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• TCPDump and IPTables DROP by string

  - by Tiffany Walker

  by using tcpdump -nlASX -s 0 -vvv port 80 I get something like: 14:58:55.121160 IP (tos 0x0, ttl 64, id 49764, offset 0, flags [DF], proto TCP (6), length 1480) 206.72.206.58.http > 2.187.196.7.4624: Flags [.], cksum 0x6900 (incorrect -> 0xcd18), seq 1672149449:1672150889, ack 4202197968, win 15340, length 1440 0x0000: 4500 05c8 c264 4000 4006 0f86 ce48 ce3a E....d@[email protected].: 0x0010: 02bb c407 0050 1210 63aa f9c9 fa78 73d0 .....P..c....xs. 0x0020: 5010 3bec 6900 0000 0f29 95cc fac4 2854 P.;.i....)....(T 0x0030: c0e7 3384 e89a 74fa 8d8c a069 f93f fc40 ..3...t....i.?.@ 0x0040: 1561 af61 1cf3 0d9c 3460 aa23 0b54 aac0 .a.a....4`.#.T.. 0x0050: 5090 ced1 b7bf 8857 c476 e1c0 8814 81ed P......W.v...... 0x0060: 9e85 87e8 d693 b637 bd3a 56ef c5fa 77e8 .......7.:V...w. 0x0070: 3035 743a 283e 89c7 ced8 c7c1 cff9 6ca3 05t:(>........l. 0x0080: 5f3f 0162 ebf1 419e c410 7180 7cd0 29e1 _?.b..A...q.|.). 0x0090: fec9 c708 0f01 9b2f a96b 20fe b95a 31cf ......./.k...Z1. 0x00a0: 8166 3612 bac9 4e8d 7087 4974 0063 1270 .f6...N.p.It.c.p What do I pull to use IPTables to block via string. Or is there a better way to block attacks that have something in common? Question is: Can I pick any piece from that IP packet and call it a string? iptables -A INPUT -m string --alog bm --string attack_string -j DROP In other words: In some cases I can ban with TTL=xxx and use that should an attack have the same TTL. Sure it will block some legit packets but if it means keeping the box up it works till the attack goes away but I would like to LEARN how to FIND other common things in a packet to block with IPTables

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• Google account gives ERR_SSL_BAD_RECORD_MAC_ALERT errors

  - by Kjensen

  A couple of days ago, I started being unable to connect to accounts.google.com, which handles logins to all kinds of google services. I get this error in Chrome: Error 126 (net::ERR_SSL_BAD_RECORD_MAC_ALERT): Unknown error. In IE I get this: I assume it is the same error, just wrapped up. I run Win8 RTM. On the SAME machine, using the same network card, in a VMWare workstation image running Win7, I am able to connect perfectly. On another of my machines on my network, I am also still able to connect with no problem. My girlfriend uses the same network and has also complained a couple of times about this error (google calendar) - but this is anecdotal, since her technical troubleshooting abilities stop at "xxxx is broken". Her machine runs Win7. ;) I have rebooted, cleared cookies, do not run any antivirus/firewall, have not changed network config. The first 3-4 days after installing Win8, I did not have any problems. I have also searched, and found a hint about enabling SSL2.0 in connection settings, which did not help. Anybody know something about this error and what I can do to fix it?

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• will heavy network traffic affect other connections on HP ProCurve V1810-48G?

  - by nn4l

  I have a HP ProCurve V1810-48G switch with a few servers connected to it (everything in one rack). The switch is practically in its default configuration. During copying of a few hundred GByte of data from server_a to server_b (using tar cf - data | ssh server_b 'cd myhome; tar xf -'), essentially saturating the network capacity between those two servers, I noticed network related error messages on the console of server_c - as if server_c is no longer able to send/receive traffic to server_d. After canceling the copy command everything was normal again. I would understand this if the network connection would use a shared resource, for example if server_a and server_c are in one datacenter, server_b and server_d are in another datacenter and both datacenters are connected with a 100 MBit line. But all of the mentioned servers are connected to the same switch and are located in the same IP network. I always thought that a connection between two servers on one switch will not affect any other server connected to the switch. It is also possible that the network related error messages are caused by something else - but I can't risk a network problem for any other system on this switch. Please advise.

