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  • Forwarding RDP via a Linux machine using iptables: Not working

    - by Nimmy Lebby
    I have a Linux machine and a Windows machine behind a router that implements NAT (the diagram might be overkill, but was fun to make): I am forwarding RDP port (3389) on the router to the Linux machine because I want to audit RDP connections. For the Linux machine to forward RDP traffic, I wrote these iptables rules: iptables -t nat -A PREROUTING -p tcp --dport 3389 -j DNAT --to-destination win-box iptables -A FORWARD -p tcp --dport 3389 -j ACCEPT The port is listening on the Windows machine: C:\Users\nimmy>netstat -a Active Connections Proto Local Address Foreign Address State (..snip..) TCP 0.0.0.0:3389 WIN-BOX:0 LISTENING (..snip..) And the port is forwarding on the Linux machine: # tcpdump port 3389 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 01:33:11.451663 IP shieldsup.grc.com.56387 > linux-box.myapt.lan.ms-wbt-server: Flags [S], seq 94663035, win 8192, options [mss 1460], length 0 01:33:11.451846 IP shieldsup.grc.com.56387 > win-box.myapt.lan.ms-wbt-server: Flags [S], seq 94663035, win 8192, options [mss 1460], length 0 However, I am not getting any successful RDP connections from the outside. The port is not even responding: C:\Users\outside-nimmy>telnet example.com 3389 Connecting To example.com...Could not open connection to the host, on port 3389: Connect failed Any ideas? Update Per @Zhiqiang Ma, I looked at nf_conntrack proc file during a connection attempt and this is what I see (192.168.3.1 = linux-box, 192.168.3.5 = win-box): # cat /proc/net/nf_conntrack | grep 3389 ipv4 2 tcp 6 118 SYN_SENT src=4.79.142.206 dst=192.168.3.1 sport=43142 dport=3389 packets=6 bytes=264 [UNREPLIED] src=192.168.3.5 dst=4.79.142.206 sport=3389 dport=43142 packets=0 bytes=0 mark=0 secmark=0 zone=0 use=2 2nd update Got tcpdump on the router and it seems that win-box is sending an RST packet: 21:20:24.767792 IP shieldsup.grc.com.45349 > linux-box.myapt.lan.3389: S 19088743:19088743(0) win 8192 <mss 1460> 21:20:24.768038 IP shieldsup.grc.com.45349 > win-box.myapt.lan.3389: S 19088743:19088743(0) win 8192 <mss 1460> 21:20:24.770674 IP win-box.myapt.lan.3389 > shieldsup.grc.com.45349: R 721745706:721745706(0) ack 755785049 win 0 Why would Windows be doing this?

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  • Customize rsyslogd messages to show the sender of the message; not the receiver

    - by Nimmy Lebby
    I'm forwarding the WiFi router's log messages to our sysadmin box (sb3). This is the stanza in /etc/rsyslog.conf: # WiFi router log :fromhost-ip, isequal,'10.3.291.2' /var/log/wifi-router.log & ~ However, the log looks like this: Dec 23 10:41:58 sb3 dnsmasq-dhcp[253]: DHCPACK(br0) 10.3.292.133 xx:xx:xx:xx:xx:xx dg-ipad I want to customize so that anything logged to wifi-router.log does not mention sb3 but indicates the sender of the log message. How would I do this?

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  • Having issues with flickering output to TV from Windows 7 laptop

    - by Nimmy Lebby
    I cannot tell why this is happening. I cannot get a pattern as to when it happens. Sometimes, I watch entire Hulu content without any interruptions. Other times, it happens 2-3 times in a span of 3 minutes. Then it stops for 10-15 minutes. Lenovo T410s Integrated graphics: Intel HD Graphics (Driver=8.15.10.2253, Video BIOS=2026.1) TV is a Zenith (does not happen with other laptop so doubt it's TV) TV connected to laptop using HDMI-to-DVI cable (previously was connected directly via DVI but I bought a new cable and it's still happening) Anyone could help me troubleshoot this? I'd greatly appreciate it. If you need more information, I'll be glad to provide it.

