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  • How to troubleshoot slow powerconnect 62xx management interface

    - by Hannes
    Our Dell Powerconnect 62xx switches have a very high packetloss on the management interface. I presume this is caused by a new appliance which uses multicast for communication but I am not sure. Our network setup is following: servers a - Dell PC6248 | servers b - Dell PC6248 |- juniper core router servers c - Dell PC6248 | What we see is that the multicast traffic arrives at all servers (but only the servers b use the multicast) and I fear that this multicast traffic floods the switch management interface. The switches' management interfaces are reachable via vlan101, all other traffic is sent over other vlans. When I tcpdump on one of the 2 servers with a vlan 101 ip address, I only get a few arp requests but almost nothing. When I try to ping between these 2 servers, it works like a charm. I would like to know what a good way is to troubleshoot this problem and maybe help me understand what is going wrong on that subnet.

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  • What is the "in-the-wire" size of a ethernet frame? 1518 or 1542?

    - by chrisapotek
    According to the table here, it says that MTU = 1500 bytes and that the payload part is 1500 - 42 bytes or 1458 bytes (<- this is actually wrong!). Now on top of that you have to add IPv4 and UDP headers, which are 28 bytes (20 IP + 8 UDP). That leaves my maximum possible application message to as 1430 bytes! But by looking for this number in the Internet I see 1472 instead. Am I doing this calculation wrong here? All I want to find out is the maximum application message I can send over the wire without the risk of fragmentation. It is definitely not 1500 because that includes the frame headers. Can someone help? The confusion is the the PAYLOAD can actually be as large as 1500 bytes and that's the MTU. So now what is the size in-the-wire for a payload of 1500? From that table it can be as big as 1542 bytes. So the maximum app messages I can send is 1472 (1500 - 20 (ip) - 8 (udp)) for a maximum in the wire size of 1542. It amazes me how things can get so complicated when they are actually simple. And I have not clue how someone came up with the number 1518 if the table says 1542.

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  • 'Slow down' A DHCP server on purpose.

    - by Ced
    As the title implies, May look like a silly question, But what i'm trying to do, Is to have 2 DHCP servers in one network. One only leases IPs to Bootp clients (And if the client re-requests immediately after leases again) And one DHCP server, which is builtin with my PFsense router, that leases the non-bootp clients so they can access the internet and other network resources. I know by chance that PFsense uses ISC-DHCPd. Maybe they have a delay option? All i need to do to make sure the bootp/PXE boot clients get the proper address, is slow down the DHCP server in the PFsense box. Question is how. Anyone ideas? Thanks in advance

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  • What is causing my internet to be slow on one laptop but not the other and only at a distance?

    - by Matt Case
    I have a newer laptop, purchased within the last year (acer aspire 7740). This laptop does not have any problem connecting to wireless networks and indicates that the signal strength is excellent on most of the wireless networks I connect to. When the laptop is within 10 feet of my wireless router it gets 30 down 10 up. When it is farther away than 10 feet it will be lucky to get 3 down and 1 up. I also have an older laptop, purchased in 2005, that has no problems at all at the same range. None of my phones, gaming consoles or tablets have this problem. I am beginning to think that the problem must be some hardware defect with the wireless card. I can provide additional information if needed. Just thought I'd check to see what others thought because I've been working on computers my whole life and have never heard of this happening. I have also tried to change the channels on my wireless router and have had no success with this idea.

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  • Basic connectivity issues between Win 7 and XP mixed wired/wireless network.

    - by Pulse
    Setup: Windows 7 x64 Ultimate desktop hard wired to Asus WL500gp router (WL500gpv2-1.9.2.7-d-r1445 firmware) Several Bridged VirtualBox VM's running XP, 7, ubuntu server 10.04, Mint 9 and SuSE 11.2 Win XP Pro SP3 notebook with D-Link Airplus wireless network card. No firewall or other security software currently running on either platform (at least for the duration of the test) Situation: Router is acting DHCP server Clients are receiving correct addresses and additional parameters Internet connectivity is available from all clients Windows 7 sharing is set to Network type = work (not home group) NetBT is disabled on all clients using smb over TCP What I can do: I can ping the router and internet addresses from the wireless XP notebook I can ping the Win 7 desktop and any VM from the XP wireless notebook I can ping all devices from the router All VM's and 7 can ping each other and the router as well as Internet addresses What I can't do: I cannot ping the XP wireless notebook from either The Win 7 desktop or the VM's it alwats returns a destination host unreachable. Tracert resolves the name or the XP notebook but also returns a destination host unreachable. From the above it would seem that something is blocking connectivity in a single direction (from the Win 7 box to the Win XP notebook) only but the router can ping the XP notebook. Some fresh input would be most welcome, as this is beginning to drive me batty. Thanks

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  • Can connect to WAN via PC but router doesnt.

