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• switch's mgmt-ip is not remotely reachable.

  - by RainDoctor

  Switch model: Netgear FSM7352PS mgmt-ip: 192.168.1.100/24 Vlan id: 1 (default) There are couple of hosts in this Vlan: 192.168.1.2 (esxi console), for instance. 192.168.1.1 is the firewall/router interface. I can ping 192.168.1.1 and 192.168.1.2 from other vlans, say, 172.31.0.0/24 I can ssh to 192.168.1.2 from 172.31.0.0/24 I can't ping 192.168.1.100 from 172.31.0.0/24 However, I can ping 192.168.1.100 from 192.168.1.2 or from my laptop connected to that vlan (192.168.1.11). I can connect to the web GUI from my laptop when I am in that Vlan. Can anyone shed some light on why I am not able to connect from other vlans?

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• How to distinguish between two different UDP clients on the same IP address?

  - by Ricket

  I'm writing a UDP server, which is a first for me; I've only done a bit of TCP communications. And I'm having trouble figuring out exactly how to distinguish which user is which, since UDP deals only with packets rather than connections and I therefore cannot tell exactly who I'm communicating with. Here is pseudocode of my current server loop: DatagramPacket p; socket.receive(p); // now p contains the user's IP and port, and the data int key = getKey(p); if(key == 0) { // connection request key = makeKey(p); clients.add(key, p.ip); send(p.ip, p.port, key); // give the user his key } else { // user has a key // verify key belongs to that IP address // lookup the user's session data based on the key // react to the packet in the context of the session } When designing this, I kept in mind these points: Multiple users may exist on the same IP address, due to the presence of routers, therefore users must have a separate identification key. Packets can be spoofed, so the key should be checked against its original IP address and ignored if a different IP tries to use the key. The outbound port on the client side might change among packets. Is that third assumption correct, or can I simply assume that one user = one IP+port combination? Is this commonly done, or should I continue to create a special key like I am currently doing? I'm not completely clear on how TCP negotiates a connection so if you think I should model it off of TCP then please link me to a good tutorial or something on TCP's SYN/SYNACK/ACK mess. Also note, I do have a provision to resend a key, if an IP sends a 0 and that IP already has a pending key; I omitted it to keep the snippet simple. I understand that UDP is not guaranteed to arrive, and I plan to add reliability to the main packet handling code later as well.

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• cant send using postfix from external ip address

  - by daniel

  i have postfix set up as a satellite to listen on port 587 i can send email outside fine trough the postfix(ubuntu) box from the local network with no problems when i try to connect to the postfix(ubuntu) box from a external ip and send mail it spits back a 554 5.7.1 Relay access denied error i can telnet to it fine, just cant send mail this is my main.cf : smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no append_dot_mydomain = no readme_directory = no smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = smtp_use_tls = no myhostname = cotiso-desktop alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = mydomainname.com, cotiso-desktop, localhost.localdomain, localhost relayhost = smtp.mydomainname.com mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all inet_protocols = all there is no security set up yet, i'm just trying to get it working first any ideas? thanks in advance

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• Linux - use dhcp again to get IP

  - by Markus Orreilly

  I had statically set my ip in Linux using: sudo ifconfig eth0 192.168.blah.blah Now I want it to go back to using DHCP to assign the IP. How do I do that?

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• Rechability of Local LAN Ip on iPhone/iPad?

  - by x2on

  Hi, i want to check if an Webserver on on local lan ip is reachable. I checked Apple's Rechability Sample, but this sample says all local lan ip's are reachable. Any Ideas how to check this? Thank's

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• SSH into Ubuntu Linux on a box without a static IP address

  - by Steven Xu

  Basically, how do I do it? I'd like to connect to my home computer from work, but my internet is routed through my apartment building's network, so I don't have the static IP address I'm accustomed to having. How do I go about accessing my home computer through SSH (I'll be using Putty at work if it matters) if my home computer doesn't have a static IP address?

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• Seeking webcam with own IP address

  - by Mawg

  I am not sure if this is the correct place to post, but I couldn't find anywhere better. I am looking for a webcam/movie cam and this site seems more addressed to still images, but ... I am looking for a small, rugged web-cam which can be hand-held or perhaps head-mounted (failing that I can settle for a tripod mount, but I need portability). It must have its own IP address so that anyone can view its video stream from a web browser. I would prefer 2 way voice communication too. Encryption of data is nice, as is compression (H.264). Maybe also remote control, like causing it to zoom from the browser. Does anyone have any suggestions, even suggestions of somewhere else to look? Thanks very much in advance.