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  • Optimal file system type and mount options for an rsnapshot dedicated drive

    - by Nimmy Lebby
    We have an external USB 2 drive that we are using as a backup drive for our configuration. We use rsnapshot for the backups. It uses a few standard commands for managing snapshots: rm -rf: deletes expired snapshots mv: moves older snapshots down a slot cp -al: duplicates last snapshot to new slot rsync -a --delete --numeric-ids --relative: synchronizes new snapshot As you could see by the log below, the majority of the time is spent on the rm -rf and the cp -al steps: [25/Dec/2010:14:00:02] rsnapshot hourly: started [25/Dec/2010:14:00:02] echo 21012 > /var/run/rsnapshot.pid [25/Dec/2010:14:00:02] rm -rf /mnt/extdrive/snapshots/hourly.5/ [25/Dec/2010:14:15:48] mv /mnt/extdrive/snapshots/hourly.4/ /mnt/extdrive/snapshots/hourly.5/ [25/Dec/2010:14:15:48] mv /mnt/extdrive/snapshots/hourly.3/ /mnt/extdrive/snapshots/hourly.4/ [25/Dec/2010:14:15:48] mv /mnt/extdrive/snapshots/hourly.2/ /mnt/extdrive/snapshots/hourly.3/ [25/Dec/2010:14:15:48] mv /mnt/extdrive/snapshots/hourly.1/ /mnt/extdrive/snapshots/hourly.2/ [25/Dec/2010:14:15:48] cp -al /mnt/extdrive/snapshots/hourly.0 /mnt/extdrive/snapshots/hourly.1 [25/Dec/2010:14:23:32] rsync -a --delete --numeric-ids --relative /etc /mnt/extdrive/snapshots/hourly.0/sm4/ [25/Dec/2010:14:23:52] touch /mnt/extdrive/snapshots/hourly.0/ [25/Dec/2010:14:23:52] rm -f /var/run/rsnapshot.pid [25/Dec/2010:14:23:52] rsnapshot hourly: completed successfully My questions: I'm currently using ext4 for the filesystem. Maybe this is not the best choice from those available in Red Hat. Anyone have any recommendations that would speed up the process? The partition's mount options are sync,dirsync 1 2. Is there a way to optimize this since it's solely used for rsnapshot? Of course, reasoning would be greatly appreciated.

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  • What is the DNS root zone and domain?

    - by Nimmy Lebby
    This might seem like a silly question but I want to get my terminology correct. Please do not delete. I will be more than happy to delete the question myself once I (with the help of a few people I hope) get to a consensus: This was my understanding: DNS root zone = . DNS root domain = (nameless) However, after reading the Wikipedia article, I'm not so sure: A domain name consists of one or more parts, technically called labels, that are conventionally concatenated, and delimited by dots, such as example.com. So this would lead me to believe: DNS root zone = . DNS root domain = . DNS root label = (nameless) Does this make sense? What is your understanding?

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  • Explain to a Jr. SysAdmin what happens when a PC joins a Windows 2008 Domain

    - by Nimmy Lebby
    An ideal answer would at least include: Critical configuration of the PC before it could join How the PC finds the Domain servers What happens when the PC cannot find any domain servers What connections are made from the PC to the domain How the AD records the connection How the PC drops the connection/AD monitors for stale connections Difference in this process between Windows 2008 R2 and previous versions of Windows Server That is all I could think of for now but I'm sure, as answers come in, I'll think of more.

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  • Other then DDNS, can a fake primary DNS server break anything else?

    - by Nimmy Lebby
    I am aware that the primary server listed in SOA record has to be valid for DDNS to work. Is anyone aware of any other application that uses the SOA listed primary DNS server in one way or the other? By a fake primary server I mean either: Inaccessible by anything else other than secondary servers (this is called hidden primary correct? unsure). A completely fake domain name like dig +short soa spamhaus.org

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  • Serving static web files off a non-standard port

    - by Nimmy Lebby
    I'm close to deploying a Django project to production. I'm looking over some infrastructure decisions. Something that came up was serving static files with a different server such as lighttpd. However, we're starting off with a single dedicated server so our only option would be to use a non-standard port for the static file webserver. Is there precedence for this? I.e. Does anyone "big" do this? Any particular port I should use or shy away from using? Can anyone thing of some downsides of going this route?

