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  • Boot xen server through ipxe

    - by Ghassen Telmoudi
    I'm want install Xen Server 6.2 though ipxe, I tried different configurations, no luck making to work until now. I found some may example to boot from pxe using TFTP server, and here is an example: default xenserver-auto label xenserver-auto kernel mboot.c32 append xenserver/xen.gz dom0_max_vcpus=1-2 dom0_mem=752M,max:752M com1=115200,8n1 console=com1,vga --- xenserver/vmlinuz xencons=hvc console=hvc0 console=tty0 answerfile=http://[pxehost]/answerfile.xml remotelog=[SYSLOG] install --- xenserver/install.img The problem is that ipxe uses different syntax, I could not figure out how to convert this configuration to work on ipxe. Here is my ipxe file so far: #!ipxe echo "XEN Server is booting up" initrd http://server-ip/pxe/xen/boot/xen.gz kernel http://server-ip/pxe/xen/boot/pxelinux/mboot.c32 boot Can any one supply the correct configuration?

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  • Bring internet connection to ssh target machine via tunnel?

    - by Calvin
    I have a CentOS 5 machine deep inside firewalls that's only reachable via ssh on an unconventional port, let's say 98765. I normally connect to this machine like this: ssh -P 98765 user@ip -L5900:localhost:5900 I need to run yum to install some packages on this machine, but it's not possible since the outbound ports are all closed on this machine. I want to do something like this to "bring my internet connection" to this machine: ssh -P 98765 user@ip -L5900:localhost:5900 -R80:localhost:80 -R21:localhost:21 My intention is that, when I run yum on the machine, yum will use port 80 and 21 through my originating machine. Is something like this even possible?

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  • Two Router issue, cannot reach internet

    - by DeBuGGeR
    I have on ADSL router and one CISCO Wifi Router. The ADSL Router is working fine on its own. I am connecting the lan port of the ADSL Router to the internet(RJ45) port of my Cisco wifi router. But I cannot access the internet from the Cisco router, neither through wifi nor through ethernet connection. The IP of ADSL router is 192.168.1.1 and the ip of my Wifi router is 192.168.1.100. Should I connect to the LAN port of my Wifi router rather than using the ethernet port(Marked as Internet)?

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  • How to setup separate MySQL and PHP VPS servers

    - by Fazal
    Someone recommended I should have my MySQL server separate from my Apache/PHP server in case of hacking and such. By visiting linode, slicehost and various articles here on serverfault I've managed to cobble together a decent set of instructions on how to do the Apache/PHP bit. I'm using Rackspace VPS and they provide an internal IP for each server. If I setup a MySQL VPS, should I assume that I would just add the internal IP for the database host? And I guess that I would only need to open up my default ssh port and mysql ports and install phpmyadmin on there? Ideally I would have webserver.mydomain.com and dbserver.mydomain.com (two 256mb VPS's) with servermin on webserver.mydomain.com and phpmyadmin on dbserver.mydomain.com. If anyone has any guides or advice on how to setup this type of solution I'd be more then grateful!

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  • Can't connect to a machine via Cisco VPN on Mac

    - by Alex
    Hi there, I have a curious problem. I can connect to work's vpn using Cisco VPN Client. I can get internet through that vpn. When I go check the IP online it tells me the IP address of the server I connected. However, when I try to ping one of the machines at work I get nothing. And traceroute says there is no route to the destination. But works for google. Any ideas? Is some traffic not sent through the VPN on mac Alex

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  • VPN only connects to its server!

    - by Eddie
    Hi guys; Previously I bought a windows 2003 VPS and enabled routing and remote access so that users can make a vpn connection. I turend the firewall off and everything was working fine. But since 2 days ago whenever I try and connect to vpn it connects to vpn without any problem and I can see the connection status however it only connects to the server I mean what I can do with this vpn is to connect to the server via remote desktop and I can ping only the server's IP, neither I can open any webpages in browsers or ping other IP addresses beside the server one! I've also rebuilt the server and configured it for routing access and vpn connection from the beginning but it doesn't work either. It seems that server fails to route the traffic properly, as i'm sure that the firewall has been turned off I can't figure out what's the reason, any idea what's going on? Thanks in advance

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  • Multicast doesn't seem to be working on RHEL 5.5

    - by NullUser
    I'm trying to install Oracle Grid Infrastructure on two machines. Their documentation states You must enable multicasting for the cluster on the IP address subnet ranges 224.0.0.0/24 and 230.0.1.0/24 So I ran: route add -net 224.0.0.0/24 dev eth2 route add -net 230.0.1.0/24 dev eth2 route -n produces: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 230.0.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 224.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 # and others An ifconfig eth2 shows, among other things, UP BROADCAST RUNNING MULTICAST. However, when I run their multicast test utility, it fails me: Test for Multicast address 230.0.1.0 Sep 3 19:40:39 | Multicast Failed for eth2 using address 230.0.1.0:42000 Test for Multicast address 224.0.0.251 Sep 3 19:41:10 | Multicast Failed for eth2 using address 224.0.0.251:42001 What am I doing wrong?

