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  • Can a malicious hacker share Linux distributions which trust bad root certificates?

    - by iamrohitbanga
    Suppose a hacker launches a new Linux distro with firefox provided with it. Now a browser contains the certificates of the root certification authorities of PKI. Because firefox is a free browser anyone can package it with fake root certificates. Thus a fake root certificate would contain a the certification authority that is not actually certified. Can this be used to authenticate some websites. How? Many existing linux distros are mirrored by people. They can easily package software containing certificates that can lead to such attacks. Is the above possible? Has such an attack taken place before?

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  • Updated Win XP to 7: network adapter driver problem

    - by jiri
    I updated Windows XP on my old laptop to Windows 7. After installing I tried to open internet connection but Win 7 says that it cannot find network adapter because of a missing driver. I tried to find network adapter from device manager but could not find one. My network connection was working fine on Win XP. What has happened, how to update my network adapter driver for Windows 7?

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  • how to broadcast a PXE server like Trinity Rescue Kit

    - by Larry G. Wapnitsky
    I would like to set up a portable PXE server for diagnostic purposes. The issue is that I won't always have access to the DHCP server, or the router itself (sometimes a home router) doesn't have an easily accessible place to set the servername/file for broadcast. I know that Trinity Rescue Kit is able to broadcast its PXE server without its own DHCP server. Can anyone point me in the direction to set this up on my own (without Trinity)? Thanks.

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  • need for tcp fine-tuning on heavily used proxy server

    - by Vijay Gharge
    Hi all, I am using squid like Internet proxy server on RHEL 4 update 6 & 8 with quite heavy load i.e. 8k established connections during peak hour. Without depending much on application provider's expertise I want to achieve maximum o/p from linux. W.r.t. that I have certain questions as following: How to find out if there is scope for further tcp fine-tuning (without exhausting available resources) as the benchmark values given by vendor looks poor! Is there any parameter value that is available from OS / network stack that will show me the results. If at all there is scope, how shall I identify & configure OS tcp stack parameters i.e. using sysctl or any specific parameter Post tuning how shall I clearly measure performance enhancement / degradation ?

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  • how can I reconnect DSL in cisco router 877w

    - by Sulaiman
    Hi All, I've configured ADSL and added a new public LAN ips for the router. How can I reconnect DSL connection and apply the new configuration without executing the command reload this is the commands I am using for DSL configuration config terminal interface dialer 0 ppp chap hostname User ppp chap password 0 Pass exit exit wr mem and this is the commands I am using for adding IP addresses: configure t interface vlan 1 ip address xx.xx.xx.xx 255.255.255.252 Secondary exit wr mem thank you

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  • Ping from specific network adapter on Windows

    - by Dean
    Hey, I've been troubleshooting network issues on servers with 2 NICs and laptops with wired and wireless cards. How can I force the PING and TELNET to be sent from a specific adapter? I know it's a trouble with windows. Turning off one of the adapters is not an option, I am always connected through one of the adapters. There must be some command line option to prefer one adapter over the other. Thanks

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  • Suddenly blocked from a site

    - by Diego Romero
    Suddenly from a time to now I haven't been able to go to a site I used to go frequently for maintenance (Wordpress). I tried different browsers, restarting my laptop, clearing cache, history, cookies. Also did a ping to the site ip, go 4 packets send and 4 lost. This is a problem I think with only my laptop, since I've been able to go into the site from other devices in the same network. I have also tried connecting to the same site from a completely different network with the same problem. I really don't know what to do about this, any advices? PS: site hosted in wp engine if that has anything to do with this problem.

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  • I've inherited a rat's nest of cabling. What now?

    - by hydroparadise
    You know, you see pictures like below and sort of chuckle until you actually have to deal with it. I have just inherited something that looks like the picture below. The culture of the organization does not tolerate down time very well, yet I have been tasked to 'clean it up'. The network functions as it is, and there doesn't seem to be rush to get it done, but I will have to tackle the bear at some point. I get the ugly eye when I mention anything about weekends. So my question goes, is there sort of a structured approach to this problem? My Ideas thus far: Label, Label, Label Make up my patch cables of desired length ahead of time Do each subnet at a time (appears that each subnet are for different physical locations) Replace one cable at a time for each subnet It's easier to get forgiveness than permision?