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• How to connect to IIS and SQL Server Express on Windows 7 host from XP Mode

  - by SpatialBridge

  Hello, I am running IIS and SQL Server 2008 Express on my Windows 7 host, and I'd like to be able to connect to them in XP Mode. My host machine is not a part of a domain, only a workgroup. So far, I've tried these instructions on connecting to SQL Server, but I'm not able to telnet to port 1433 on the host from XP Mode. I'm also not able to connect using a SQL client. I'm not able to connect to IIS on the host from XP Mode. Advice from those who have had success doing this would be appreciated. Thanks, Jon.

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• Linux: prevent outgoing TCP flood

  - by Willem

  I run several hundred webservers behind loadbalancers, hosting many different sites with a plethora of applications (of which I have no control). About once every month, one of the sites gets hacked and a flood script is uploaded to attack some bank or political institution. In the past, these were always UDP floods which were effectively resolved by blocking outgoing UDP traffic on the individual webserver. Yesterday they started flooding a large US bank from our servers using many TCP connections to port 80. As these type of connections are perfectly valid for our applications, just blocking them is not an acceptable solution. I am considering the following alternatives. Which one would you recommend? Have you implemented these, and how? Limit on the webserver (iptables) outgoing TCP packets with source port != 80 Same but with queueing (tc) Rate limit outgoing traffic per user per server. Quite an administrative burden, as there are potentially 1000's of different users per application server. Maybe this: how can I limit per user bandwidth? Anything else? Naturally, I'm also looking into ways to minimize the chance of hackers getting into one of our hosted sites, but as that mechanism will never be 100% waterproof, I want to severely limit the impact of an intrusion. Cheers!

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• Translating debian network configuration to gentoo

  - by thpetrus

  I just got rid off Debian on my VPS (OpenVZ) and installed Gentoo on it, however it is a plain Gentoo image without further configuration, i.e. no working network. I'm not familiar with Debian and coulnd't figure out how to get the network set up, these are the debian network files /etc/network/interfaces: auto venet0 iface venet0 inet manual up ifconfig venet0 up up ifconfig venet0 127.0.0.2 up route add default dev venet0 down route del default dev venet0 down ifconfig venet0 down iface venet0 inet6 manual up ifconfig venet0 add ipv6addr/128 down ifconfig venet0 del ipv6addr/128 up route -A inet6 add default dev venet0 down route -A inet6 del default dev venet0 auto venet0:0 iface venet0:0 inet static address external_ip netmask 255.255.255.255 auto venet0:1 iface venet0:1 inet static address internal_ip netmask 255.255.255.255 Please note that external_ip, internal_ip and ipv6addr are placeholders. I copied the /etc/resolv.conf, know the gateway_ip and also have another ouput of ifconfig, if necessary. This is what I came up with, /etc/conf.d/net: config_venet0="127.0.0.2 netmask 255.255.255.255 brd 0.0.0.0" config_venet0:0="external_ip netmask 255.255.255.255 brd 0.0.0.0" route_venet0:0="default via gateway_ip" config_venet0:1="internal_ip netmask 255.255.255.255 brd 0.0.0.0" Broadcast IP is taken from ifconfig debian output - however it doesn't work. A symbolic link net.venet0:0 -> net.lo in /etc/init.d/ was created and I added net.venet0:0 to the boot runlevel.

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• Why would my wireless cut in and out every minute or so?