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  • VM can’t connect to outside in bridged mode

    - by Kamal
    Hi Guys, I am not able to ping any machine(not even the host) from Guest VM in bridged mode. But I got an IP which is on the same subnet as host. I can ping my guest VM from the host and can use ssh to connect to the guest. I am using Vmware workstation 6.5. Guest VM is a centos VM and host is windows xp. Every thing works fine in NAT mode. Any clues as to what could be happening. I tried disabling all the firewalls I have. My virtual network editor shows that my ethernet adapter(the one my host uses) is used for bridging. It is connected. I don't understand how I can get an IP address from DHCP server. I can't ping any of the DNS servers in generated /etc/resolv.conf which are the same as that of my host

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  • Issues getting a Cisco WLC 5508 to find AIR-LAP1142N

    - by user95917
    hoping someone can help me with a problem here. I'm attempting to setup a test (loan from Cisco) wireless network. Here's what i've got/done: 5508 Controller - Service Port IP set to 10.74.5.2 /24. Management IP set to 10.74.6.2 /24 with a default gateway of 10.74.6.1. Virtual IP set to 1.1.1.1. Copper SFP in slot 7, CAT5 (known good) going from there to port 1/0/47 on the switch. Green lights on both ends. 2960-S Switch - Vlan1 - 10.74.6.1 /24. dhcp pool 10.74.6.0 /24, default router 10.74.6.1. excluded-address 10.74.6.1, 10.74.6.2. 1/0/4 on the switch is set to switchport mode access and no shut. 1/0/47 on the switch is setup to switchport mode trunk and no shut. 1/0/4 has a CAT5 (known good) cable going from there to the AP. When I do a sh cdp nei from the switch, i can see the AP and Controller listed. When i configure my PC's nic to 10.74.5.5, and plug a cable from my nic to the SP port on the controller i can get on the device via the gui. In there, the only errors/info that show up in the trap are: Link Up: Slot: 0 Port: 7 Controller time base status - Controller is out of sync with the central timebase. I've manually set the time but apparently that's not quite the problem (or at least not the entire problem). When i plug the AP in, i see on the switch console that it grants it power, it sees it connect...but the controller won't see it for some reason. From what i've read you shouldn't have to do anything to the AP as it's managed by the controller...but i'm not sure what setting I'm missing for it to work. The AP light on top is continually cycling green, red, yellow. When I first start it up, it blinks green for 20 or so seconds, then goes to solid green for another 20 seconds or so, then flashes blue, green, red for awhile...but always ends up goinn back to the standard, green, red, yellow. Does anyone see any obvious issues with my setup or have any suggestions as to why i might be having a problem? Thanks for your help!

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  • MacBook can't use internet, but nslookup and ping both work

    - by Joel Coehoorn
    I have a user with a new high-end MacBook Pro that can't use the internet. He can connect to either our wired or wireless network and do things like browse file shares, but can get no further. When I brought the machine in for testing, I found that I could do an nslookup just fine, and I'm able to ping addresses returned by nslookup just fine. I'm even able to bring up web pages by entering the IP address into the address bar directly. However, when I try to ping the domain name rather than the IP address, it just sits there. So apparently I can either do name resolution or communicate with an address, but not both at the same time. Again, these symptoms occur on both the wired and wireless network. Other machines on our network, including a few other Macs, don't have this issue. Any ideas?

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  • How do I configure multiple domain names on my IIS server?

    - by Dillie-O
    We have a few websites that we are running on one instance of IIS that need to be mapped for each of their domain names. For example. Site A has the domain name coolness.com Site B has the domain name 6to8Weeks.com Site C has the domain name PhatTech.com When I look at the "Web Site Identification" section of the IIS configuration window, I notice that I can specify an IP address and port, but if I click the Advanced button, I can also configure the site based on host header values as well. How do I configure each site in IIS? Ideally I would like them to all be able to listen to port 80, so I don't have weird URLs, but I'm not sure if I do this using headers, IP addresses, both, or something else.