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  • External routing for local interfaces in a virtualized network

    - by Arkaitz Jimenez
    Current setup: br0| |-- tun10 -pipe-tun0(192.240.240.1) |-- tun11 -pipe-tun1(192.240.240.2) |-- tun12 -pipe-tun2(192.240.240.3) The pipe program is a custom program that forwards data back2back between two tun interfaces. The idea is puting 2 programs in .2 and .3 while keeping .1 as the local interface in the current machine. The main problem is that I want to route packets to .2 and to .3 through .1 and br0, but as they are local interfaces, the kernel ignores any routing instruction, it just delivers the packet to the proper interface. Tried iptables, but the nat table doesn't even see ping packets to those ifaces. A "ping 192.240.240.2" delivers a icmp packet with source and dest .2 to tun1, ideally it should deliver a source .1 dest .2 at tun1 through tun0-br0-tun1 Any hint? Here the output of some commands: Output

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  • pptpd configuration

    - by Ian R.
    I would like a little help on configuring pptp so I can use my server as a vpn server since I have 10 ip's on it and I travel a lot so that would really help me and my partners. I managed to install everything needed but my vpn client fails to connect due to some reason that I cannot understand. I know there are 2 files in pptp that you're supposed to edit so I will post my 2 files here: /etc/ppp/pptpd-options name pptpd refuse-pap refuse-chap refuse-mschap require-mschap-v2 require-mppe-128 proxyarp nodefaultroute lock nobsdcomp /etc/pptpd.conf option /etc/ppp/pptpd-options logwtmp localip xx.158.177.231 remoteip xx.158.177.103,xx.158.177.116,xx.158.177.121,xx.158.177.124,xx.158.177.125,xx.158.177.131,xx.158.177.134,xx.158.177.139,xx.158.177.142,xx.158.177.145 interfaces file eth0 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.231 Bcast:xx.158.177.255 Mask:255.255.254.0 inet6 addr: xx80::216:3eff:fe51:31ba/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:56352 errors:0 dropped:0 overruns:0 frame:0 TX packets:3xx15 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:4884030 (4.8 MB) TX bytes:6780974 (6.7 MB) Interrupt:16 eth0:1 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.103 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:2 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.116 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:3 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.121 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:4 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.124 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:5 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.125 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:6 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.131 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:7 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.134 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:8 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.139 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:9 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.142 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:10 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.145 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:3 errors:0 dropped:0 overruns:0 frame:0 TX packets:3 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:286 (286.0 B) TX bytes:286 (286.0 B)

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  • apache2 slow responding (debian)

    - by baloo
    I'm running an apache2 2.2.9 webserver with modpython and mpm_worker_module. The current config for the mpm is ServerLimit 32 StartServers 10 MaxClients 800 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 0 The server has 1G of ram and a 100Mbit connection. Checking netstat -na | grep ESTABLISHED | wc -l gives me a number between 50 - 60. The load is about 1.0 Every pageload is also cached by memcached. I can't see why the server is so slow in responding to new connections, sometimes droping them completely? Also tried disabling iptables to make sure it's not because of a full state table or something like that. The only thing in dmesg is a lot of spam about "TCP: Treason uncloaked!"

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  • How does Windows Remote Desktop Connection Work?

    - by Devoted
    How does Windows Remote Desktop connection work? An IP address is used to connect to the computer but....how can that IP be accessed from anywhere? If, for example, the IP address is 128.10.10.10, there MUST be another 128.10.10.10 somewhere else in the world. How does Remote Desktop know which one to connect to? Thanks so much EDIT: Thank you! Answers cleared this up quite a bit. But if my remote desktop connection suddenly stopped working and I didn't change anything, how do I even start to diagnose what may be the problem? I can remote connect to it from a LAN computer though...

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  • Multiple threads stuck on Tomcat behind Apache mod_proxy

    - by Eddy
    we just took a break at butting our collective heads against this maddening problem we're having. Basically this brand new deployment of Tomcat 6.0.36 crawls down to a halt every couple minutes with many of the worker threads stuck as in the example snippet; only after a while the server gets "unstuck" for another couple minutes. The previous Tomcat works a charm though, but keeping it is not really an option... On netstat, we also see a lot of FIN_WAIT and FIN2_WAIT. "catalina-exec-25" daemon prio=10 tid=0x000000004f9d4000 nid=0x7459 runnable [0x0000000044567000] java.lang.Thread.State: RUNNABLE at java.net.SocketOutputStream.socketWrite0(Native Method) at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92) at java.net.SocketOutputStream.write(SocketOutputStream.java:136) at org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:756) at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:448) at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:363) at org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:780) at org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:118) at org.apache.coyote.http11.InternalOutputBuffer.doWrite(InternalOutputBuffer.java:593) at org.apache.coyote.Response.doWrite(Response.java:560) at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:364) at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:448) at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:318) at org.apache.catalina.connector.OutputBuffer.close(OutputBuffer.java:274) at org.apache.catalina.connector.Response.finishResponse(Response.java:493) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:317) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:396) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) Any idea? Eddy

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  • routing wiredness - traceroute 'vanishes' en route

    - by The Journeyman geek
    I'm attempting to set up one of my boxes as a server (again), but i'm having some odd connection issues- the box itself connects fine to the internet, but trying to connect to my external ip address seems to result in the trace getting 'lost' partway. http://pastebin.com/HCQAGbvn - this is a traceroute from another system that's connected to another ISP - starhub is my own one, while i have another system that i have access to on singtel. I'm wondering if my ISP is messing around with routing, or is something very odd going on. As you note, the traceroute dosen't reach me, but if it helps, i use a dd-wrt router.