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• Capture RTSP stream from IP Camera and store

  - by Keerthi

  I've got a few IP Cameras which output an RTSP (h264 mpeg4) stream. Hitting the URL locally via VLC: rtsp://192.168.0.21:554/mpeg4 I can stream the camera and dump to disk (on my desktop). I'd like to however store these files on my NAS (FreeNAS). I was looking at ways to capture the RTSP stream and dump them to disk but I'm unable to find anything. Is it possible to capture the stream on FreeBSD or Linux (RaspberryPi) and dump the streamed content to a disk local to Linux or FreeBSD - preferably every 30minutes? EDIT: The NAS is headless (HP N55L or something) and the RaspberryPi's are headless too. I've already looked into ZoneMinder but need something small. I was hoping maybe using Motion to detect motion on the stream but that will come later.

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• TCP/IP over SSL and silverlight

  - by rahulchandran

  I want to write a silverlight page which connects to a tcp/ip server. The server is layering ssl as well. The problem is I don't see a SSLStream in Silverlight. Is this doable (I need the tcp/ip because this page will constantly get events from the server and no I don't want to poll, in fact I can't the server is third party) Thanks

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• Using PowerShell, in Active Direcotry, how would I change all the DNS A records that have a given IP to a new IP?

  - by djsumdog

  We've been moving data centers and I have a lot of old records that were not correctly but in DNS as CNAME records, but A records that have a direct IP (e.g. 192.168.100.n) and they're all moving to a new subnet (10.19.100.n). I just need to write a powershell script to change all those records. I found this site: http://www.indented.co.uk/index.php/2008/12/30/administering-microsoft-dns-in-powershell/ and from it I made this simple script: $dnsServer = "meldc2" $scope = New-Object Management.ManagementScope("\\$dnsServer\root\MicrosoftDNS") $path = New-Object Management.ManagementPath("MicrosoftDNS_Zone") $options = New-Object Management.ObjectGetOptions($Null,[System.TimeSpan]::MaxValue, $True) $ZoneClass= New-Object Management.ManagementClass($scope,$path,$options) $Zones = Get-WMIObject -Computer $dnsServer -Namespace "root\MicrosoftDNS" -Class "MicrosoftDNS_Zone" $Zones | Get-Member foreach($Z in $Zones) { $Z | Select-Object Name,DsIntegrated,ZoneType,Reverse,Data } but that only gets me a listing of root zones. I don't understand how to iterate over all the entries in each of the zones. Also, all the examples I've seen involve adding new zones, but there aren't any examples I can find on modifying existing A records.

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• Virtualhost setup, same IP address, different DirectoryIndex's

  - by kaykills

  I am trying to set up 2 virtual host entries in apache but I'm not sure how to accomplish what I want to do. I have two domain names, both pointing to the same IP Address. I need the DirectoryIndex to be different, which is pretty much the only difference in the entries. I have the following set up: <VirtualHost *:80> ServerName firstdomain.com ServerAdmin [email protected] DocumentRoot "/srv/www" DirectoryIndex /portals/site/index.html </VirtualHost> <VirtualHost *:80> ServerName seconddomain.com ServerAdmin [email protected] DocumentRoot "/srv/www" DirectoryIndex /portals/site/index_fr.html </VirtualHost> Not sure what I need to do differently but the second entry doesn't work. The only real difference is I need the second domain to point to a different DirectoryIndex. If there is a better way to accomplish this, your help would be appreciated.

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• Django: Get remote IP address inside settings.py

  - by Silver Light

  Hello! I want to enable debug (DEBUG = True) For my Django project only if it runs on localhost. How can I get user IP address inside settings.py? I would like something like this to work: #Debugging only on localhost if user_ip = '127.0.0.1': DEBUG = True else: DEBUG = False How do I put user IP address in user_ip variable inside settings.py file?

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• Connecting to a VirtualBox machine from the host, using an ip address

  - by Doron

  Hello, In a macbook host, I run VirtualBox having a guest ubuntu server, with a NAT network setting. In the virtual machine application "Parallels", I would get on the host an IP address of the guest, to which I could later set hostnames and access it directly. However, I couldn't find a way to accomplish this using VirtualBox. The only solution VirtualBox has for me, is to set port forwarding, and access "localhost" with these ports. How can I have the desired behavior set up, without having to change to a bridged network settings, and expose my guest computer to the network my host computer is connected to ? Thanks.

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• I am getting the wrong client IP address

  - by Vibin Jith

  I am running an ASP.NET application. The web server is located on the same system. In the code behind I just want to get the IP address of the requesting client. I am using this code: Request.UserHostAddress But I am getting a wrong address: 127.0.0.1. My system IP address is 198.162.0.27.

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• iptables: limiting bytes downloaded per IP per day?

