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  • Finding Missing UDP Frames Using Wireshark + Custom Dissector (for CQS)

    - by John Dibling
    How do you use Wireshark to identify missing UDP frames? I have written a custom dissector for the CQS feed (reference page). One of our servers gaps when receiving this feed. According to Wireshark, some UDP frames are never received. I know that the frames were sent because all of our other servers are gap-free. A CQS frame consists of multiple messages, each having its own sequence number. My custom dissector provides the following data to Wireshark: cqs.frame_gaps - the number of gaps within a UDP frame (always zero) cqs.frame_first_seq - the first sequence number in a UDP frame cqs.frame_expected_seq - the first sequence number expected in the next UDP frame cqs.frame_msg_count - the number of messages in this UDP frame And I am displaying each of these values in custom columns, as shown in this screenshot: A typical CQS log will consist of millions of rows, so I can't just eyeball it. Is there any way I can get Wireshark to tell me which frames are missing?

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  • setting up my own name server

    - by mmokh
    I'm in the process of setting up my own name servers using BIND9, however I want to visualize the name server setup in relation to registrars and other name servers. Say I have a domain www.mydomain.com I setup my 2 name servers: ns1.mydomain.com - 192.168.0.1 ns2.mydomain.com - 192.168.0.2 1) How does the world know that my name servers are now at ns1.mydomain and ns2.mydomain. I read about setting up glue records at my registrar. Could you please elaborate on this, i.e. once i setup these glue records, can I now use my name servers in NS records for any other domain? For e.g. NS records for www.otherdomain.com - ns1.mydomain.com/ns2.mydomain.com 2) Given I setup the glue records as mentioned above, do I "have to" update mydomain.com NS records to point to my name servers? Can I keep mydomain.com NS records pointing to my registrars name servers, however use ns1.mydomain.com/ns2.mydomain.com as name servers for any other domain I own? Thanks

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  • Intel PRO/1000 Server NIC on Windows latency. How to measure?

    - by Bobb
    Please note - this question is about latency of the card itself. Not latency of internet or anything else. Thank you for your attention on this matter. It is often said that good server NIC does make difference compared to low grade cards and on-board Ethernet chips. I understand that on-board chip will likely consume CPU time and stand-alone card would use its own chip. Also server card would be faster than low-grade card. Are these 2 facts explaining most of the server cards advantages over on-board and low-grade cards ethernet? How would you measure latency on the card itself? I saw some reports stating some microseconds figures of NIC latency but I dont see how to measure that... Any advise will be appreciated.

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  • Access points fighting for dominance?

    - by Phillip Oldham
    We have a small office with a large number of wireless devices (a mixture of desktop machines, laptops, and wifi-enabled phones) all working from a single Apple Airport Extreme which extends our wired network. I've added another Airport Extreme for resiliency, since we've been seeing a decrease in performance and (as far as I understand) access points can only handle a small number of clients. I set the new AP to extend the current network so that the clients weren't constantly switching between different wireless networks, however as soon as this AP was configured all the wireless devices started seeing network trouble, flicking on and off. I'm assuming that this is because both APs are reasonably strong, and the client can't decide which to use. What is the best route to follow to resolve this? What I'm aiming for is wireless resiliency; preferably having two APs share the network load, or if this isn't an option then having a primary AP with a "fail-over", should the primary go down for any reason.

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  • TCP stops sending weirdly.