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  • Is it possible to provide a wired ethernet connection to external devices with an extra LAN card?

    - by Ben McCormack
    I'm trying to provide a wired ethernet connection (wireless is not an option for this device) to a device (Samsung blu-ray player) without running Cat5 cable all over the home. I have a PC sitting next to this device and the PC is connected to the network via a wireless USB adapter. Is it possible to provide a wired connection from the PC to the wired device using the (currently unused) ethernet port in the back of the computer? Here's how I envision the device getting connected to the internet via my network: Linksys WRT54G v8 Wireless Router | ``--> Windows 7 PC connected via wireless | ``--> Blu-ray player connected via wired connection to the ethernet port on the PC. If so, how is this done? Will I need a crossover cable? What settings will I need to change in Windows 7 so that the device can connect? NOTE: I'm trying to avoid having to buy a wireless bridge and/or hacking a router with an open-source firmware to get this to work. See my previous question for more details.

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  • How to setup a Wi-Fi 2-computer network with Internet sharing?

    - by Narek
    I have the following devices: Desktop Computer (Windows XP Professional) Laptop Computer (Windows Vista Home Premium) A USB modem that I want to connect to my Desktop computer (so my Desktop has Internet) And a Wi-Fi router (D-Link, model: DIR-300) that I want to use in order to create a connection between mentioned two computers to be able to share files and what is the most important thing to make my laptop to have access to the Internet. What steps I should do to have this system?

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  • Windows 7, network shares, and authentication via local group instead of local user

    - by Donovan
    I have been doing some troubleshooting of my home network lately and have come to an odd conclusion that I was hoping to get some clarification on. I'm used to managing share permissions in a domain environment via groups instead of individual user accounts. I have a box at home running windows 7 ultimate and I decided to share some directories on that machine. I set it up to disallow guest access and require specifically granted permissions. (password moe?). Anyway, after a whole bunch of time i figured out that even though the shares I created were allowed via a local group i could not access them until i gave specific allowance to the intended user. I just didn't think i would have to do that. So here is the breakdown. Network is windows workgroup, not homegroup or nt domain PC_1 - win 7 ultimate - sharing in classic mode - user BOB - groups Admins PC_2 - win 7 starter - client - user BOB - groups admins PC_3 - win xp pro - client - user BOB - groups admins the share on PC_1 granted permission to only the local group administrators. local user BOB on PC_1 was a member of administrators. Both PC_2 and PC_3 could not browse the intended share on PC_1 because they were denied access. Also, no challenge was presented. They were simply denied. After adding BOB specifically to the intended share everything works just fine. Remember, its not an nt domain just a workgroup. But still, shouldn't i be able to manage share permissions via groups instead of individual user accounts? D.

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  • Downstream to server periodically dropping and spiking

    - by dauphic
    I have a server located in Canada. I'm experiencing that, when connecting from the south-eastern US (southern California, Arizona), I see my downstream on connections to this server periodically drop to 0 for 1-3 seconds, then spike in the next second and receive all of the data that should have been received during the drop off period. This doesn't happen in regular intervals, but it does happen often, usually once every 5-10 seconds. I've gotten trace routes from users with various ISPs and locations, but I'm not seeing any spikes or drop offs in response times, or any sort of packet loss. I'm guessing this is because ICMP is prioritized, though. It seems like a misbehaving router along the way, but I have no idea how to figure out where the problem lies (let alone if there's any way to work around it). Is there any way for me to diagnose this problem?

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  • Wireless Network Connection gets dropped at times under Windows 7

    - by n179911
    I have running Windows 7 on my hp laptop with 802.11n wifi adapter. Some times, I lost wireless internet connection. Under the 'Wireless Connection' when I click the notification area, it said 'my home network is 'connected'... But in the header 'currently Connected to' it said 'no internet access' instead of 'internet access' I can 'fix' my problem by going to the 'wireless connection' my home network, click 'disconnect' and then click 'connect'. And when it comes back up, it gets connected again. any idea how can i fix this problem? Thank you.