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  • Digitizing notes?

    - by Nimmy Lebby
    I want to digitize my note taking. I was looking into using tablets or something of that sort but I feel that it would be too much of a challenge to type instead of actually writing my notes during meetings. That got me thinking into looking into something like LiveScribe. It looks neat but I don't know how it would work in the real world. How does OCR work with something like smart pens? How is the desktop applications? Any experience? Does anyone have an alternative suggestions? Positives and negatives? Any advice would be helpful.

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  • Automating MySQL configuration with kickstart

    - by Nimmy Lebby
    I've been testing deployment for a website with some virtual servers. I have most of my deployment steps done via kickstart file (package installation and user creation). However, for MySQL I have to: Run mysql_secure_installation (sets up root password, deletes anonymous users, disallows root login remotely, removes test databases) ./ Then, create the website's databases and the database user. I'm not sure if this is possible in kickstart---especially the prompts in mysql_secure_installation. Perhaps someone has some suggestions or examples?

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  • Django: Generating a queryset from a GET request

    - by Nimmy Lebby
    I have a Django form setup using GET method. Each value corresponds to attributes of a Django model. What would be the most elegant way to generate the query? Currently this is what I do in the view: def search_items(request): if 'search_name' in request.GET: query_attributes = {} query_attributes['color'] = request.GET.get('color', '') if not query_attributes['color']: del query_attributes['color'] query_attributes['shape'] = request.GET.get('shape', '') if not query_attributes['shape']: del query_attributes['shape'] items = Items.objects.filter(**query_attributes) But I'm pretty sure there's a better way to go about it.

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  • Send an email using python script

    - by nimmyliji
    Hi, Today I needed to send email from a Python script. As always I searched Google and found the following script that fits to my need. import smtplib SERVER = "localhost" FROM = "[email protected]" TO = ["[email protected]"] # must be a list SUBJECT = "Hello!" TEXT = "This message was sent with Python's smtplib." # Prepare actual message message = """\ From: %s To: %s Subject: %s %s """ % (FROM, ", ".join(TO), SUBJECT, TEXT) # Send the mail server = smtplib.SMTP(SERVER) server.sendmail(FROM, TO, message) server.quit() But when I tried to run the program, I got the following error message: Traceback (most recent call last): File "C:/Python26/email.py", line 1, in <module> import smtplib File "C:\Python26\lib\smtplib.py", line 46, in <module> import email.utils File "C:/Python26/email.py", line 24, in <module> server = smtplib.SMTP(SERVER) AttributeError: 'module' object has no attribute 'SMTP' How can i solve this problem? Any one can help me? Thanks in advance, Nimmy.

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  • Python script to get the datas from the flex application

    - by nimmyliji
    Hi, I am making a simple Python CGI script that collects data(in xml format) from a flex application and I want to insert it into the mysql database . In perl The script is looks like the following... my @samplexml=$cgi-param("Items"); my $data=$xml-XMLin("@samplexml"); foreach my $e(@{$data-{Group}}) { my $sample="Insert into details(title,Parent,Istreeitem) Values('$e-{title}','$e-{Parent}','$e-{IsTreeItem}')"; my $sam=$dbo-prepare($sample); $sam-execute(); } But I want to know how to write these codes in pytrhon script.... Any one can help me? Thanks in advance. Nimmy.

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  • Python script to get the data from the flex application

    - by nimmyliji
    Hi, I am making a simple Python CGI script that collects data(in xml format) from a flex application and I want to insert it into the mysql database . In perl The script is looks like the following... my @samplexml=$cgi->param("Items"); my $data=$xml->XMLin("@samplexml"); foreach my $e(@{$data->{Group}}) { my $sample="Insert into details(title,Parent,Istreeitem) Values('$e->{title}','$e->{Parent}','$e->{IsTreeItem}')"; my $sam=$dbo->prepare($sample); $sam->execute(); } But I want to know how to write these codes in pytrhon script.... Any one can help me? Thanks in advance. Nimmy.

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