    - by user16877
    I have a very strange problem regarding the office network. We are currenltly in a executive suite and when i connect to wan via ethernet cable i get dhcp assigned IP address in my network config. I hooked up the linksys router to the wall expecting it to receive all the necessary ip info but that didnt work. So we have been assigned static ip address to put in to our router later but even with the static ip router doesnt seem to connect to internet. But using the same ip address and assigning to laptop works. I m very puzzled what might be the cause of this so any help is really appreciated.

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  • How do I get a 300Mbps connection over 802.11n?

    - by Daniel Schaffer
    I just bought a new wireless setup, consisting of a Cisco E2000 router, Edimax 7718un USB adapter for my laptop and an Edimax 7728in PCI adapter for my HTPC (which isn't in a location I can run cat5 to). I have to stay in the 2.4GHz band because I have an iPhone and a Wii that will need to connect. I'm aware that 11g devices will drop speeds for 11n devices, but they aren't connected yet. The fastest connection I've been able to get, with the router within 5 feet of either the laptop or HTPC is 144Mbps. The router has settings for "20MHz" and "Auto (20 MHz or 40Mhz) channel width, which I've set to the "Auto" setting. I haven't been able to find anything similar for either of the Edimax adapters. This is the first I've dealt with 11n, so I'm not even sure what else could be causing a problem. How do I get up to 300Mbps, or at least a fair bit closer?

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  • how to use iptables to block the IP of device connected to openwrt router

    - by scola
    I have two routers(A,B).the A connect to internet with IP:192.168.1.1 The openwrt router B connect the lan of A by bridge with static IP:192.168.1.111. I am learning to use iptables to control the devices connected to B(wlan) . I use my phone to connect wifi of B,the phone's IP is IP:192.168.1.100.it can surf the internet normally. I want to block the phone's IP to make the phone can not connect to internet. refer to http://bredsaal.dk/some-small-iptables-on-openwrt-tips iptables -A input_wan -s 192.168.1.100 --jump REJECT iptables -A forwarding_rule -d 192.168.1.100 --jump REJECT but it do not work.the phone still connect to internet normally. and I tried other chain(INPUT,OUTPUT,FORWARD).so many chains confused me. iptables -I OUTPUT -o br-lan -s 192.168.1.100 -j DROP and it do not work again. I'm sure that the iptables have no problem. root@OpenWrt:/etc# iptables -L|grep Chain Chain INPUT (policy ACCEPT) Chain FORWARD (policy DROP) Chain OUTPUT (policy ACCEPT) Chain forward (1 references) Chain forwarding_lan (1 references) Chain forwarding_rule (1 references) Chain forwarding_wan (1 references) Chain input (1 references) Chain input_lan (1 references) Chain input_rule (1 references) Chain input_wan (1 references) Chain output (1 references) root@OpenWrt:/etc# ifconfig br-lan Link encap:Ethernet HWaddr 0C:82:68:97:57:BA inet addr:192.168.1.111 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::e82:68ff:fe97:57ba/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:14976 errors:0 dropped:0 overruns:0 frame:0 TX packets:7656 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2851980 (2.7 MiB) TX bytes:1902785 (1.8 MiB) eth0 Link encap:Ethernet HWaddr 0C:82:68:97:57:BA UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:58201 errors:0 dropped:11 overruns:0 frame:0 TX packets:45012 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:54591348 (52.0 MiB) TX bytes:5711142 (5.4 MiB) Interrupt:4 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:312 errors:0 dropped:0 overruns:0 frame:0 TX packets:312 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:39961 (39.0 KiB) TX bytes:39961 (39.0 KiB) mon.wlan0 Link encap:UNSPEC HWaddr 0C-82-68-97-57-BA-00-48-00-00-00-00-00-00-00-00 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:4900 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:1223807 (1.1 MiB) TX bytes:0 (0.0 B) wlan0 Link encap:Ethernet HWaddr 0C:82:68:97:57:BA UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:37346 errors:0 dropped:0 overruns:0 frame:0 TX packets:49662 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:3808021 (3.6 MiB) TX bytes:54486310 (51.9 MiB) root@OpenWrt:/etc/config# cat network config 'interface' 'loopback' option 'ifname' 'lo' option 'proto' 'static' option 'ipaddr' '127.0.0.1' option 'netmask' '255.0.0.0' config 'interface' 'lan' option 'ifname' 'eth0' option 'type' 'bridge' option 'proto' 'static' option 'ipaddr' '192.168.1.111' option 'netmask' '255.255.255.0' option 'gateway' '192.168.1.1' option dns 192.168.1.1 and how to use iptables to control the network of wlan? Thanks in advance and sorry for poor English.