    - by Utoah
    In case to find out the cause of TCP retransmits on my Linux (RHEL, kernel 2.6.18) servers connecting to the same switch. I had a client-server pair send "Hello" to each other every 200us and captured the packets with tcpdump on the client machine. The command I used to mimic client and server are: while [ 0 ]; do echo "Hello"; usleep 200; done | nc server 18510 while [ 0 ]; do echo "Hello"; usleep 200; done | nc -l 18510 When the server machine was busy serving some other requests, the client suffered from abrupt retransmits occasionally. But the output of tcpdump seemed irrational. 16:04:58.898970 IP server.18510 > client.34533: P 4531:4537(6) ack 3204 win 123 <nop,nop,timestamp 1923778643 3452833828> 16:04:58.901797 IP client.34533 > server.18510: P 3204:3210(6) ack 4537 win 33 <nop,nop,timestamp 3452833831 1923778643> 16:04:58.901855 IP server.18510 > client.34533: P 4537:4549(12) ack 3210 win 123 <nop,nop,timestamp 1923778646 3452833831> 16:04:58.903871 IP client.34533 > server.18510: P 3210:3216(6) ack 4549 win 33 <nop,nop,timestamp 3452833833 1923778646> 16:04:58.903950 IP server.18510 > client.34533: P 4549:4555(6) ack 3216 win 123 <nop,nop,timestamp 1923778648 3452833833> 16:04:58.905796 IP client.34533 > server.18510: P 3216:3222(6) ack 4555 win 33 <nop,nop,timestamp 3452833835 1923778648> 16:04:58.905860 IP server.18510 > client.34533: P 4555:4561(6) ack 3222 win 123 <nop,nop,timestamp 1923778650 3452833835> 16:04:58.908903 IP client.34533 > server.18510: P 3222:3228(6) ack 4561 win 33 <nop,nop,timestamp 3452833838 1923778650> 16:04:58.908966 IP server.18510 > client.34533: P 4561:4567(6) ack 3228 win 123 <nop,nop,timestamp 1923778653 3452833838> 16:04:58.911855 IP client.34533 > server.18510: P 3228:3234(6) ack 4567 win 33 <nop,nop,timestamp 3452833841 1923778653> 16:04:59.112573 IP client.34533 > server.18510: P 3228:3234(6) ack 4567 win 33 <nop,nop,timestamp 3452834042 1923778653> 16:04:59.112648 IP server.18510 > client.34533: P 4567:5161(594) ack 3234 win 123 <nop,nop,timestamp 1923778857 3452834042> 16:04:59.112659 IP client.34533 > server.18510: P 3234:3672(438) ack 5161 win 35 <nop,nop,timestamp 3452834042 1923778857> 16:04:59.114427 IP server.18510 > client.34533: P 5161:5167(6) ack 3672 win 126 <nop,nop,timestamp 1923778858 3452834042> 16:04:59.114439 IP client.34533 > server.18510: P 3672:3678(6) ack 5167 win 35 <nop,nop,timestamp 3452834044 1923778858> 16:04:59.116435 IP server.18510 > client.34533: P 5167:5173(6) ack 3678 win 126 <nop,nop,timestamp 1923778860 3452834044> 16:04:59.116444 IP client.34533 > server.18510: P 3678:3684(6) ack 5173 win 35 <nop,nop,timestamp 3452834046 1923778860> Packet 3228:3234(6) from client was retransmitted due to ack timeout. What I could not understand was that the client machine did not send out any packets after the first 3228:3234(6) packets was sent. The server machine had advertised a window (scaled) large enough. The data transfer up to the retransmit was fine which meant no slow start should be in action. What can cause the client machine to stop sending until the packet timed out? BTW, I am unable to run tcpdump on the server machine.

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  • PowerConnect 3548p SNTP and web interface not working

    - by Force Flow
    I have been unable to get SNTP and access to the web interface working properly on a Dell PowerConnect 3548p. In the logs, this message appears over and over again: 04-Jan-2000 20:19:29 :%MNGINF-W-ACL: Management ACL drop packet received on interface Vlan 172 from 172.17.0.3 to 172.18.0.10 protocol 17 service Snmp 172 is the management vlan. 172.17.0.3 is the DNS server 172.18.0.10 is the switch's IP address. The DNS server and the switch are located on different subnets and separated by routers. I am unable to access the web interface of the switch from the 172.17.x.x subnet. I can only access the web interface of the switch if I am accessing it from the 172.18.x.x subnet. There is also a managed linksys switch on the 172.18.x.x subnet on the 172 vlan, which has no problem with SNTP. I can also access it from the 172.17.x.x network. So, it stands to reason that this is not a firewall or routing issue, but with the 3548p switch. I suspect the issue is with management permissions/ACLs on the 3348p switch, but that's about as much as I've been able to determine so far. Any ideas?

