[gentoo-user] the most secure shared network system? Coda/NFSv4/others?
Hello. My purpose of using a network file system is to back up my web server. For some special reason the backup application I am using need to directly access a mounted network file system rather then using a SSH connection. For me, security is the biggest concern. The backup script should be able to connect to web server through encrypted TCP connection. Other features like being robust, being able to handle 1000 connections, local cache, offline, flexible ACL ... are not important. In my case, what is the best network file system for me? NFSv4 can use TCP, however I cannot find crypto information about NFSv4, but I do find some info about encrypted RPC on google, probably that means if I use encrypted RPC then I got encrypted NFS? A small advantage of NFS over coda is that I already used NFS for years (is familiar with that). Also NFS has no status, that is, I can mount once, backup every night; if the office network is down and back, as long as it's not down during backup, I don't have to re-connect (re-mount). Our office network gets down and back automatically once several days, it's impossible to maintain a TCP connection for days. Coda seems to be the best choice because articles on the web suggested this file system is created with security in mind. But I never know any person using this in real life (not used widely) and is not familiar with it, thus I must ask for advice on this list. signature.asc Description: 这是信件的数 字签名部分
[gentoo-user] provide registration service on a headless server without web
Hello. I am running a server which currently unlike most other servers on the world, do not provide web service yet. Currently I need to allow users to register themselves. They first through a registration process get a username and password, get themselves their home directories under /home and then they can use ssh to login to the server to do a few things like search for addressbook. I think of two ideas: 1) write a script that runs on telnet port. users can run telnet, talk to the script which will ask a few questions like your fullname and username desired. If everything qualify, a user is created on the system. 2) write a web service that does the same. 1) is probably not save and 2) adds a little bit overhead and complecity of the system by adding a web service. Is there a standard registration routine I can use? That we I don't have to write my own script, which could be a security risk. Thanks! -- 锐业软服（国内业务） http://www.realss.cn Real SoftService http://www.realss.com 销售咨询(Sales Department):0086 592 20 99987 (Chinese, German, English) 国际业务(International Sales): 0086 10 8460 6011 (German and English) 联系：厦门大学科技园，嘉庚二号楼6楼 邮政：厦门大学2312号信箱（邮编361005） signature.asc Description: 这是信件的数 字签名部分
[gentoo-user] Does USB devices share bandwidth?
Hello. My old sparc server have a USB extension card, which provides two USB slots at the back of the machine, driving a USB printer on Slot A. This printer runs at heavy load. because it cannot print the documents as fast as we need, I wish to add another printer. In most casese, we need the two printer working together the same time rather then one after the other. The two USB slots provided by the USB card are both OHCI (some USB 1.x stuff, not USB 2.0). So far it seems one single printer uses up all the USB bandwidth (sometimes printer stop there several seconds wait for signal). What would happen if I put another Printer there? case A: the new printer uses the bandwidth on slot B, both run as fast as if they were the only USB printer; case B: the new printer share bandwidth with the old one, the result is both printer work 1/2 fast, that is equal to not having bought another printer at all. Which one is true? Thanks in advance:) -- gentoo-user@gentoo.org mailing list
[gentoo-user] Re: Does USB devices share bandwidth?
Thank you for all the answers so far:) Jarry explained the bandwidth a printer consume cannot be too high for USB 2.0 slots. This knowledge is very helpful, however at this moment the sparc box only have USB 1.x slot, driven by ohci, as I explained. Richard Fish kindly explained the mechanism behind print processing, a printer make take a lot of time to process the data already sent. In my case I completely forgot to mension I was using inkjets, the inkjet takes rastered image data produced by GutenPrint. Thus I assume most image processing is done on the print server, which is usually at 30% load when printing, that means it should be able to handle another printer. Richard also suggested upgrading to a network printer, so far it is a very good solution too for my case. I think James provided most helpful information for my case, and thank you for so detailed and careful explanation. As he suggested I try to look for more hadwar data. It turns that my USB device is not USB 2.0 but I also noticed the two USB slots have diferent membase and IRQ. I wish to compare the sparc station with my desktop. On my x86 desktop there are 4 USB slots, dmesg shows that two UHCI device discovered, further on each device, a uhub of two slots are discovered. From my understanding, the situation of Sharing bandwidth James described should happen between two USB devices on the one same chip, on one uhub. For two devices, they perhaps don't share resource. In my case, my two USB 1.0 slots seems to be hot using a uhub, shall the two printer compete for resource on this situation too? Another small question I hope someone with professional knowledge can help. I was told ECP/bidirectional printer cable can handle 2Mbps data transfer, that seems to be suggesting using parallel cable is as good as using USB1 cable (as USB1 is supposed to handle 1.2Mbps ony), or even better. Is it true? Here is my lsusb when I just tried to plug another USB printer and make all slots occupied. # lsusb Bus 002 Device 001: ID : Bus 002 Device 002: ID 03f0:1617 Hewlett-Packard Bus 001 Device 001: ID : Bus 001 Device 002: ID 04b8:0005 Seiko Epson Corp. Stylus Printer Here is part of my dmesg host/usb-ohci.c: USB OHCI at membase 0x1ff0052, IRQ 10,7d4 host/usb-ohci.c: usb-02:02.0, NEC Corporation USB usb.c: new USB bus registered, assigned bus number 1 hub.c: USB hub found hub.c: 3 ports detected host/usb-ohci.c: USB OHCI at membase 0x1ff00522000, IRQ 10,7d5 host/usb-ohci.c: usb-02:02.1, NEC Corporation USB (#2) usb.c: new USB bus registered, assigned bus number 2 hub.c: USB hub found hub.c: 2 ports detected hub.c: new USB device 02:02.0-1, assigned address 2 usb.c: USB device 2 (vend/prod 0x4b8/0x5) is not claimed by any active driver. usb.c: registered new driver hid hid-core.c: v1.8.1 Andreas Gal, Vojtech Pavlik [EMAIL PROTECTED] hid-core.c: USB HID support drivers usb.c: registered new driver usblp printer.c: usblp0: USB Bidirectional printer dev 2 if 0 alt 0 proto 2 vid 0x04B8 pid 0x0005 printer.c: v0.13: USB Printer Device Class driver -- gentoo-user@gentoo.org mailing list
[gentoo-user] Re: Does USB devices share bandwidth?
