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  • How large should I make root, home, usr, var, and tmp partitions?

    - by Teddy Okidoki
    i install ubuntu server 10.04, have 64 Gb VHD. And want to separate partitions in this mode: /dev/xvda0 p on swap (2 Gb) /dev/xvda1a0 e on /boot (128 Mb) /dev/xvda1a1 e on / type ffs (local) /dev/xvda1a2 e on /usr type ffs (local, nodev) /dev/xvda1a3 e on /tmp type ffs (local, nodev) /dev/xvda1a4 e on /var/log type ffs (local, nodev) /dev/xvda1a5 e on /var type ffs (local, nodev, nosuid) /dev/xvda1a6 e on /home type ffs (local, nodev, nosuid, with quotas) /dev/xvda2 p on /new (local, nodev, nosuid, noexec) with rest of space ~50Gb. But i'ma stuck, and don't know what size to give to each folder. Also i want to encrypt partitions. Thank you for any tips. EDIT: System need minimum size, here will be installed about 10 apps like ufw, apache,mysql, chkrootkit and so on.

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  • What has 'rm -r ~' done to my home directory?

    - by GUI Junkie
    gedit creates hidden backup files ending with '~'. I wanted to do a recursive cleanup of my directory tree. The command rm *~ will delete all local files ending with '~' I thought rm -r *~ . would delete all files in the whole tree, but I typo-ed rm -r ~. There was a message some directory could not be deleted and I quit the command. The question is: What have I been deleting? I did notice that my Filezilla configuration was gone. Does this command delete all hidden directories from the home dir?

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  • Google indexed my home page incorrectly: How can I fix it?

    - by louis_coetzee
    I finished my website and launched it, I think I had a problem with my robots.txt - so I changed it to look like this: 03/08/2012 # Allows all bots Sitemap: http://www.mysite.co.za/sitemap.xml User-agent: * Disallow: /dashboard/ When I google my domain.co.za - I get this back: Home A description for this result is not available because of this site's robots.txt – learn more. You've visited this page 3 times. Last visit: 2012/08/15 Now since I fixed this and added a 301 redirect to redirect mysite.co.za to www.mysite.co.za I would love it if google bot would come do a visit. Is there anything I can do to get this fixed?

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  • How to work around the home directory changing to /root when using sudo?

    - by Nathanel Titane
    Hello everybody! With Natty coming out soon, I've been at work updating my deployment and self-config script to make my desktop on 11.04 run and look the way I want it to. One bummer is that dbus seems to have changed and does not permit, in the same manner Lucid and Maverick did, the authentication of the current user by terminal call using grep and cat. Ideally, to run the script, I would sudo -s and then launch it as # chmod +x install && ./install Instead of returning my user name.. it now returns root and applies changes to the root profile and aborts whenever paths do not correspond. Here is my script header: #!/bin/bash ON_USER=$(echo ~ | awk -F'/' '{ print $1 $2 $3 }' | sed 's/home//g') export $(grep -v "^#" ~/.dbus/session-bus/`cat /var/lib/dbus/machine-id`-0) if sudo -u $ON_USER test -z "$DBUS_SESSION_BUS_ADDRESS" ; then eval `sudo -u $ON_USER dbus-launch --sh-syntax --exit-with-session` fi RELEASE=$(lsb_release -cs) How could I make it return the actual user now that natty is coming? Thanks for the help

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  • How large should I make root, home, and swap partitions?

    - by starcorn
    Hello, I have a laptop with win7 installed. I have now made a 60gb partition which I want to install ubuntu into. The question I have, before I do the installation, is how large each of the root, swap, and home partition should be? I have read some place that root could be as small as 8GB, but isn't that too small? Since I guess beside ubuntu all the softwares installed will reside there as well? And I think I'm going to set my swap to be 2GB large. My main concern is how large should the root partition should be. I'm mainly going to use ubuntu for programming and browse the web.

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  • How can I remove the "Dash Home" icon from the Unity launcher?