  - by Miles

  On a public-facing web server, I'd like to limit the total bytes downloaded per IP address per day. For example, after a visitor downloaded 100MB, any additional requests would be dropped or rejected for the next 24 hours. Is it possible to accomplish this using iptables alone? The connbytes, connlimit, hashlimit, quota, and recent options all look promising, but the man page plays its cards close to the vest (e.g., "quota - Implements network quotas by decrementing a byte counter with each packet. --quota bytes The quota in bytes."). Would like to avoid using a proxy (like Squid) if possible.

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• Configure IIS 6 to deny access to specific file based upon IP address

  - by victorferreira

  Hello guys, We are using IIS 6 as our webserver. And we need to deny the access for one specif file, placed in only one specific URL, to everybody OUTSIDE the local network. In other words, if somebody is trying to access that filme/page from their own computer at home, using the internet, they must not succeed. But, if the same person try to do that at the same network of the web server, its ok. I am not sure about that, but Apache uses ORDER DENY,ALLOW. You specify the URL, allow or deny to all or to a range of IP. Any suggestions? Thanks!

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• Bad request - Invalid Hostname Error when using ARR IP address

  - by syloc

  I'm trying to setup a simple ARR system. I have 1 ARR machine load balancing between 2 APP servers. I can reach the app sites if i use the server name of the ARR machine. (http://arrserver/app) But i can't do it with its IP address. (http://10.7.10.25/app). It gives the "Bad Request - Invalid Hostname". In the ARR machine i configured the default site's bindings to "All Unassigned","80" (default values). Do i need to change the binding rule or need additional url rewrite rules? And also, in the ARR server http://127.0.0.1/app doesn't work. But http://localhost/app works fine. Thx in advance

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• how to change interface ip in ifconfig with /etc/network/interfaces

  - by user2478348

  Hi everybody when modifiying /etc/network/interfaces, saving it and then executing ifconfig i can't see the modification i made..for example here is part of my /etc/network/interfaces: auto wlan1 iface wlan1 inet static address 192.168.0.60 netmask 255.255.255.0 gateway 192.168.0.61 you can see that the IP address of my wlan1 is 192.168.0.60 but when typing ifconfig i have this: wlan1 Link encap:Ethernet HWaddr 00:19:70:0f:c2:9c inet adr:192.168.0.1 Bcast:192.168.0.255 Masque:255.255.255.0 adr inet6: fe80::219:70ff:fe0f:c29c/64 Scope:Lien UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Packets reçus:758 erreurs:0 :0 overruns:0 frame:0 TX packets:610 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 lg file transmission:1000 Octets reçus:73490 (73.4 KB) Octets transmis:127883 (127.8 KB) (the inet adr:192.168.0.1 and not 198.168.0.60)..if someone can help me I'll be very thankful :)

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• how to get Client IP address

  - by Anup Prakash

  How can i get Client IP address using php. I want to keep record of the user who logged into my website through his/her ip address. Please help me.

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• Configure IIS 6 to deny access to specific file based upon IP address

  - by victorferreira

  Hello guys, We are using IIS 6 as our webserver. And we need to deny the access for one specif file, placed in only one specific URL, to everybody OUTSIDE the local network. In other words, if somebody is trying to access that filme/page from their own computer at home, using the internet, they must not succeed. But, if the same person try to do that at the same network of the web server, its ok. I am not sure about that, but Apache uses ORDER DENY,ALLOW. You specify the URL, allow or deny to all or to a range of IP. Any suggestions? Thanks!

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• Nginx reverse proxy IP issue

