myserver.nhs.uk I've only got ports open on the router for 80 and 443 (http and https) at the moment, so presume I need a different port to enable email services. My need is to be able to accept an email to the domain name like [email protected] in order to pick up a confirmation mail from an SSL issuer (Comodo) I guess to confirm that I control the domain. After that I don't actually need mail services on the server. I see lots of stuff about setting up SMTP services but thought that was about mail out and re-routing, but how do you get the server to "listen" for mail to the domain (assuming I open port xyz or whatever it is) ?

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