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  • TCP video streaming: TCP throughput(rate) and RTT

    - by misteryes
    we know that a rough estimation of TCP rate is: WINDOW/RTT, where WINDOW is the min(CWIN, RWIN), CWIN is the congestion window size of the sender, while RWIN is the receiving window. nowadays, the encoding rate of videos may be 1000KB/s(8000kbit/s), if RTT is 500ms, it needs the window size to be 2000KB. But we know that usually the receiving window size is below 64KB, there is a big gap. so if RTT is too large, TCP streaming is not possible? Is my understanding right? thanks!

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  • WiFi signal is lost every 3 minutes

    - by Software Monkey
    For several weeks now my Android phone has been losing it's WiFi signal momentarily, typically at about 3 minute intervals (about 3 minutes, 1.5 seconds) and occasionally at some longer interval that always seems to be just over 3 minutes. This causes an interruption of several seconds while the WiFi connection is re-established and typically fails any kind of download/streaming that is happening, makes web sites "unreachable" and generally makes the phone unusable as a data device due to the frequency. The signal remains down for about a second, but the phone takes a few more seconds to reconnect to the router. This happens regardless of proximity to the router, which otherwise show a very strong signal - usually -40 to -30 dBm or better in the same room, nowhere less than 060 dBm anywhere in the house. Changing channels does not help (I've tried 1, 4, 8 and 9). Nor does turning off the router's guest access. Nor does turning off the 5.0 GHz band. Monitoring the signal on my phone with WiFi analyzer, shows all WiFi signals on all channels drop to nothing when the WiFi connection is lost (there are two other networks on different channels which are strong enough to be relevant, with about 6 others constantly fading in and out). WiFi analyzer shows 3 separate signals for my router, the main 2.4 GHz, the guest 2.4 GHz and the 5.0 GHz. Using WiFi Analyzer on my wife's phone side-by-side shows no change in signal when my phone drops, nor does her phone drop. Monitoring the signal using our laptop, side-by-side likewise shows no signal loss and likewise the laptop does not lose it's WiFi connection. But, at work, the phone seems to not exhibit the same behavior, or, if it does, it's very occasional. Monitoring it all day at work I only saw the signal drop 3 or 4 times. The signal strength of the various networks there is comparatively weak. AT&T were super helpful: "Sorry, we can't help you with WiFi problems. You could try doing a factory reset on your phone". </sarcasm The router is relatively new, but has been working fine with this phone since last Dec. Phone : Motorola Atrix (about 8 months old). Router : Belkin N750 DB (F9K1103 v1 (01C)). Router Firmware: 1.00.46 (2011/10/28 6:37:11). Security : WPA/WPA2-Personal (PSK)

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  • Routing and Remote Access Port Mapping not applied to localhost

    - by Computer Guru
    Hi, I've set up Routing and Remote Access (Windows Server 2003) to forward publicip:80 to a server on the private internal network, and that's working great. Incoming requests from the internet to port 80 are correctly forwarded to our internal web server and everything is fine. However, requests on the server itself are not being forwarded. That is, if I open a console window and type "telnet publicip 80" from the server on publicip, the request is not forwarded to the private server. I understand that in RRAS I've mapped port 80 on the public interface to the private server and that's why it's not working; but I don't know how to configure it so that requests from the local PC are also forwarded to the private server. I'd appreciate any help or feedback on the matter. Thanks!

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  • to measure throughput of testing device connect to server via AP

    - by samantha
    Description of project- I have a test tool to which DUT connects. The test tool has an access point in it and once DUT get connected to it via mac address we check RSSI and some other features of WiFi of DUT. Now I am wondering is there is any way I can measure throughput of Device under test via mac address of DUT from server side. Test-tool has LINUX fedora 11 in it and major coding is done in c/C++ and json command. Previously, I have tried to install ftp server on test-tool and DUT can connect to it and we can measure the throughput or data transfer rate, but this is not feasible solution as it requires lot of intervention from DUT. What I am interested in is 1) To run some script on server side /test tool and it gives me throughput of bandwidth of connected device may be via mac address of DUT OR 2) Server script transfer some files/packets to DUT and we can measure the throughput. Coding is not a major challenge at this stage , I just need some tool which requires minimum intervention from DUT.