    - by user27451
    My notebook has a widescreen display so vertical space is an absolute premium for me. When I installed Ubuntu 11.10 I was disappointed to see that a new icon confusingly named "Dash Home" had been added to the very top of the Unity launcher. I can't move it to the bottom (by dragging it) and it doesn't have a context menu with which to remove it (by unchecking "Keep In Launcher"). It's horrible. How can I remove it from the Unity launcher and reclaim the space that was taken from me? (I realize that if it's removed I'll have to open the dashboard with the super key - I'm fine with that)

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  • Iomega Home Media Network Hard Drive 1TB Cloud Edition failed, data recovery?

    - by lonbon69
    I have a Iomega Home Media Network Drive Cloud Edition 1TB that started clicking and then displayed a failure LED code Power LED and Red LED. I removed the SATA drive and inserted in a 'All in 1 HDD Docking Station' and connected to laptop by USB - Laptop has Win 7 OS. The dock is seen as drive E but cannot access and says 0% data etc. The drive does spin up when I power the dock. Web searches say the drive has EXT3 file system and to use Ubuntu to access drive. I have now setup a dual boot laptop but still do not see the drive using ubuntu. Is there something else I need to do to get it recognised etc. I really would like to recover the data, any suggestions please?

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  • fatal: http://myserverip/home/git/example.git/info/refs not found: did you run git update-server-i

    - by bobobobo
    I followed this example to set up a git repository on my server. It worked, and I successfully pushed my code to it. But now, how do I pull or clone? Using the docs, I tried git clone http://REMOTE_SERVER/home/git/example.git .. But for me, I'm getting: fatal: http://myserverip/home/git/example.git/info/refs not found: did you run git update-server-info on the server? I ran git-update-server info, but nothing changed Edit: Ah, hold on. I changed it to git clone ssh://REMOTE_SERVER/home/git/example.git and I'm getting something.. it wants my user/pass, but how do I make the server public then not requiring login?

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  • Remapping Home/End from PC to Mac Via Synergy is not client specific.

    - by DtBeloBrown
    This question asks about the end key but the answers give no examples: http://superuser.com/questions/60052/what-key-works-like-end-using-a-mac-with-synergy If they had, I am guessing that they would likely have run into this problem. Adding lines like the bottom two of this: section: options keystroke(End) = keystroke(Control+Right,myiMac) keystroke(Home) = keystroke(Control+Left,myiMac) to my synergy.sgc in MyDocuments on the winXP machine would work but causes the keys to stop functioning on the winXP machine. Unacceptable. I next tried a compromise: keystroke(End) = keystroke(Control+Right,myiMac); keystroke(End,myPc) keystroke(Home) = keystroke(Control+Left,myiMac); keystroke(Home,myPc) Expecting that to broadcast the keystrokes to both machines regardless of which one was the Active Screen. That and many other variations did not work. What am I doing wrong? Has someone actually done this?

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  • How do I mount a harddrive to my /home folder in OS X?

    - by Joachim Hedberg
    Im wondering how to mount my second HDD to my /home folder like you do in other *NIX systems, making the mount point just that folder and not a standard HDD. I am aware of the method of copying my /home folder and then telling OSX via System Preferences/Users & Groups to look for the folder in a different location. What I am wondering is if there is a way to properly mount the entire HDD to become nothing more than my /home. I don't want it to even show up in Finder as an HDD. Is this even possible?

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  • cygWin connect by SSH using RSA key; ssh.exe couldn't create /home/user/.ssh

    - by Kirzilla
    Hello, I'm using Win XP and I'm trying to connect by SSH to remote host using RSA key. I've investigated that cygWin recognizes Documents and Settings dir as home directory Z:\app\cwRsync\bin>cygpath -H /cygdrive/c/Documents and Settings I've created .ssh directory in Documents and Settings/user/.ssh and moved known_hosts, id_rsa, id_rsa.pub there. Now, I'm trying to connect via ssh.exe to remote host Z:\app\cwRsync\bin>ssh -p 22 [email protected] Could not create directory '/home/user/.ssh'. The authenticity of host '[remotehost.com]:22 ([remotehost.com]:22)' can't be established. RSA key fingerprint is f7:f4:2c:e0:c6:7e:d2:a4:45:70:63:df:bf:f2:84:46. Are you sure you want to continue connecting (yes/no)? What I'm doing wrong? Why ssh.exe couldn't create directory /home/user/.ssh? Thank you.