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  • Route gameserver traffic through cloudflare?

    - by Michael
    I use cloudflare for my website and we have a gameserver I was wondering if it is possible to route traffic through cloudflare. This recently sprung into my head when I realized that I could route Shoutcast through another of cloudflares port (8080) which does not do any performance enhancing or anything it just acts as a reverse proxy and stops DDoS. I then tried by setting up a subdomain with my gameserver IP cloudflared and then pinged the IP and Port. It seems to have connections but when actually connecting via the game it doesnt. Any ideas?

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  • 6to4 tunnel: cannot ping6 to ipv6.google.com?

    - by quanta
    Hi folks, Follow the Setup of 6to4 tunnel guide, I want to test ipv6 connectivity, but I cannot ping6 to ipv6.google.com. Details below: # traceroute 192.88.99.1 traceroute to 192.88.99.1 (192.88.99.1), 30 hops max, 40 byte packets 1 static.vdc.vn (123.30.53.1) 1.514 ms 2.622 ms 3.760 ms 2 static.vdc.vn (123.30.63.117) 0.608 ms 0.696 ms 0.735 ms 3 static.vdc.vn (123.30.63.101) 0.474 ms 0.477 ms 0.506 ms 4 203.162.231.214 (203.162.231.214) 11.327 ms 11.320 ms 11.312 ms 5 static.vdc.vn (222.255.165.34) 11.546 ms 11.684 ms 11.768 ms 6 203.162.217.26 (203.162.217.26) 42.460 ms 42.424 ms 42.401 ms 7 218.188.104.173 (218.188.104.173) 42.489 ms 42.462 ms 42.415 ms 8 218.189.5.10 (218.189.5.10) 42.613 ms 218.189.5.42 (218.189.5.42) 42.273 ms 42.300 ms 9 d1-26-224-143-118-on-nets.com (118.143.224.26) 205.752 ms d1-18-224-143-118-on-nets.com (118.143.224.18) 207.130 ms d1-14-224-143-118-on-nets.com (118.143.224.14) 206.970 ms 10 218.189.5.150 (218.189.5.150) 207.456 ms 206.349 ms 206.941 ms 11 * * * 12 10gigabitethernet2-1.core1.lax1.he.net (72.52.92.121) 214.087 ms 214.426 ms 214.818 ms 13 192.88.99.1 (192.88.99.1) 207.215 ms 199.270 ms 209.391 ms # ifconfig tun6to4 tun6to4 Link encap:IPv6-in-IPv4 inet6 addr: 2002:x:x::/16 Scope:Global inet6 addr: ::x.x.x.x/128 Scope:Compat UP RUNNING NOARP MTU:1480 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:11 dropped:0 overruns:0 carrier:11 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) # iptunnel sit0: ipv6/ip remote any local any ttl 64 nopmtudisc tun6to4: ipv6/ip remote any local x.x.x.x ttl 64 # ip -6 route show ::/96 via :: dev tun6to4 metric 256 expires 21332777sec mtu 1480 advmss 1420 hoplimit 4294967295 2002::/16 dev tun6to4 metric 256 expires 21332794sec mtu 1480 advmss 1420 hoplimit 4294967295 fe80::/64 dev eth0 metric 256 expires 15674592sec mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev eth1 metric 256 expires 15674597sec mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev tun6to4 metric 256 expires 21332794sec mtu 1480 advmss 1420 hoplimit 4294967295 default via ::192.88.99.1 dev tun6to4 metric 1 expires 21332861sec mtu 1480 advmss 1420 hoplimit 4294967295 # ping6 -n -c 4 ipv6.google.com PING ipv6.google.com(2404:6800:8005::68) 56 data bytes From 2002:x:x:: icmp_seq=0 Destination unreachable: Address unreachable From 2002:x:x:: icmp_seq=1 Destination unreachable: Address unreachable From 2002:x:x:: icmp_seq=2 Destination unreachable: Address unreachable From 2002:x:x:: icmp_seq=3 Destination unreachable: Address unreachable --- ipv6.google.com ping statistics --- 4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 2999ms What is my problem? Thanks,

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  • Wordpress site on EC2 instance suddenly superslow

    - by Emil
    Set up a wordpress page the other day following this guide. The site was up and running, loading quickly and all was well, until today. Suddenly, loading the site takes forever and doesn't even work properly, the page shows up in an incomplete fashion. I tried rebooting the instance but that didn't help. The only actions I've taken on the server is to create an elastic IP, and to point a domainname to that IP. But I don't see how that could've slowed down the page. Any thoughts on what could have caused this and on a solution to the problem?