  - by Tiffany Walker

  For some reason Apache is still seeing my SERVERS ip. Is this an nginx problem? /etc/nginx.conf user nobody; # no need for more workers in the proxy mode worker_processes 4; error_log /var/log/nginx/error.log info; worker_rlimit_nofile 20480; events { worker_connections 5120; # increase for busier servers use epoll; # you should use epoll here for Linux kernels 2.6.x } http { server_name_in_redirect off; server_names_hash_max_size 10240; server_names_hash_bucket_size 1024; include mime.types; default_type application/octet-stream; server_tokens off; disable_symlinks if_not_owner; sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 5; gzip on; gzip_vary on; gzip_disable "MSIE [1-6]\."; gzip_proxied any; gzip_http_version 1.1; gzip_min_length 1000; gzip_comp_level 6; gzip_buffers 16 8k; # You can remove image/png image/x-icon image/gif image/jpeg if you have slow CPU gzip_types text/plain text/xml text/css application/x-javascript application/xml image/png image/x-icon image/gif image/jpeg application/xml+rss text/javascript application/atom+xml; ignore_invalid_headers on; client_header_timeout 3m; client_body_timeout 3m; send_timeout 3m; reset_timedout_connection on; connection_pool_size 256; client_header_buffer_size 256k; large_client_header_buffers 4 256k; client_max_body_size 200M; client_body_buffer_size 128k; request_pool_size 32k; output_buffers 4 32k; postpone_output 1460; proxy_temp_path /tmp/nginx_proxy/; client_body_in_file_only on; log_format bytes_log "$msec $bytes_sent ."; include "/etc/nginx/vhosts/*"; } proxy.inc proxy_connect_timeout 59s; proxy_send_timeout 600; proxy_read_timeout 600; proxy_buffer_size 64k; proxy_buffers 16 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; proxy_pass_header Set-Cookie; proxy_redirect off; proxy_hide_header Vary; proxy_set_header Accept-Encoding ''; proxy_ignore_headers Cache-Control Expires; proxy_set_header Referer $http_referer; proxy_set_header Host $host; proxy_set_header Cookie $http_cookie; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-Host $host; proxy_set_header X-Forwarded-Server $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; vhost file: server { error_log /var/log/nginx/vhost-error_log warn; listen 63.6.1.12:80; server_name photo-rolldomain.com www.domain.com; access_log /usr/local/apache/domlogs/domain.com-bytes_log bytes_log; access_log /usr/local/apache/domlogs/domain.com combined; root /home/mtech/public_html; location / { location ~.*\.(3gp|gif|jpg|jpeg|png|ico|wmv|avi|asf|asx|mpg|mpeg|mp4|pls|mp3|mid|wav|swf|flv|html|htm|txt|js|css|exe|zip|tar|rar|gz|tgz|bz2|uha|7z|doc|docx|xls|xlsx|pdf|iso)$ { expires 7d; try_files $uri @backend; } error_page 405 = @backend; add_header X-Cache "HIT from Backend"; proxy_pass http://63.6.1.12:8081; include proxy.inc; } location @backend { internal; proxy_pass http://63.6.1.12:8081; include proxy.inc; } location ~ .*\.(php|jsp|cgi|pl|py)?$ { proxy_pass http://63.6.1.12:8081; include proxy.inc; } location ~ /\.ht { deny all; } }

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• How to get started setting up IP security cameras

  - by dave

  I have just finished renovating my house. As part of the job, I have cat6 cable run through the house, including two external plugs. All cables terminate in the same location. My rough plan is to plug two IP cameras to monitor the front and rear, run POE from a central router to the two external cameras, plug my PC into the same router and run magic software X. Any machine plugged into the router or wirelessly connection should then be able to get a live feed and alerts based on motion detection. That's the plan, but I'm not sure how possible it is. What hardware to get and what monitoring software to get. Has anyone does something similar? What were your experiences?

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• TCP/IP performance tuning under KVM/Qemu

  - by vpetersson

  With more and more companies switching to public cloud services, I'm curious what you guys' thoughts are on TCP/IP tuning in the cloud. Is it worth bothering with? Given that you don't have access to the host-server, you're somewhat limited I presume Let's say for the sake of the argument that you're running three MongoDB-servers in a replica-set on FreeBSD or Linux that all sync over an internal network. I'd also be curious if anyone made any actual performance benchmarks to back up their arguments. I benchmarked the various network drivers available for KVM/Qemu here, but I'm curious what the gurus here suggest to tune further. I started playing around a bit with the tuning-recommendations as suggested over here, but interestingly enough I saw a decrease in performance, rather than an increase, but perhaps I didn't fully understand the tweaks. Update: I did a few more benchmarks and posted the result here. Unfortunately the result wasn't really what I expected.

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• Iterate over IP addresses

  - by user80003

  Let's say I have two IP addresses (in .NET, the System.Net.IPAddress class). How can I iterate over all the IP addresses between two given addresses? For example, let one address be 192.168.1.1 and the other 192.168.2.3. I want to somehow iterate over all the addresses in between and print them to the console. Thank you.

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• Slow website load with CNAME, fast when using IP

  - by Nate Strandberg

  I setup two DNS servers on my network: ns1.byte-werx.com && ns2.byte-werx.com I can ping the DNS servers and get a fairly good response time, when I dig them I also get a fairly reasonable response, but any website I filter through them is painfully slow (an upwards of 20+ seconds) -- verifiable by performing a tracert or attempting to access the URL in a browser. The DNS servers are running CentOS 6.3 and BIND9 with 500MB of memory (I figure that should be more than enough?). I have a reverse look-up zone (1.168.192) along with two website zones (www.byte-werx.com and www.stayhomedental.com) If I access the websites using their IP the page loads nearly instantly so I do not believe the issue is with the hosting server, but that is running Ubuntu Server 12.04 and Apache2 with 12GB memory. Any thoughts? I do not have the named.conf file in front of me but I can edit this post to include it if you feel it would be useful. Thanks for any advice!

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