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  • Open ports for Apache Tomcat-7.0.32 on Linux Mandriva

    - by ivanov-void
    I installed Apache Tomcat-7.0.32 on Linux Mandriva and I want to make it accessible. for this I need to open ports in iptables. I added the following rules- iptables -A INPUT -p tcp -m tcp --dport 8081 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8010 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8444 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8006 --syn -j ACCEPT then save and restart iptables - /etc/init.d/iptables save /etc/init.d/iptables restart verify, that ports is open - netstat -tulpn | less I am running command - netstat-ntpl | grep java and see - When I disable the firewall, I see the start page of the server on request - http://server_ip:8081/ When enable - server not accessible from outside. In what may be the cause? I would be most grateful for the information! Thank you!

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  • Dell Latitude E6400 power button and wireless not working or only working intermittently

    - by Droid
    The power button on the laptop stopped working randomly as of a day or two ago. I can only power the laptop on if its attached to a docking station, on which I can use the power button to turn on/off the laptop. Today the wireless card stopped working (the wifi light does not turn on, even after I turn on the wireless switch). What is the problem and how can I fix it? The laptop is about 1 year old. I have not dropped it, but do carry it around a good amount, including docking it/undocking it frequently.

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  • IRC server connecting to another server

    - by Oxinabox
    I'm setting up an IRC server using IRC-Hybrid, I want my server to connect to another server, so that people on my server can connect to channels on that other server. I know this can be done, the GIMP IRC, is the same as the GNOME IRC My ircd.conf contains the following: connect { name = "aabstractname"; host = "128.64.2.1; send_password = "somepass"; accept_password = "somepass"; encrypted = no; port = 6667; class = "server"; autoconn = yes; compressed = yes; fakename = "irc.sd.dom.asn.au"; }; So when i run: /etc/init.d/ircd-hybrid restart it should be connecting to 128.64.2.1, but the log on 128.64.2.1, doesn't show anything Do I need entry on the host 128.64.2.1? I can't find any documentation for ircd.conf I'ld really like that documentation so I can check all my settings are right.

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  • Ubuntu 9.04 Cannot Connect to visible open wifi ap (reason 6)

    - by Andrew Bolster
    I'm travelling currently so the last network i connected successfully to was my home wpa-psk network. I hadn't tried anything until i got to my accommodation that is an open network (that I'm on now on the Win7 partition on my laptop). The network (and a similar archetypical 'linksys' open network, aswell as some protected local networks are correctly displayed in network-manager and upon selection, it happily spins around to its hearts content for a while before saying 'no chance boy'. /var/log/syslog spills out the usual combination of wpa_supplicant and kernel messages, the most interesting of are that the kernel deauthentication reason 6 response. 6 apparently means class2FrameFromNonAuthStation...Client attempted to transfer data before it was authenticated. Anyone seen anything like this? I've already tried going closer to the router to no avail. I don't remember seeing this any other time I've connected to a open AP, even if that AP is far away. (Signal strength for this AP is good, kismet says its around -57dBm, well above the threshold of -80dBm, and I've tried all the suggestions from the 'Related Questions'

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  • How to make routes on a windows 7 laptop persistent?

    - by askvictor
    I have a number of (windows 7) laptops that normally connect via wireless. We also have a wired network for special purposes. When one of these laptops plugs in to the wired network, at the moment, it makes the wired network the default route. Instead, I would like it to keep the wireless network the default, and route only 10...* through the wired. I can achieve this with: route delete 0.0.0.0 IF 22 route add 10.0.0.0 ... IF 22 (where IF 22 is the wired network interface). But how can I get this to stick? Currently, if the wired network is unplugged then re-plugged, it grabs the default route again. So I want a way of making the wireless network not get the default route, and to make the 10...* network persistent. Is there a hook to run commands after a network connection is established in windows? In linux I would use post-up hooks.