  - by Strilanc

  I've been having problems with my wireless. I moved to a new apartment, and the wireless seems incredibly unreliable. Sometimes it will be stable for hours until, all of a sudden, it starts cutting in and out. I'll get 30-90 seconds of normal behavior, then 5-30 seconds of nothing, then repeat. Sometimes the connection will stop working entirely, until I power-cycle the router. It is extremely, extremely annoying. Surfing the web isn't too bad, assuming you can stand the random 5-30 second waits. But some connections are sensitive enough to timeout, and it certainly makes multiplayer games unplayable. Facts: I confirmed the problem using ping google.com -t. I get normal traffic, interspersed with bursts of "Request timed out.". I've never had this problem before with this laptop. I didn't bring my own router or modem to the apartment. I'm using what the old tenant had. Hooking directly to the modem via an ethernet cable results in a stable connection. Temporarily cutting power to the router sometimes fixes the problem. Sometimes it doesn't. I reset the router, but the problem remained. Apparently the previous tenant had issues with the internet, but I don't know what they were specifically. The router is a D-Link DIR-615, and their tech support is useless.

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• Determining the required depth and specifications for a server cabinet

  - by Bingu Bingme

  I'm trying to understand the considerations ("why") that go into determining the specifications ("what") for a rackmount server cabinet, in order to determine what sort of rack I should purchase for my home use. Since this is for home use, I won't be following certain best practices (eg. hot/cold aisle, not even air conditioning) and may be willing to sacrifice in various areas in order to reduce cost and footprint - but please advise if there are safety concerns or other considerations to note. The most basic specs for a server cabinet are the dimensions (external width x external depth x usable height). Width: commonly 600mm or 800mm (if the use case requires extra clearance around the sides, such as if there is lots of cabling). In my case and most common cases, I'm going to stick with 600mm. Height: Select a sufficiently tall rack to fit my equipment. But how much may I stuff into it? Eg, if there is a 15U rack, can I really populate it with 15U of servers, or should I leave 1U at top and bottom for air circulation? Depth: Racks commonly have external depth of 600mm (network equipment), 800mm, 1000mm, or even longer. I'm trying to see how to fit into the 800mm depth. With reference to http://www.server-racks.com/rack-mount-depth.html, I'm hoping to have the front and rear posts mounted ~ 28.5" (72cm) apart, which would leave only 8cm for front space and rear space. How much rear space (from rear posts to back of rack) do I really need? I won't use cable management arms, so can I mount a 72cm depth server since the power, KVM, network cables won't take up much depth? My most important equipment are all < 60cm depth (4U chassis) and should comfortably fit within the 800mm cabinet. The rest of the equipment are very old 1U servers that range from 65-72cm depth. I might still want to make further use of them, or I might discard them since they are so old. Even if the 72cm servers cannot be powered on in an 800mm rack, I should be able to use them as 1U shelves. But, what server depth can I expect to be able to operate? Or am I forced to upgrade to 1000mm depth racks in order to use any servers deeper than 60cm? With reference to best practices for HP racks, some other specs and installation considerations: There aren't any minimum recommendations for clearance on the sides of the rack. It is recommended to leave 48" front clearance. The 48" front clearance is based on 32" chassis depth, 13" to extend the rack rails and mate the inner/outer rails, and 3" for movement. If I don't use such rails (eg, use shelves instead), it should be sufficient to leave front clearance of chassis depth + 3". It is recommended to leave 30" rear clearance "to provide space for servicing the rack". I'm planning to back the rack into a corner of the room, and wheel it slightly out when I need to access the rear. If the wheeling plan is ok, I still need to know how much rear clearance is required for air circulation and ventilation purposes. Castor wheels and stabilising feet. Since I'm backing the rack into a corner of the room, I'll only be able to set the stabilising feet on the front corners. Thoughts on safety? The rack that I'm considering has front glass doors with side ventilation slits and fully perforated rear doors. I'm hoping this will be a good balance between temperature and noise (only ventilation slits facing out the front, while the rear is facing the walls). Or is the sound of high-rpm fans going to escape through the front slits anyway and destroy my sanity?