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  • Mount linux partition as Windows network share over internet

    - by CptEO
    I have a Linux server running RHEL 6. I have two Windows servers. All servers are connected directly to the web with an external IP, they are not in a local lan. What I would like to achieve is to setup the Linux server so that it offers a single share (the whole partition) that can be mounted as network drive within Windows. I don't want to use any 3rd party software to access the linux server because I want to use the linux server as a backup for Bare Metal Restore. In order to do so, I need to be able to access the linux partition from within the Windows Recovery Enviroment where I cannot install any 3rd party software. The linux server should only be accessible from given IP addresses (e.g. the 2 windows servers). Does anyone know if the setup I would like to have is possible?

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  • Log and debug/decrypt an windows application's HTTPS traffic

    - by cweiske
    I've got a proprietary windows-only application that uses HTTPS to speak with a (also proprietary, undocumented) web service. To ultimately be able to use the web service's functionality on my linux machines, I want to reverse-engineer the web service API by analyzing the requests sent by the application. Now the question: How can I decrypt and log the HTTPS traffic? I know of several solutions which don't apply in my case: Fiddler is a man-in-the-middle HTTPS proxy which I cannot use since the application doesn't support proxies. Also, I do not (yet) know if it works with self-signed server certificates, which I doubt. Wireshark is able to decrypt SSL streams if you have the server's private certificate, which I don't have. any browser extension since the application is not a browser If I remember correctly, there have been some trojans that capture online banking information by hooking into/replacing the window's crypto API. Since the machine is mine, low level changes are possible. Maybe there is a non-trojan (white-hat) network log application out there which does the same? There is a blackhat presentation with some details available to read. They refer to Microsoft Research Detour for easy API hooking.

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  • How can I control wireless networks in Ubuntu without Network-Manager?

    - by Solignis
    Hi there, I recently installed Ubuntu on a laptop I got. I was having issues with the network manager just like I was having in my VM where it was not setting up the hostname correctly. Anyhow now I have a problem, since it is a laptop it will be moving.... But I have no way to discover new wireless networks. Anyway I can gain that functionality back? The problem I am running into is that I need to set the DNS search and domain for the machine so I can access my network but the network-manager was overriding the settings. Any help would be much appreciated.

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  • Slow upload to Server 2008 DC, Downloads work as expected

    - by Anthony
    I have a Windows Server 2008 Domain Controller that I run as a do-it-all server. It has a GbE connection to the network and to every machine on the network. Downloads from the server file shares work as expected, between 70MB/s and 80MB/s to all the machines. However, when I try to copy files back up to the server, speeds fall to 7MB/s-10MB/s. I've disabled flow control and large send offload properties on all the NICs. I had this problem before and managed to fix it through some properties changes, but like an idiot, I never documented my fix and have since moved to a new server. Any ideas what I need to do to get the speeds to be more symmetric? EDIT: Remote differential compression is also disabled.

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  • DHCP Relay setup in ubuntu server

    - by jerichorivera
    I have a network appliance (QNO) that works as traffic load balancer and dhcp server. I would like to add a linux server in between the network appliance and the client computers. The linux server will be used to monitor bandwidth usage. My problem is I still want DHCP to be served by the network appliance so that load balancing will still work efficiently. We are afraid that if we setup the linux server as the DHCP server the network appliance will not be able to load balance the traffic if it only sees the linux server as a single client connecting to it. I've been searching all over for a tutorial on how to setup DHCP relay but have not found any. How do I setup DHCP relay on my linux server given there are two NICs attached to it, one connects the linux server to the network appliance and the other connects the linux server to the client computers. EDIT Router (DHCP) ---- [eth0] Linux Server (Relay agent) [eth1] ----- PC (network) Router IP is 192.168.0.100 eth0 is on DHCP eth1 is static 192.168.2.11 (if I need to change this I can) Tried to do dhcrelay -i eth1 192.168.0.100, but the PC was not getting any DHCP lease from the DHCP router. I might be missing something here.

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  • Is it safe to use a single switch for multiple subnets?

    - by George Bailey
    For a moment, forget about whether the following is typical or easy to explain, is it safe and sound? Internet | ISP supplied router x.x.x.1 (public subnet) | switch-------------------------------------+ | (public subnet) | (public subnet) BVI router (switch with an access list) NAT router | (public subnet) | (private subnet 192.168.50.1) +--------------------------------switch----+ (both subnets) | | computer with IP 192.168.50.2 ------+ +----computer with IP x.x.x.2 I don't plan to implement this setup, but I am curious about it. The 50.2 computer may send a packet to the x.2 computer, but it will use 50.1 as the router, since 50.2 knows that the subnet is different. Would this result in the packet being received twice by the x.2 machine, first directly through the switch, second by way of the two routers? Do you see any problems with this aside from how confusing it is, and that it would put one switch doing the work of two subnets?