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  • Raspberry Pi: mvoe home & var folders to USB HDD?

    - by doni49
    I have a Raspberry Pi running raspian. I've installed Apache2, PHP & MySQL. Apache & MySQL are both configured to use sub-directories of /var. I'd like to use a directory on my USB HDD instead of my SD card. I'd also like to move the /home directory to the USB HDD. I'd like to avoid re-partioning my HDD if possible. I thought maybe I could use a symlink to tell raspian that /var is really at /media/USBHDD1/var and /home is really at /media/USBHDD1/home. I tried it last night but couldn't get it to work.

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  • Virtual box - How to add disks and move var, opt and home to them?

    - by Jarrod Roberson
    I created a CentOS 5.6 Guest OS Virtual Machine. I made the first disk 10GB, I am rapidly outgrowing it. It was suggested that I make disks for my /var, /opt and /home directories and move them so I can better manage the disks for backing up and what not. This sounds like a good idea. I know how to create the disks in Virtual Box. I have dug around Google and the internet in general and all my attempts at doing this have failed. Snapshots are awesome! I can get the drives fdisked, and I have had limited success mounting them to /mnt/var, /mnt/home and /mnt/opt, but even in single user mode ( init 1 ) I can't get the entire contents of the directories to move over, and then the machine won't reboot correctly. cd /var cp * -ax /mnt/var The /var directory in particular is not wanting to move everything to the new location. How do I format, mount and move the /var, /opt and /home to my new disks?

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  • What is the best way to setup a public and private wireless access point on the same home network?

    - by Dougman
    For my home network (with internet provided from a cable modem) I would like to setup a secure wireless access point that I use for all of my personal connections (home PC, iPhone, Xbox, etc) and also another public access point that friends and folks in the neighborhood may connect to (for good karma). I want to ensure that my private traffic cannot be accessed from users of the public access point. I currently have one router that is running the Tomato firmware that I use with WPA security. What is the best way to accomplish this kind of setup securely (if it is possible in a home environment)?

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  • Mini keyboard has no home/end keys; how to type them?

    - by Steve Crane
    Some months ago I needed a small keyboard and bought an Okion KM229 without noticing that it has no Home or End key. This makes it tricky to type as I'm so used to using these keys. I haven't yet figured out if there is a key combination that issues Home and End keystrokes. Does anyone have experience of these keyboards and know how to issue those keystrokes? The keyboard is used on a PC running Windows XP. I have used the contact form on the Okion USA web site to ask this question but received no response. Wikipedia suggests that Home and End keystrokes are issued with Fn-Left and Fn-Right on some limited size keyboards. I may have tried those but don't remember for sure. I will try them again though when I am on site again in a week or so. Any other thoughts would be welcomed in the meantime.

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  • cygWin connect by SSH using RSA key; ssh.exe couldn't create /home/user/.ssh

    - by Kirzilla
    I'm using Win XP and I'm trying to connect by SSH to remote host using RSA key. I've investigated that cygWin recognizes Documents and Settings dir as home directory Z:\app\cwRsync\bin>cygpath -H /cygdrive/c/Documents and Settings I've created .ssh directory in Documents and Settings/user/.ssh and moved known_hosts, id_rsa, id_rsa.pub there. Now, I'm trying to connect via ssh.exe to remote host Z:\app\cwRsync\bin>ssh -p 22 [email protected] Could not create directory '/home/user/.ssh'. The authenticity of host '[remotehost.com]:22 ([remotehost.com]:22)' can't be established. RSA key fingerprint is f7:f4:2c:e0:c6:7e:d2:a4:45:70:63:df:bf:f2:84:46. Are you sure you want to continue connecting (yes/no)? What I'm doing wrong? Why ssh.exe couldn't create directory /home/user/.ssh? Thank you.

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  • Can two Linux installations share the same /home partition?