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• something is downloading in background Linux

  - by wisdom

  My laptop boots normally to Linux -LinuxMint- and immediately I like to open gnome-system-monitor but the shock is that something is downloading(the problem has been out 2 days ago) and nothing I run yet ! I did iftop in terminal but nothing strange -a screen shot provided-, also I tried nethogs which showed nothing at all. The more complicated when I reboot and same problem is there so I can't browse/surf Internet, no one connected to my network can browse any more it's absorbing the stream horribly! After many reboots it will go to normal state(no background downloading). But really I can't figure out the problem going behind the scene ! Any suggestion,any help would be appreciated...thanks

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• OpenWrt Backfire 10.03 Frequently Becoming Unresponsive (Bridged Client)

  - by Christopher Parker

  I have a Linksys WRT54G version 2 that I've flashed with OpenWrt Backfire 10.03. It's acting as a bridged client using the wl.o driver to give me network access in my home office, which is in a far corner of my house in a position that would make it exceedingly difficult to fish network cabling in through the walls. I have three network-ready devices attached to the device that don't currently support WiFi, including a networked printer. Ever since I migrated from WhiteRussian, which was also set up as a bridged client, to Backfire, the device has been becoming unresponsive, as though the OS itself has crashed or frozen. The WLAN light becomes completely solid and the LAN lights stay mostly solid, blipping off and then back on again maybe once a second or so. They all blink more or less in unison. Is there some way I can diagnose why this is happening so I can fix it? Right now, the only way to fix it is to unplug the device and plug it back in.

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• 10 GigE interfaces limits single connection throughput to 1 Gb on a ProCurve 4208vl

  - by wazoox

  The setup is as follow : 3 Linux servers with Intel CX4 10 GigE controllers and an X-Serve with a Myricom 10 GigE CX4 controller are connected to a ProCurve 4208vl switch, with a myriad of other machines connected through good ol' 1000 base-T. The interfaces are actually set up as 10 Gig, according to both the switch monitoring interface and the servers (ethtool, etc). However a single connection between two 10 GigE equipped machines through the switch is limited to exactly 1Gb. If I connect two of the 10 GigE machines directly with a CX4 cable, netperf reports the link bandwidth as 9000 Mb/s. NFS achieves about 550 MB/s transfers. But when I'm using the switch, the connection tops at 950 Mb/s through netperf and 110 MB/s with NFS. When I open several connections from 3 of the machines to the 4th, I get 350 MB/s of NFS transfer speed. So each individual 10 GigE ports actually can reach much more than 1 Gb, but individual connections are strictly limited to 1 Gb. Conclusion : the 10 GigE connection through the switch behaves exactly like a trunk of 10 1 Gb connections. That doesn't make any sense to me, unless HP planned these ports only for cascading switches or strictly for many-clients-to-single-server connection. Unfortunately this is NOT the envisioned setup, we need big throughput from machine to machine. Is this a not-so-known (or carefully hidden...) limitation of this type of switch? Should I suggest seppuku to the HP representative? Does anyone have any idea on how to enable a proper behaviour ? I upgraded for an hefty price from bonded 1Gb links to 10 GigE and see exactly ZERO gain! That's absolutely unacceptable.

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• Easy shorewall question : allow ips to DNAT

  - by llazzaro

  Hello, At my home network I had a transparent proxy. This is the rule that forward all 80 traffic to my squid3.1 server at DMZ DNAT loc:!10.0.0.126 dmz:172.16.0.198:3128 tcp 80 - !172.16.0.198 Ok, I need to add more ips to avoid transparent proxy. I tried loc:!10.0.0.134,!10.0.0.126...but didnt work (also similars like [ip0,ip1]. I tried to google the answer cant find it (sorry no matches, not searching the right keywords) also I tried to read the docs, but they are really long (and indexes dont help me). Thanks!