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  • How do I get detailed information about what happens during logon

    - by Funky Si
    Due to my IT department leaving I am now responsible for all our IT systems. I now have several problems to get my head around and fix. I run Active Directory on windows server 2003 and use group policy to apply settings etc. Recently we have had some windows 7 clients added to our network, these are having awful problems with our logon scripts and drive mappings. For the most part my XP clients are working without a problem. What I want to know is what is going on during logon, as running the logon scripts after I have logged on often works. Does anyone know of a way to get detailed log information of what is happening before and during logon. Thanks for your help and any suggestions you have for tracking down the source of these problems.

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  • How to tune TCP TIME_WAIT timeout on Solaris?

    - by Hongli Lai
    I'm trying to change the TCP TIME_WAIT timeout on Solaris. According to some Google results I need to run this command: ndd -set /dev/tcp tcp_time_wait_interval 60000 However I get: operation failed: Not owner What am I doing wrong? I'm already running ndd as root. Is there another way to tune TIME_WAIT?

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  • How to place a virtual machine in DMZ?

    - by Giordano
    I have an Ubuntu 12.04 server running few virtual machines with KVM. I would like to expose some of these virtual machines on the internet, to make it possible for customers to test the products we're developing and make available other products for demo purposes. One of the server NICs is configured with a public IP. However before exposing anything on the web I would like to be sure that if one of the virtual machines get compromised, the attacker doesn't reach the rest of the hosts. What I would like to do is to put these virtual machines into a DMZ. These are the steps I'm planning to do: Create a tap interface in the virtualization host (let's say tap1) Create a bridge using tap1 and give it an IP in a subnet separate from the other hosts. Let's say 10.0.0.1 Attach the DMZ virtual machines to the bridge and configure their IP statically (10.0.0.2, 10.0.0.3, etc...) Using UFW, forbid any traffic from 10.0.0.0/24 to any of the internal hosts, allow the traffic from the internal hosts towards 10.0.0.0/24 and expose the virtual machines on the web using port forwarding. Do you think this setup is safe? Can you suggest any improvement or a better/safer approach? Thanks in advance!

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  • Dynamically blocking excessive HTTP bandwidth use?

    - by Jeff Atwood
    We were a little surprised to see this on our Cacti graphs for June 4 web traffic: We ran Log Parser on our IIS logs and it turns out this was a perfect storm of Yahoo and Google bots indexing us.. in that 3 hour period, we saw 287k hits from 3 different google ips, plus 104k from yahoo. Ouch? While we don't want to block Google or Yahoo, this has come up before. We have access to a Cisco PIX 515E, and we're thinking about putting that in front so we can dynamically deal with bandwidth offenders without touching our web servers directly. But is that the best solution? I'm wondering if there is any software or hardware that can help us identify and block excessive bandwidth use, ideally in real time? Perhaps some bit of hardware or open-source software we can put in front of our web servers? We are mostly a windows shop but we have some linux skills as well; we're also open to buying hardware if the PIX 515E isn't sufficient. What would you recommend?

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  • Netgear Router missing Wireless Configuration Menu Link

    - by ccisystems
    I have a Netgear WiFi router DG834G v3. On it it says it's a WiFi, ADSL 2+ modem, switch, etc. There is an antenna on the back and a WiFi indicator on the front. However, when I connect to it via the web interface, the wireless setup link is missing from the menu. The top label indicates it is a DG834 (without G). I have received it from a friend and was really looking forward to using it but I really need the WiFi part. I looked on Netgear's site as I thought someone must have uploaded the wrong firmware for the device sometime - so I upgraded to the latest firmware, but it still says it's NOT a 'G' device and the wireless menu is nowhere to be found. I'd appreciate a push in the right direction as to what I could do. Is it possible that the WiFi chip is broken or something and the device does not detect it and the firmware reverts the device to a different version?

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  • Windows XP does not list WPA wireless networks

    - by Tomalak
    What can be the reason that Windows XP does not show WPA-encrypted wireless networks? The laptop I have problems with is an older model (Toshiba Satellite Pro 6100) with Windows XP SP3 on it, fresh install. The wireless network card in it is an Agere product that lists as "Toshiba Wireless LAN Mini PCI Card". The networks showed up perfectly before I first tried to connect to one (it was set to WPA2). The connection failed (the card supports WPA only), then something must have happend and Windows hides these networks now. A manually configured WPA setup via Windows' own wizard works, I'm using it right now. The network just won't show up in the list of available network on its own. I suspect that XP incorrectly set a flag somewhere that this network card does not support WPA. Is there such a flag, and if so, how can I change it back?