    - by huahsin68
    I am currently using OpenSuse 11.4 and Windows XP in laptop. I was planning to remove the Windows and switch to install Kubuntu. My current situation is that I have my root (/) and /home partition separated in OpenSuse. Can I share the /home partition between OpenSuse and Kubuntu? How do I configure Kubuntu to use the existing /home partition during the installation? BTW, the most recent Kubuntu is using ext3 file system whereas my OpenSuse is using ext3. Will this a matter for me to install Kubuntu? Any other issue I need to take care of?

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  • Is it possible to use Linux to route between my office (which uses IPSec) and home network?

    - by Sam
    First of all, apologies if this seems vague - I'm not an admin of anything more than a home network. I have a Ubuntu box sitting on my network which does various odd tasks for me - svn serving, some file serving, Apache/MySQL/PHP which is all raring to go. I've started a new job and at the moment I'm using ShrewSoft VPN software to establish a VPN link to the office as I need it. I'd prefer to have something always running on my home network just for convenience. My home modem/router doesn't support holding a VPN connection open. What I would like to do is set up my Linux box to hold open a VPN connection to my office and keep it open permanently, and then all applicable traffic for the office be routed through this box. I'm not sure if this is possible, or how to configure the routing on the desktop PCs (Windows 7). Would appreciate any guides, etc that could help me out.

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  • Ubuntu: crypt user's home directory and protect from admin ?

    - by Luc
    I have the following problem: I need to run some scripts on a Ubuntu machine but I do not want those scripts to be visible by anybody. What could be the best way to do that ? I was thinking of the following: create a particular user Add the scripts in this user's home directory Protect + crypt the user's home directory = Can I run the script from outside if the directory is crypted ? Can superuser see the content of the home dir ? Is there a right way to do this ? UPDATE I thing the best way would be that root own those scripts. In this case I would need to allow an another user to modify the network configuration. Is it possible to ONLY provide network rights to a user ? (via sudo or else)

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  • Tracking my home IP from anywhere on the internet?

    - by oKtosiTe
    I have an ISP that serves semi-permanent IPv4 addresses. They can't promise fixed IP addresses, but unexpected changes are quite rare. This begs me to ask however: what would be the easiest/most reliable way to track my home IP address so I can access my (Windows 7) home server even in the case of an address change? Please note: for reasons that I don't want to go in to, I'd like to avoid using any "dynamic DNS" type services. Instead I'd prefer some way to perhaps have the home server leave an occasional/triggered "address stamp" on a remote, off-site server (by SSH, HTTP post or similar, preferably over an encrypted connection).

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  • pscp: how to copy a file from a windows machine to a non-home location on another windows machine?

    - by help
    I want to copy a file from C:\temp on MachineA to C:\final on MachineB. I tried to use the following command, but it gave me an error (permission denied): C:\PROGRA~1\putty\pscp.exe -i C:\PROGRA~1\cwRsync\home\rcadmin\.ssh\id_rsa_private.ppk [email protected]:C:\final\test.txt C:\temp\test.txt It turned out I can only access C:\users\direcpc in my source computer. So if I put the file in C:\users\direcpc\text.txt, then it would work: C:\PROGRA~1\putty\pscp.exe -i C:\PROGRA~1\cwRsync\home\rcadmin\.ssh\id_rsa_private.ppk [email protected]:/test.txt C:\temp\test.txt But I want to access any location on my source computer instead of just my user home directory, is there a way to do this?

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  • Symlink to /Documents /Pictures etc. in OS X Home Directory?

    - by Larry O'Brien
    I have just purchased a 120GB SSD with the intent of making it my boot drive. I'd like to keep it as lean as possible since, y'know, it's so small (Heaven help me). I've read Can I move my home folder in Mac OS X? and Moving Mac OS X user folders? which discourage moving the entire home dir to a data drive. Is it possible and less-dangerous to leave the home directory on the boot drive but move the big data directories to a slower drive and symlink to them? I have the same thoughts with the /Applications directory, but maybe I should make that a separate question?

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  • How to run webcam software only when I am not home (phone is not on the LAN)?