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• Bandwidth Suggestion

  - by Campo

  I have been asked to analyze the bandwidth usage of a company and make a recommendation for upgrading their Internet connection(s). Here is the layout 3 DLS lines so it is 3x(6 Down, 1 Up Each) into a load balancer out to the office's network. 30 VOIP phones run on a T1 (1.5 Down, 1.5 Up) The users at the company are heavily uploading. It is my suspicion that the issue in slowdown is being cause by multiple people uploading and others not being able to get requests out for even simple http requests. My initial idea is to get them a fiber line with a 10 down and 10 up. What do others think on this plan? Will that be enough to host their network traffic? What do I do about the VOIP line afterward? The fiber is expensive and I know the T1 does a great job for their VOIP so I do not want to suggest a DSL line because I know it may not be sufficient. I would also like to save them some money if I can. Maybe even get a faster fiber line and forgo the T1. Though I know their load balance/switch can only handle 20MB/S throughput. Looking for some confirmation/suggestions on my plan. I am planning on going in to get some real diagnostic numbers. Any suggestions on software to use for that? Preferably Windows software.

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• Windows 7 Homegroups not working?

  - by Jonas

  I've got a homegroup set up, and only the accounts/machines where the user and password is identical can see/share files. I thought the setting to let homegroup control the accounts would make that requirement unnecessary....am I missing something? To be clear: I can see the other machines/user accounts in my homegroup listing, but I can't see any of the files in their shared libraries.

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• Solaris 10 invalid ARP requests from 0.0.0.0? Link up/down every hour or 2

  - by JWD

  The guys at the data center where I'm hosting a server running Solaris 10 are telling me that my server is making a lot of invalid arp requests. This is an example of a portion of what was sent to me from the logs (with Mac addresses and IP addresses changed). [mymacaddress]/0.0.0.0/0000.0000.0000/[myipaddress]/[Datestamp]) It's being logged every hour. I don't see anything in the arp tables (arp -a) or routing tables (netstat -r) and I don't see anything relating to 0.0.0.0 when snoping the arp requests. The only place I see any reference to 0.0.0.0 is if I do netstat -a for the SCTP SCTP: Local Address Remote Address Swind Send-Q Rwind Recv-Q StrsI/O State ------------------------------- ------------------------------- ------ ------ ------ ------ ------- ----------- 0.0.0.0 0.0.0.0 0 0 102400 0 32/32 CLOSED But not really sure what that means. Doesn't seem like I can disable SCTP. There are some tunable SCTP parameters but it's not something I'm familiar with. Do I have to add changes to /etc/system? Looks like sctp_heartbeat_interval might be what I need to change? If it makes any difference, I have a few solaris zones running on this server, each with their own IP address on a virtual interface. eth0:0, eth0:1, etc. Does anyone have any idea what might be causing this and how to stop it? I think the switch I'm connected to doesn't like it and momentarily drops the connection. Is there anyway to at least block those requests using ipfilter or something else? Update: This was happening more frequently but now it seems to be happening roughly every hour or every two hours. It's not consistent. I tried setting setting the link speed and duplex to match the switch port and that seemed to make it stop happening for a few hours but then it started again.

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• How do I keep a bridge enabled on a bonded interface?