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  • Swiching webhosting company & database erros.

    - by gipap
    Well here comes the situation. I used to have CompanyA for webhosting. (The hosting plan was a shared one). I decided to change the hosting provider and transfer my website to CompanyB, (exclusive IP). The issue that i face is that my webpage is now displayed in two different IP addresses. So i decided to turn-off the website served by the CompanyA. Now the problem is that my database driven website, served by CompanyB, is not driven anymore, although i have added the A record mssql.mywebsite.com with the ipaddress of the database. (The database is served by dedicated db's server). So, what am i doing wrong here?

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  • How is the MTU is 65535 in UDP but ethernet does not allow frame size more than 1500 bytes

    - by nikku
    I am using a fast ethernet of 100 Mbps, whose frame size is less than 1500 bytes (1472 bytes for payload as per my textbook). In that, I was able to send and receive a UDP packet of message size 65507 bytes, which means the packet size was 65507 + 20 (IP Header) + 8 (UDP Header) = 65535. If the frame's payload size itself is maximum of 1472 bytes (as per my textbook), how can the packet size of IP be greater than that which here is 65535? I used sender code as char buffer[100000]; for (int i = 1; i < 100000; i++) { int len = send (socket_id, buffer, i); printf("%d\n", len); } Receiver code as while (len = recv (socket_id, buffer, 100000)) { printf("%d\n". len); } I observed that send returns -1 on i > 65507 and recv prints or receives a packet of maximum of length 65507.

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  • Windows 8 Pro Remote Desktop issue

    - by Mike C.
    I have a weird issue here. I'm running Windows 8 Pro. The client computer is also running Windows 8 Pro. Remote Desktop works when I'm in the same network. I tried connecting using my external IP Address and my DynDNS account, neither works. I disabled Windows Firewall and setup DMZ for my computer on the router, still can't get remote desktop to work. I verified www.canyouseeme.org, port 3389 is open, which is obvious since I'm running DMZ! My ISP, Bell Canada (modem/router: Sagemcom F@st 2864), blocks port 80 and 25, but I don't need those for RDP, do I? The funny thing is RDP rejects the connection instantaneously for my IP or DynDNS while it takes a while for another address. Thank you, Michael

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  • Should I remove all unmanged switches from my network?

    - by IMAbev
    I have a office network with approx 150 devices (computers/printers/ip phones). Almost all of the end point devices have straight run Cat5e from my Hp switches directly to the device. IP phones for each end user sit between the hp switch and computer. (hp switch - in to phone out of phone in to computer) While I have gotten rid of most of them, I still have a couple linksys unmanaged switches that split off to 2 or more devices. I have heard various reasons for removing these switches but not entirely sure if it actually degrades the network. I agree that eliminating these switches certainly cleans up the network from a management standpoint. Are these unmanaged switches bad for my network? Is there a clear advantage to having 'home run' cable runs to each of my end point devices?

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  • Ping computername - result format

    - by kamleshrao
    Hi, I am trying PING command on my Windows 7 PC after many months. While doing this, I notice the following result: Ping using computer name: D:\>ping amdwin764 Pinging AMDWIN764 [fe80::ac53:546f:a730:8bd6%11] with 32 bytes of data: Reply from fe80::ac53:546f:a730:8bd6%11: time=1ms Reply from fe80::ac53:546f:a730:8bd6%11: time=1ms Reply from fe80::ac53:546f:a730:8bd6%11: time=1ms Reply from fe80::ac53:546f:a730:8bd6%11: time=1ms Ping statistics for fe80::ac53:546f:a730:8bd6%11: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 1ms, Maximum = 1ms, Average = 1ms Ping using IP address: D:\>ping 192.168.1.2 Pinging 192.168.1.2 with 32 bytes of data: Reply from 192.168.1.2: bytes=32 time=75ms TTL=128 Reply from 192.168.1.2: bytes=32 time=1ms TTL=128 Reply from 192.168.1.2: bytes=32 time=1ms TTL=128 Reply from 192.168.1.2: bytes=32 time=1ms TTL=128 Ping statistics for 192.168.1.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 1ms, Maximum = 75ms, Average = 19ms Why am I not getting the Ping results with Numeric IP address in my first example? Thanks, Kamlesh

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  • How to specify what network interface to use with TTCP or IPERF?