    - by endolith
    Currently I've got cron starting Motion when I typically leave for work, and then killing it when I typically get home, so I can watch my cat/burglars/etc. But it would be better if it could detect when I'm actually home and disable the webcam during those times, and enable it at other times. I was thinking my presence could be detected by my Android phone joining the LAN. So something like A script that checks every few minutes whether my phone's hostname or MAC address is currently on the LAN or A Tasker script on my phone that contacts the home computer in some way (simple web server?) when it joins a certain SSID or ... Any better ideas or advice about how to implement one of these?

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  • Optimizing a lot of Scanner.findWithinHorizon(pattern, 0) calls

    - by darvids0n
    I'm building a process which extracts data from 6 csv-style files and two poorly laid out .txt reports and builds output CSVs, and I'm fully aware that there's going to be some overhead searching through all that whitespace thousands of times, but I never anticipated converting about about 50,000 records would take 12 hours. Excerpt of my manual matching code (I know it's horrible that I use lists of tokens like that, but it was the best thing I could think of): public static String lookup(List<String> tokensBefore, List<String> tokensAfter) { String result = null; while(_match(tokensBefore)) { // block until all input is read if(id.hasNext()) { result = id.next(); // capture the next token that matches if(_matchImmediate(tokensAfter)) // try to match tokensAfter to this result return result; } else return null; // end of file; no match } return null; // no matches } private static boolean _match(List<String> tokens) { return _match(tokens, true); } private static boolean _match(List<String> tokens, boolean block) { if(tokens != null && !tokens.isEmpty()) { if(id.findWithinHorizon(tokens.get(0), 0) == null) return false; for(int i = 1; i <= tokens.size(); i++) { if (i == tokens.size()) { // matches all tokens return true; } else if(id.hasNext() && !id.next().matches(tokens.get(i))) { break; // break to blocking behaviour } } } else { return true; // empty list always matches } if(block) return _match(tokens); // loop until we find something or nothing else return false; // return after just one attempted match } private static boolean _matchImmediate(List<String> tokens) { if(tokens != null) { for(int i = 0; i <= tokens.size(); i++) { if (i == tokens.size()) { // matches all tokens return true; } else if(!id.hasNext() || !id.next().matches(tokens.get(i))) { return false; // doesn't match, or end of file } } return false; // we have some serious problems if this ever gets called } else { return true; // empty list always matches } } Basically wondering how I would work in an efficient string search (Boyer-Moore or similar). My Scanner id is scanning a java.util.String, figured buffering it to memory would reduce I/O since the search here is being performed thousands of times on a relatively small file. The performance increase compared to scanning a BufferedReader(FileReader(File)) was probably less than 1%, the process still looks to be taking a LONG time. I've also traced execution and the slowness of my overall conversion process is definitely between the first and last like of the lookup method. In fact, so much so that I ran a shortcut process to count the number of occurrences of various identifiers in the .csv-style files (I use 2 lookup methods, this is just one of them) and the process completed indexing approx 4 different identifiers for 50,000 records in less than a minute. Compared to 12 hours, that's instant. Some notes (updated): I don't necessarily need the pattern-matching behaviour, I only get the first field of a line of text so I need to match line breaks or use Scanner.nextLine(). All ID numbers I need start at position 0 of a line and run through til the first block of whitespace, after which is the name of the corresponding object. I would ideally want to return a String, not an int locating the line number or start position of the result, but if it's faster then it will still work just fine. If an int is being returned, however, then I would now have to seek to that line again just to get the ID; storing the ID of every line that is searched sounds like a way around that. Anything to help me out, even if it saves 1ms per search, will help, so all input is appreciated. Thankyou! Usage scenario 1: I have a list of objects in file A, who in the old-style system have an id number which is not in file A. It is, however, POSSIBLY in another csv-style file (file B) or possibly still in a .txt report (file C) which each also contain a bunch of other information which is not useful here, and so file B needs to be searched through for the object's full name (1 token since it would reside within the second column of any given line), and then the first column should be the ID number. If that doesn't work, we then have to split the search token by whitespace into separate tokens before doing a search of file C for those tokens as well. Generalised code: String field; for (/* each record in file A */) { /* construct the rest of this object from file A info */ // now to find the ID, if we can List<String> objectName = new ArrayList<String>(1); objectName.add(Pattern.quote(thisObject.fullName)); field = lookup(objectSearchToken, objectName); // search file B if(field == null) // not found in file B { lookupReset(false); // initialise scanner to check file C objectName.clear(); // not using the full name String[] tokens = thisObject.fullName.split(id.delimiter().pattern()); for(String s : tokens) objectName.add(Pattern.quote(s)); field = lookup(objectSearchToken, objectName); // search file C lookupReset(true); // back to file B } else { /* found it, file B specific processing here */ } if(field != null) // found it in B or C thisObject.ID = field; } The objectName tokens are all uppercase words with possible hyphens or apostrophes in them, separated by spaces. Much like a person's name. As per a comment, I will pre-compile the regex for my objectSearchToken, which is just [\r\n]+. What's ending up happening in file C is, every single line is being checked, even the 95% of lines which don't contain an ID number and object name at the start. Would it be quicker to use ^[\r\n]+.*(objectname) instead of two separate regexes? It may reduce the number of _match executions. The more general case of that would be, concatenate all tokensBefore with all tokensAfter, and put a .* in the middle. It would need to be matching backwards through the file though, otherwise it would match the correct line but with a huge .* block in the middle with lots of lines. The above situation could be resolved if I could get java.util.Scanner to return the token previous to the current one after a call to findWithinHorizon. I have another usage scenario. Will put it up asap.