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  • How to use Public IP in case of two ISP when two differs from each other

    - by user1471995
    Please bare with my long explanation but this is important to explain the actual problem. Please also pardon my knowledge with PFsense as i am new to this. I have single PFSense box with 3 Ethernet adapter. Before moving to configuration for these, i want to let you know i have two Ethernet based Internet Leased Line Connectivity let's call them ISP A and ISP B. Then last inetrface is LAN which is connected to network switch. Typical network diagram ISP A ----- PFSense ----> Switch ---- > Servers ISP B ----- ISP A (Initially Purchased) WAN IP:- 113.193.X.X /29 Gateway IP :- 113.193.X.A and other 4 usable public IP in same subnet(So the gateway for those IP are also same). ISP B (Recently Purchased) WAN IP:- 115.115.X.X /30 Gateway IP :- 115.115.X.B and other 5 usable public IP in different subnet(So the gateway for those IP is different), for example if 115.119.X.X2 is one of the IP from that list then the gateway for this IP is 115.119.X.X1. Configuration for 3 Interfaces Interface : WAN Network Port : nfe0 Type : Static IP Address : 113.193.X.X /29 Gateway : 113.193.X.A Interface : LAN Network Port : vr0 Type : Static IP Address : 192.168.1.1 /24 Gateway : None Interface : RELWAN Network Port : rl0 Type : Static IP Address : 115.115.X.X /30 (I am not sure of the subnet) Gateway : 115.115.X.B To use Public IP from ISP A i have done following steps a) Created Virtual IP using either ARP or IP Alias. b) Using Firewall: NAT: Port Forward i have created specific natting from one public IP to my internal Lan private IP for example :- WAN TCP/UDP * * 113.193.X.X1 53 (DNS) 192.168.1.5 53 (DNS) WAN TCP/UDP * * 113.193.X.X1 80 (HTTP) 192.168.1.5 80 (HTTP) WAN TCP * * 113.193.X.X2 80 (HTTP) 192.168.1.7 80 (HTTP) etc., c) Current state for Firewall: NAT: Outbound is Manual and whatever default rule are defined for the WAN those are only present. d) If this section in relevant then for Firewall: Rules at WAN tab then following default rule has been generated. * RFC 1918 networks * * * * * Block private networks * Reserved/not assigned by IANA * * * * * * To use Public IP from ISP B i have done following steps a) Created Virtual IP using either ARP or IP Alias. b) Using Firewall: NAT: Port Forward i have created specific natting from one public IP to my internal Lan private IP for example :- RELWAN TCP/UDP * * 115.119.116.X.X1 80 (HTTP) 192.168.1.11 80 (HTTP) c) Current state for Firewall: NAT: Outbound is Manual and whatever default rule are defined for the RELWAN those are only present. d) If this section in relevant then for Firewall: Rules at RELWAN tab then following default rule has been generated. * RFC 1918 networks * * * * * * Reserved/not assigned by IANA * * * * * * Last thing before my actual query is to make you aware that to have multiple Wan setup i have done following steps a) Under System: Gateways at Groups Tab i have created new group as following MultipleGateway WANGW, RELWAN Tier 2,Tier 1 Multiple Gateway Test b) Then Under Firewall: Rules at LAN tab i have created a rule for internal traffic as follows * LAN net * * * MultipleGateway none c) This setup works if unplug first ISP traffic start routing using ISP 2 and vice-versa. Now my main query and problem is i am not able to use public IP address allocated by ISP B, i have tried many small tweaks but not successful in anyone. The notable difference between the two ISP is a) In case of ISP A there Public usable IP address are on same subnet so the gateway used for the WAN ip is same for the other public IP address. b) In case of ISP B there public usable IP address are on different subnet so the obvious the gateway IP for them is different from WAN gateway's IP. Please let me know how to use ISP B public usable IP address, in future also i am going to rely for more IPs from ISP B only.

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