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  • DD-WRT Router Can't hold a connection after initial setup...

    - by AC
    Struggeling with my new DDWRT router (Buffalo WZR-HP-G300NH) configuration. I configured it using one machine while comparing the settings on my existing Linksys WRT54GL on another machine. To the best of my knowledge, I've set it up the same way as my Linksys, but DDWRT has so many other options. After configuring it, I plugged it into the modem, VOIP device & my network. I see the phones come back online. However after a few minutes, it seems I lose the outbound connection (phones die and I can't get out over HTTP). What's confusing me is it works for a few minutes, then it fails. No idea what to look for. Ideas?

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  • Remote Desktop fails after VPN connection

    - by Samet Sorgut
    The local computer (comp 1) is connected to a remote computer (comp 2) with Remote Desktop. On the remote computer (comp 2), I try to establish an VPN connection to a different remote computer (comp 3). Once I try to establish the VPN connection from the remote computer (comp 2) to the second remote computer (comp 3), Remote Desktop freezes on comp 1. It is not possible to connect to comp 2 again via Remote Desktop. What can be done to connect to this remote computer (comp 2) after it establishes a VPN connection? The only thing that comes to my mind is to install a second NIC and configure Remote Desktop to accept connection from this NIC while VPN is working from the other... What do you suggest? EDIT: I want to use the internet connection of the VPN, so all traffic should go over the VPN but still RDP working. My IP: 100.0.0.1 The IP where I'm connecting via RDP: 200.0.0.20 (Mask: 255.255.255.192, Gateway: 200.0.0.193) Where the 200.0.0.1 connects to VPN the IP of the VPN is: 65.254.61.250 Will routing like this help (Command is issued in 200.0.0.20, the RDP location): route ADD 65.254.61.250 MASK 255.255.255.192 200.0.0.193 Couldn't add gives the error: The route addition failed: The parameter is incorrect. I tried before connecting to VPN.

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  • Multiple Wi-Fi cards and Internet connections on Windows 7

    - by Dpp
    I have two Wi-Fi cards and two separate Internet connections. I connect to the Internet with both of them but one does all of the Internet transactions (and I have not seen any place where I can specify which one I would prefer to use!) What I would like to do is use one of them for the browser and Skype only, and the other one for stock exchange software for instance. Is this is possible?

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  • SMTP Client implementation [on hold]

    - by orif
    I'm implementing SMTP client. What should the client do once it already sent the "." at the end of the mail, but didn't receive "250 Ok"? This is how the conversation between the client and server look like: Server Response: 220 www.sample.com ESMTP Postfix Client Sending : HELO domain.com Server Response: 250 Hello domain.com Client Sending : MAIL FROM: <[email protected]> Server Response: 250 Ok Client Sending : RCPT TO: <[email protected]> Server Response: 250 Ok Client Sending : DATA Server Response: 354 End data with <CR><LF>.<CR><LF> Client Sending : Subject: Example Message Client Sending : From: [email protected] Client Sending : To: [email protected] Client Sending : Client Sending : TEST MAIL Client Sending : Client Sending : . Server Response: 250 Ok: queued as 23411 Client Sending : QUIT I'm not sure what should I do if the client sends "." and doesn't receive the 250 Ok - because of possible network error. Was the "." sent or not? Should the client resend the mail - and - maybe - duplicate the item, or not - and risk in losing an important mail item? Thank you.

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  • How to use aliases for remote hosts when accessing locally

    - by alexloh
    I would like to use an alias for a remote host. For example, when instead of "ping giraffe.foo.bar.com" I want to do "ping giraffe", but only when I do it from my own machine. I am able to do this for raw IP addresses by adding an entry in /etc/hosts (ie "123.456.1.0 giraffe"), but it does not seem to work for host names.

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  • Accesing internet with Host-Only network VirtualBox

    - by Bibo
    I have two VMs in my VirtualBox. Both are FreeBSD and should communicate between each other. I have created network with DHCP enabled and set like this: Server Address 10.10.10.1 Server Mask 255.255.255.0 Lower Address Bound 10.10.10.100 Upper Address Bound 10.10.10.200 My VMs are pinging each other and getting right ip adress. This is what I must have and can´t change. Now I want to access internet from one VM and I found that I must use two network cards but I don´t know how to set the second one. I am new with VirtualBox and this stuff so if you count with this in you answer I would appreciate that. And I have Windows 8 as host system if it´s matter.

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