  - by jlawer

  I'm working on setting up a pair of CentOS 6.3 servers that will run a couple of KVM vms and have come across a problem setting up a bridge on a bond. I am using Mode 4 (802.3ad) bonding on a pair of stacked Dell Powerconnect 5524 switches connecting to R320 servers. There are 2 links (1 to each switch) that form a Link Aggregation Group (802.3ad / LACP bonding). On top of the bond I have VLAN Tagging. I've verified this is a problem on multiple other bonding modes so it isn't just a mode 4 issue. I am testing what happens when 1 link is dropped (ie switch dies, cable breaks, etc). If I don't have a bridge (for KVM), everything works fine, failover happens as expected. If I have the bridge enabled, it works fine until failover (unplugging a cable). When failover happens /var/log/messages shows the slave link going down, followed within a second by: kernel: br1: port 1(bond0.8) entering disabled state The thing is /proc/net/bonding/bond0 shows the link is up as expected (simply with only 1 slave instead of 2). If I plug the cable back in it recovers and brings the bridge back to an enabled state. I actually have tested this while a ping is occuring and if the timing is right a packet will actually leave the system after the link is lost, but before the disabled message occurs. This disabled state I assumed was STP, but I have disabled STP on the bridge configuration and this issue still occurs. brctl showstp br1 still shows the link as disabled when it is running without a slave. I also switched between the nics in the server (I have 2x Broadcom & 4x intel). It doesn't matter which configuration I have. Does anyone know of a way to force the bridge to stay enabled or why its detecting the bond as disabled, when it isn't?

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• Oracle RAC interconnect in a Dell M1000e Blade Enclosure

  - by Antitribu

  We are looking at a Dell M1000e enclosure and appropriate Blades with 4 NICs each. We are planning on running Linux/Oracle 11g RAC on two blades, storage will be handled on an iSCSI SAN for which two NICs (via passthrough) will be connected leaving us with two NICs (via blade centre switches). We would like to have an interconnect (obviously) , an external IP and an internal IP. Would best practice be to: bond the remaining two interfaces and VLAN as appropriate to provide three virtual interfaces? run the interconnect on one interface and VLAN the external/internal interfaces? purchase a blade with more NICs as the above is a terrible idea? Another option? Please feel free to point out the blindingly obvious or to relevant documentation on support.oracle. I am specifically interested in supported configurations and best practices. Thanks!

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• Severe latency only on one machine and only when accessing intranet site

  - by Joe M.

  I have one desktop machine that is having consistently high latency only when trying to load a page from an intranet site. Using the Chrome Developer Tools, the site shows a "Waiting" time of 4-5 seconds each page load. Other machines have <50ms, and the problem machine loads regular internet sites with <1s latency, so the problem is only on one machine and only when accessing the intranet site. This is a small business and all the hosts are on 192.168.0.1/24 I would have suspected a connection issue with the problem machine but normal internet sites are not having latency. Then I would have looked at connection issues with the intranet web server but other machines are not having latency to it. What else can I look at to troubleshoot this?

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• Should I upgrade my LinkSys WRT54GL firmware?

  - by Reid

  I have a LinkSys WRT54GL v1.1 which currently has stock firmware version 4.30.7. I see that version 4.30.14 is available. The router works fine now, and the release notes look uninteresting except for one line in v4.30.9: "Resolves issue with Linux kernel vulnerability". I have remote management turned off. I'm aware of the 3rd-party firmwares but the stock firmware works fine for me at the moment, so I don't have an interest in those. Is the status quo fine or should I upgrade the firmware? (It's a bit of a pain since the config has to be saved and reloaded, and obviously any mucking with firmware is risky.)

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• Why doesn't Ubuntu show my wireless device after updating the kernel?

  - by Jigar Shah

  After an kernel update Ubuntu doesn't show my wireless device. How can I fix this? I checked the syslogs and it says the following: 2010-02-16 19:25:39,913 WARNING: /sys/module/wl/drivers does not exist, cannot rebind wl driver 2010-02-16 19:25:39,940 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted 2010-02-16 19:25:46,066 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted 2010-02-16 19:25:46,086 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted 2010-02-16 19:25:46,162 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted 2010-02-16 19:35:05,451 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted 2010-02-16 19:35:05,480 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted 2010-02-16 19:35:05,506 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted 2010-02-16 19:35:12,496 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted 2010-02-16 19:35:19,870 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted 2010-02-16 19:35:23,398 WARNING: modinfo for module wl failed: ERROR: modinfo: could not find module wl 2010-02-16 19:35:23,399 WARNING: /sys/module/wl/drivers does not exist, cannot rebind wl driver 2010-02-16 19:35:23,432 DEBUG: BroadcomWLHandler enabled(): kmod disabled, bcm43xx: blacklisted, b43: blacklisted, b43legacy: blacklisted