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  • wget hangs in http request sent awaiting response in some sites

    - by gkr
    Using Ubuntu 12.04. wget hangs in http request sent, awaiting response... in some sites. Browser's are not opening sites that are failed in wget. But in WinXP everything works. This works gkr@gkr-desktop:~/Documents/curl$ wget google.com --2012-06-12 21:29:37-- http://google.com/ Resolving google.com (google.com)... 74.125.236.174, 74.125.236.160, 74.125.236.161, ... Connecting to google.com (google.com)|74.125.236.174|:80... connected. HTTP request sent, awaiting response... 301 Moved Permanently Location: http://www.google.com/ [following] --2012-06-12 21:29:38-- http://www.google.com/ Resolving www.google.com (www.google.com)... 74.125.236.179, 74.125.236.180, 74.125.236.176, ... Connecting to www.google.com (www.google.com)|74.125.236.179|:80... connected. HTTP request sent, awaiting response... 302 Found Location: http://www.google.co.in/ [following] --2012-06-12 21:29:38-- http://www.google.co.in/ Resolving www.google.co.in (www.google.co.in)... 74.125.236.184, 74.125.236.191, 74.125.236.183, ... Connecting to www.google.co.in (www.google.co.in)|74.125.236.184|:80... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [text/html] Saving to: `index.html.3' [ ] 13,383 --.-K/s in 0.04s 2012-06-12 21:29:39 (308 KB/s) - `index.html.3' saved [13383] gkr@gkr-desktop:~/Documents/curl$ This site just stops/hangs in awaiting response. gkr@gkr-desktop:~/Documents/curl$ wget grooveshark.com --2012-06-12 21:27:29-- http://grooveshark.com/ Resolving grooveshark.com (grooveshark.com)... 8.20.213.76 Connecting to grooveshark.com (grooveshark.com)|8.20.213.76|:80... connected. HTTP request sent, awaiting response... ^C gkr@gkr-desktop:~/Documents/curl$ Thanks

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  • How to run a DHCP service on Windows 7 Home

    - by Joshua Lim
    I'm trying to setup a DHCP server on Windows 7 Home, tried using a couple of freeware which I found on the Internet but none seemed to work. What I did: On the Windows 7 machine which I install the DHCP Server with the range 192.168.1.12-192.168.1.256. I set the Gigabit Ethernet adapter to a static IP address of 192.168.1.11 and subnet mask of 255.255.255.0. When I did an IP config, it showed. Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet Physical Address. . . . . . . . . : 8C-73-6E-75-A7-56 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::196d:b6bb:8f93:2555%12(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.1.11(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1 fec0:0:0:ffff::2%1 fec0:0:0:ffff::3%1 NetBIOS over Tcpip. . . . . . . . : Enabled I connected another Window 7 machine to the "DHCP server" using a cross cable and set network adapter on that machine to automatically detect IP address. The client fails to acquire the correct IP address from the DHCP server and showed the autoconfigured IPv4 address instead. Here's the information returned by config /all on the client machine. Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Atheros AR8152/8158 PCI-E Fast Ethernet Controller (NDIS 6.20) Physical Address. . . . . . . . . : 54-04-A6-40-96-4B DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::4885:4082:5572:5a85%12(Preferred) Autoconfiguration IPv4 Address. . : 169.254.90.133(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : DHCPv6 IAID . . . . . . . . . . . : 341050534 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-54-78-12-00-08-CA-46-4C-5A DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1 fec0:0:0:ffff::2%1 fec0:0:0:ffff::3%1 NetBIOS over Tcpip. . . . . . . . : Enabled DHCP client are running on both machines. I've tried many times but failed. Googling also returned no useful information for my scenario. Have I missed out any step? Thanks.

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  • Network Diagramming software options?

    - by Zak
    I've used The Dude to map my network, but I can only export the network map as a graphics file. I've also used Dia and Vision to manually diagram portions of my network. Does anyone out there have a solution where I can do automatic network mapping using a tool like "The Dude", then pull that file over to a manually editable format for cleaning up and/or enhancing in Visio or Dia?

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  • How to bypass vpn talking to VMWare Guest?

    - by marc esher
    Greetings. Network/VPN n00b question here. I'm running VMWare Workstation with a Guest Windows 2003 Server. It has SQL Server 2000 installed. The sole purpose for this Guest is to house SQL Server... it needn't have internet access or access to any other resources on the network other than the host. When launch Check Point VPN software, the host routes through the company network before it connects to the guest ... i.e. it's no longer a direct connection. I assume this is just how things are supposed to work. However, what's happening is that the connection between my host and the SQL Server instance on the guest intermittently drops. It's not consistent, and some databases on the server will be responsive while others aren't. It appears that the databases with the most traffic on the guest (the ones I'm hitting with load tests) are the ones that become intermittently unresponsive. This problem only manifests when VPN is on; when it's off, I can pound away on this database with no troubles. Thanks for any advice!

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