This is really making me puzzle: sappho ~ # lspci | grep USB :02:02.0 USB Controller: NEC Corporation USB (rev 41) :02:02.1 USB Controller: NEC Corporation USB (rev 41) :02:02.2 USB Controller: NEC Corporation USB 2.0 (rev 02) When the kernel boots it shows me that only ohci device is discovered, someone suggested that ohci only support USB 1.x. Now lspci shows the card has USB 2.0. I don't understand, does it work in the way that the card either work in 2.0 mode with one device, or USB 1.0 with two separate devices? What if I remove OCHI and add back only UHCI driver in the kernel? -- gentoo-user@gentoo.org mailing list
[gentoo-user] a star-map wallpaper?
Hello. Sorry for my English if there is a more correct way of saying Star map. By Star Map I mean something that shows the position of starts, as well as brightness. The more like photo, the better. Star moves in the sky all the time: 1) the star map in 20:00 is different from 21:00 2) the star map in today 20:00 is different from what it was yesterday 20:00 3) the star map in one city is different from in another city at the same time I am looking for an application dynamically change the backgroup of my gnome desktop, showing the correct starmap of the very city I am in, of the very day and correct moment. That might require the desktop image being replaced once 15 miniutes, that doesn't matter, that's what I need. Just U am too stupid to find it on the google, have anyone heard of such application before? The cloeset I could find is nightfall http://www.hs.uni-hamburg.de/DE/Ins/Per/Wichmann/Nightfall.html But still, that is too complicated and very accurite, what I really want is some fancy desktop decoration, and it's so much of a waste not having such a tool in an office that can see part of the sky. -- 锐业软服（国内业务） http://www.realss.cn Real SoftService http://www.realss.com 销售咨询(Sales Department):0086 592 20 99987 (Chinese, German, English) 国际业务(International Sales): 0086 10 8460 6011 (German and English) 联系：厦门大学科技园，嘉庚二号楼6楼 邮政：厦门大学2312号信箱（邮编361005） -- gentoo-user@gentoo.org mailing list
[gentoo-user] how does a pipe work? Which process wait for which one, or they don't actually wait each other?
Hello. This might be OT but I am pretty interested in this and being unlucky not able to find a real in-depth explanation of pipe on the Internet. How does pipe actually work? I mean, when there is a pipe like this: $ appA | appB What happen if appA produced output when appB is still busy processing the data and did not require any data from input? possibility 1) as long as appA can get the resource (CPU?), it simply keep outputing data, and this data is cached in memory, as long as there is enough memory, and will finally feed to appB when appB finished his business and begin to accept more data; possibility 2) as long as appB stop requiring data, appA is suspended, the resource goes to appB. appA is only given resource (CPU?) when appB finished his business and begin to accept more data; Which one is true? I know usually 1) and 2) makes no difference to most users, that's why the detail explanation of 1) or 2) is so hard to google out. In my case appA gets the data from another host who have very short timeout settings, appB is used to compress the data obtained from appA. the compression is very difficult, usually at 30Kbps, the network is very fast, around 10Mbps. appB compress the data tunck by tunck, if Linux actually works in mode 2), the network connection is dropped when the interval of two tuncks of appB compressing data is longer then the network timeout setting. appA acutally don't know how to restart connection from where it was dropped, thus understanding this difference makes sense to me. I made several experiements and my appA and appB both works fine, but I don't dare to share this appA/B to others unless I get the mechnism understood. Thank you in advance. -- gentoo-user@gentoo.org mailing list