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• Public DNS Server fails on Windows Amazon EC2

  - by Adroidist

  I have started a new Windows server instance on Amazon EC2. The security group has the following rules: Ports Protocol Source 22 tcp 0.0.0.0/0 80 tcp 0.0.0.0/0 443 tcp 0.0.0.0/0 3389 tcp 0.0.0.0/0 53 udp 0.0.0.0/0 -1 icmp 0.0.0.0/0 I am able to ping the public DNS server of the machine and i can connect to it using Windows Remote Desktop connection. However, when i put in my web browser the public DNS server, it fails to connect. Morever, I used filezilla and putty (and in both I loaded the private key .pem) but i receive connection timed out. I disabled the firewall on both my pc and the instance (which I entered using Remote desktop connection). Can you please tell me what I am missing?

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• Linksys by Cisco EZXS55W EtherFast 10/100 5-Port Workgroup Switch

  - by studiohack

  I'm looking into buying a switch to expand the one ethernet port on one level. I'm considering "Linksys by Cisco EZXS55W EtherFast 10/100 5-Port Workgroup Switch" from Amazon, but I'm not sure what the 'Etherfast' and the 'Workgroup Switch' parts mean? Will it work like a regular switch, or is it different? Thanks!

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• Windows file sharing connects over WiFi instead of LAN

  - by zacaj

  I have a laptop and a desktop computer, and I need to sync lots of files to the laptop and back whenever I go on a trip, etc. I've got a LAN cable connected into an extra port on the desktop that I plug into the laptop so I can get gigabit file transfers instead of wireless G. They connect fine. If I do an FTP transfer, for instance, using the LAN IP addresses, it goes at ~40MB/s, as it should. However when I copy files using explorer and native windows file sharing it detects the other computer by name, not IP (eg \\DESKTOP-PC\ instead of \\192.168.0.100\) and always connects to it by its wireless IP address instead of the faster LAN address. Both computers are running Windows 7. I have tried editing the priorities of the adapters in Advanced Settings and putting the LAN adapters above the wifi ones, but this didn't have any effect

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• Is Winpcap able to capture all packets going through a Gigabit NIC without missing any packets?

  - by Patrick L

  I want to use Winpcap to capture all network packets going through a Gigabit NIC of a server. Assuming that I am able to utilize the network link up to 100%, the maximum network speed is 1000Mbps. If we exclude the TCP/IP headers, the maximum TCP data rate should be roughly 940Mbps. Let's say I send a 1GB file through the NIC at 940Mbps using TCP destination port 6000. I use Winpcap to capture all network packets going through the NIC and then dump it to a pcap file. If I use Wireshark to analyze the pcap file and then check the sum of packet size for all network packets sent to TCP port 6000, am I able to get exactly 1GB from the pcap file? Thanks.

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• Encrypted WiFi with no password?

  - by Ian Boyd

  Is there any standard that allows a WiFi connection to be encrypted, but not require a password? i know that (old, weak) WEP, and newer WPA/WPA2 require a password (i.e. shared secret). Meanwhile my own wireless connections are "open", and therefore unencrypted. There is no technical reason why i can't have an encrypted link that doesn't require the user to enter any password. Such technology exists today (see public key encryption and HTTPS). But does such a standard exist for WiFi? Note: i only want to protect communications, not limit internet access. i get the sense that no such standard exists (since i'm pretty capable with Google), but i'd like it confirmed. Claraification: i want to protect communcations, not limit internet access. That means users are not required to have a password (or its moral equivalent). This means users are not required: to know a password to know a passphrase to enter a CAPTCHA to draw a secret to have a key fob to know a PIN to use a pre-shared key have a pre-shared file to possess a certificate In other words: it has the same accessibility as before, but is now encrypted.

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