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  • migrating Solaris to RH: network latency issue, tcp window size & other tcp parameters

    - by Bastien
    Hello I have a client/server app (Java) that I'm migrating from Solaris to RH Linux. since I started running it in RH, I noticed some issues related to latency. I managed to isolate the problem that looks like this: client sends 5 messages (32 bytes each) in a row (same application timestamp) to the server. server echos messages. client receives replies and prints round trip time for each msg. in Solaris, all is well: I get ALL 5 replies at the same time, roughly 80ms after having sent original messages (client & server are several thousands miles away from each other: my ping RTT is 80ms, all normal). in RH, first 3 messages are echoed normally (they arrive 80ms after they've been sent), however the following 2 arrive 80ms later (so total 160ms RTT). the pattern is always the same. clearly looked like a TCP problem. on my solaris box, I had previously configured the tcp stack with 2 specific options: disable nagle algorithm globally set tcp_deferred_acks_max to 0 on RH, it's not possible to disable nagle globally, but I disabled it on all of my apps' sockets (TCP_NODELAY). so I started playing with tcpdump (on the server machine), and compared both outputs: SOLARIS: 22 2.085645 client server TCP 56150 > 6006 [PSH, ACK] Seq=111 Ack=106 Win=66672 Len=22 "MSG_1 RCV" 23 2.085680 server client TCP 6006 > 56150 [ACK] Seq=106 Ack=133 Win=50400 Len=0 24 2.085908 client server TCP 56150 > 6006 [PSH, ACK] Seq=133 Ack=106 Win=66672 Len=22 "MSG_2 RCV" 25 2.085925 server client TCP 6006 > 56150 [ACK] Seq=106 Ack=155 Win=50400 Len=0 26 2.086175 client server TCP 56150 > 6006 [PSH, ACK] Seq=155 Ack=106 Win=66672 Len=22 "MSG_3 RCV" 27 2.086192 server client TCP 6006 > 56150 [ACK] Seq=106 Ack=177 Win=50400 Len=0 28 2.086243 server client TCP 6006 > 56150 [PSH, ACK] Seq=106 Ack=177 Win=50400 Len=21 "MSG_1 ECHO" 29 2.086440 client server TCP 56150 > 6006 [PSH, ACK] Seq=177 Ack=106 Win=66672 Len=22 "MSG_4 RCV" 30 2.086454 server client TCP 6006 > 56150 [ACK] Seq=127 Ack=199 Win=50400 Len=0 31 2.086659 server client TCP 6006 > 56150 [PSH, ACK] Seq=127 Ack=199 Win=50400 Len=21 "MSG_2 ECHO" 32 2.086708 client server TCP 56150 > 6006 [PSH, ACK] Seq=199 Ack=106 Win=66672 Len=22 "MSG_5 RCV" 33 2.086721 server client TCP 6006 > 56150 [ACK] Seq=148 Ack=221 Win=50400 Len=0 34 2.086947 server client TCP 6006 > 56150 [PSH, ACK] Seq=148 Ack=221 Win=50400 Len=21 "MSG_3 ECHO" 35 2.087196 server client TCP 6006 > 56150 [PSH, ACK] Seq=169 Ack=221 Win=50400 Len=21 "MSG_4 ECHO" 36 2.087500 server client TCP 6006 > 56150 [PSH, ACK] Seq=190 Ack=221 Win=50400 Len=21 "MSG_5 ECHO" 37 2.165390 client server TCP 56150 > 6006 [ACK] Seq=221 Ack=148 Win=66632 