    - by Sammy
    The PC has two Gigabit Ethernet ports. They function as two separate network adapters. I'm trying to do a simple loopback test between the two. I've tried TTCP and IPERF. They're giving me hard time because I'm using the same physical PC. Using pcattcp... On the receiver end: C:\PCATTCP-0114>pcattcp -r PCAUSA Test TCP Utility V2.01.01.14 (IPv4/IPv6) IP Version : IPv4 Started TCP Receive Test 0... TCP Receive Test Local Host : GIGA ************** Listening...: On TCPv4 0.0.0.0:5001 Accept : TCPv4 0.0.0.0:5001 <- 10.1.1.1:33904 Buffer Size : 8192; Alignment: 16384/0 Receive Mode: Sinking (discarding) Data Statistics : TCPv4 0.0.0.0:5001 <- 10.1.1.1:33904 16777216 bytes in 0.076 real seconds = 215578.95 KB/sec +++ numCalls: 2052; msec/call: 0.038; calls/sec: 27000.000 C:\PCATTCP-0114> On the transmitter end: C:\PCATTCP-0114>PCATTCP.exe -t 10.1.1.1 PCAUSA Test TCP Utility V2.01.01.14 (IPv4/IPv6) IP Version : IPv4 Started TCP Transmit Test 0... TCP Transmit Test Transmit : TCPv4 0.0.0.0 -> 10.1.1.1:5001 Buffer Size : 8192; Alignment: 16384/0 TCP_NODELAY : DISABLED (0) Connect : Connected to 10.1.1.1:5001 Send Mode : Send Pattern; Number of Buffers: 2048 Statistics : TCPv4 0.0.0.0 -> 10.1.1.1:5001 16777216 bytes in 0.075 real seconds = 218453.33 KB/sec +++ numCalls: 2048; msec/call: 0.037; calls/sec: 27306.667 C:\PCATTCP-0114> It's responding alright. But why does it say 0.0.0.0? Is it passing through only one of the network adapters? I want 10.1.1.1 to be the server (receiver) and 10.1.1.2 to be the client (transmitter). These are the IP addresses assigned manually to each network adapter. How do I specify these addresses in TTCP? There is also the IPERF tool which has the -B option. Unfortunately I've been only able to use this option to bind the server to the 10.1.1.1 address. I was unable to bind the client to the 10.1.1.2 address. I might be doing it wrong. Can the -B option be used for both the server as well as the client side? What does the syntax look like for the client?

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  • VPN Split Tunneling - Pros and Cons and how to achieve?

    - by Theveloper
    Well this is the dilemma, I want remote clients to connect to my network and only route local access through the VPN. This is split tunneling, the client uses its internet connection for all other internet requests and the VPN tunnel to my network for local requests. There's a couple of issues that arise: split tunneling in Windows is achieved by unticking an option which reads "Use default gateway on remote network" in the TCP/IP settings of the client VPN connection. At any point the user can tick it and route all his internet traffic through my network eating away at my bandwidth and being cloaked by my IP address. This is unacceptable. Issue number 2 is that if the client is split tunneling, he becomes a gateway between the internet and my network, this is also unacceptable. My questions are: how does one achieve split tunneling serverside? And is the latter issue a valid con worthy of worry? Any thoughts would be appreciated!

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  • Failed reverse DNS and SPF only when using Thunderbird!

    - by TruMan1
    I have a reverse DNS and SPF records correctly setup for my mail server. Sending webmail from it works perfect. The problem is when Thunderbird sends out emails, it is using the client's IP address for the hostname. I have SMTP authentication and specified my mail server's as the outgoing SMTP. Mail is being sent, but it is not "signing" the email with the mail server's IP address.. it is using the client's. Is there any way to fix this? This is the spam error I get when sending from Thunderbird: Spam: Reverse DNS Lookup, SPF_SoftFail

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  • Can /etc/hosts.deny/allow be overridden?

    - by Tar
    I have security measures put in place to keep unwanted users out of my server. I've changed the SSH port, disabled root login, have a software firewall to block portscans, and have entries in hosts.deny and hosts.allow. I have various services denied to all but another server of mine should my IP change, and two other administrators + my own IP address. My question is, can hosts.deny/allow configuration be overridden so that they can gain access to my server? Does using chroot jail for running things like an IRC server and Teamspeak server prevent people from gaining access to my server and screwing with it?

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