Len=0 38 2.166314 client server TCP 56150 > 6006 [ACK] Seq=221 Ack=190 Win=66588 Len=0 39 2.364135 client server TCP 56150 > 6006 [ACK] Seq=221 Ack=211 Win=66568 Len=0 REDHAT: 17 2.081163 client server TCP 55879 > 6006 [PSH, ACK] Seq=111 Ack=106 Win=66672 Len=22 "MSG_1 RCV" 18 2.081178 server client TCP 6006 > 55879 [ACK] Seq=106 Ack=133 Win=5888 Len=0 19 2.081297 server client TCP 6006 > 55879 [PSH, ACK] Seq=106 Ack=133 Win=5888 Len=21 "MSG_1 ECHO" 20 2.081711 client server TCP 55879 > 6006 [PSH, ACK] Seq=133 Ack=106 Win=66672 Len=22 "MSG_2 RCV" 21 2.081761 client server TCP 55879 > 6006 [PSH, ACK] Seq=155 Ack=106 Win=66672 Len=22 "MSG_3 RCV" 22 2.081846 server client TCP 6006 > 55879 [PSH, ACK] Seq=127 Ack=177 Win=5888 Len=21 "MSG_2 ECHO" 23 2.081995 server client TCP 6006 > 55879 [PSH, ACK] Seq=148 Ack=177 Win=5888 Len=21 "MSG_3 ECHO" 24 2.082011 client server TCP 55879 > 6006 [PSH, ACK] Seq=177 Ack=106 Win=66672 Len=22 "MSG_4 RCV" 25 2.082362 client server TCP 55879 > 6006 [PSH, ACK] Seq=199 Ack=106 Win=66672 Len=22 "MSG_5 RCV" 26 2.082377 server client TCP 6006 > 55879 [ACK] Seq=169 Ack=221 Win=5888 Len=0 27 2.171003 client server TCP 55879 > 6006 [ACK] Seq=221 Ack=148 Win=66632 Len=0 28 2.171019 server client TCP 6006 > 55879 [PSH, ACK] Seq=169 Ack=221 Win=5888 Len=42 "MSG_4 ECHO + MSG_5 ECHO" 29 2.257498 client server TCP 55879 > 6006 [ACK] Seq=221 Ack=211 Win=66568 Len=0 so, I got confirmation things are not working correctly for RH: packet 28 is sent TOO LATE, it looks like the server is waiting for packet 27's ACK before doing anything. seems to me it's the most likely reason... then I realized that the "Win" parameters are different on Solaris & RH dumps: 50400 on Solaris, only 5888 on RH. that's another hint... I read the doc about the slide window & buffer window, and played around with the rcvBuffer & sendBuffer in java on my sockets, but never managed to change this 5888 value to anything else (I checked each time directly with tcpdump). does anybody know how to do this ? I'm having a hard time getting definitive information, as in some cases there's "auto-negotiation" that I might need to bypass, etc... I eventually managed to get only partially rid of my initial problem by setting the "tcp_slow_start_after_idle" parameter to 0 on RH, but it did not change the "win" parameter at all. the same problem was there for the first 4 groups of 5 messages, with TCP retransmission & TCP Dup ACK in tcpdump, then the problem disappeared altogether for all following groups of 5 messages. It doesn't seem like a very clean and/or generic solution to me. I'd really like to reproduce the exact same conditions under both OSes. I'll keep researching, but any help from TCP gurus would be greatly appreciated ! thanks !

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