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  • what are valid 'ack' values?

    - by WileECanisLatrans
    having an issue with a vendor who claims the cause of a problem is an invalid 'ack' value in the tcp data. I'm using java so I didn't write this layer. I used snoop to capture the traffic on the wire and am using wireshark to display the data. Here is what is happening. After receiving a multi-packet(5) message I see a multi-pack(3) response. The first packet in the response has a value for 'ack' that is different than the 'ack' value in the other two packets. The vendor claims this data is suspect. I've provided sample data below. I'm not a tcp expert so I don't know if this is a problem or not. I've tried to find something on valid ack values and it seems to me the value should be 80018 but that doesn't mean the 78345 is wrong. I found this on the web and it seems to apply but I'm not sure: "the ack value of any data segment is considered valid as long as it does not acknowledge data ahead of the next segment to send". Thanks for your help. My understanding is the vendor has written their own tcp layer. * source seq ack len * vendor 75465 10924 0 * vendor 75465 10924 1440 * vendor 76905 10924 1440 * vendor 78345 10924 1440 * vendor 79785 10924 233 * me 10924 78345 0 * me 10924 80018 0 * me 10924 80018 197

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  • Routing / binding 128 IPs to one server

    - by Andrew
    I have a Ubuntu server with 128 ip's (static external ips 86.xx.xx.16), and I want to crawl pages thru different ip's. The gateway is xx.xxx.xxx.1, the main ip is xx.xxx.xxx.16, and the other 128 ip's are xx.xxx.xxx.129/255. I tried this configuration in /etc/network/interfaces but I doesn't work. It work if I remove the gateway for the aliases eth0:0 and eth0:1. I think this is routing problem. auto lo iface lo inet loopback auto eth0 auto eth0:0 auto eth0:1 iface eth0 inet static address xx.xxx.xxx.16 netmask 255.255.255.128 gateway xx.xxx.xxx.1 iface eth0:0 inet static address xx.xxx.xxx.129 netmask 255.255.255.128 gateway xx.xxx.xxx.1 iface eth0:1 inet static address xx.xxx.xxx.130 netmask 255.255.255.128 gateway xx.xxx.xxx.1 Also, please tell me how to "reset" every changes that I made in networking and routing. Update: I removed the gateway and now it works. I can reach the website thru all 128 ip's. But when I try to bind a socket connection in php to a specific ip I get no answer. socket_bind($sock, "xx.xxx.xx.xxx"); socket_connect($sock, 'google.com', 80); I tryed to use a sniffer to see the packets, and I see the packet sent from binded ip to google.com but the "connection" can't be established. I don't know anything about "route" command, but I have a feeling that this is the solution.

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  • Access server using IP on another interface

    - by Markos
    I am using Windows Server 2012 instead of a router for my home network. Currently I am using RRAS and computers from local network can access Internet correctly. Here is a map of the current setup: [PC1] ---| |---- (lan ip)[Server](wan ip)--> internet [PC2] ---| I have applications running on Server, such as IIS and others. All can be accessed from internet using wan ip and from lan using lan ip. I have a domain, lets say its my-domain.com, which is resolved to my wan ip. What I want is to enable my LAN computers to be able to connect to services on my server using the very same address as internet users: eg http://my-domain.com/. However this does not work for my lan computers. What I understand is that I need to set up some kind of loopback route in a way that packets comming to LAN interface get routed to WAN interface. But I haven't found how to achieve this (in fact, I don't know WHAT to search for). Feel free to ask for additional informations and I will try to update the question.

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  • What's going on with traceroute?

    - by Kevin
    The following is what happens when I run traceroute from a certain location: # traceroute google.com traceroute to google.com (74.125.227.39), 30 hops max, 60 byte packets 1 gateway.local.enactpc.com (10.0.0.1) 0.138 ms 0.101 ms 0.084 ms 2 * * * 3 * * * 4 * * * 5 * * * 6 * * * 7 * * * 8 * * * 9 * * * 10 * * * 11 * * * 12 * * * 13 * * * 14 * * * 15 * * * 16 * * * 17 * * * 18 * * * 19 * * * 20 * * * 21 * * * 22 * * * 23 * * * 24 * * * 25 * * * 26 * * * 27 * * * 28 * * * 29 * * * 30 * * * Absolutely nothing of interest... Now, originally I thought this was just a fact of the location's network set up. (I assume they block pings or something...) However, watch what happens when I use nmap to run a traceroute... # nmap -sP --traceroute google.com Starting Nmap 5.21 ( http://nmap.org ) at 2012-09-25 22:18 CDT Nmap scan report for google.com (74.125.227.40) Host is up (0.034s latency). Hostname google.com resolves to 11 IPs. Only scanned 74.125.227.40 rDNS record for 74.125.227.40: dfw06s06-in-f8.1e100.net TRACEROUTE (using proto 1/icmp) HOP RTT ADDRESS 1 0.19 ms gateway.local.enactpc.com (10.0.0.1) 2 1.93 ms 99-20-92-1.lightspeed.austtx.sbcglobal.net (99.20.92.1) 3 25.61 ms 99-20-92-2.lightspeed.austtx.sbcglobal.net (99.20.92.2) 4 ... 6 7 23.68 ms 12.83.68.137 8 31.30 ms gar23.dlstx.ip.att.net (12.122.85.73) 9 ... 10 31.82 ms 72.14.233.65 11 32.27 ms 209.85.250.77 12 32.98 ms dfw06s06-in-f8.1e100.net (74.125.227.40) Nmap done: 1 IP address (1 host up) scanned in 3.29 seconds When using nmap I get A LOT more results than with traceroute, why? Note, I checked, and the difference in target IP addresses is not related...

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  • Can I use iptables on my Varnish server to forward HTTPS traffic to a specific server?

    - by Dylan Beattie
    We use Varnish as our front-end web cache and load balancer, so we have a Linux server in our development environment, running Varnish with some basic caching and load-balancing rules across a pair of Windows 2008 IIS web servers. We have a wildcard DNS rule that points *.development at this Varnish box, so we can browse http://www.mysite.com.development, http://www.othersite.com.development, etc. The problem is that since Varnish can't handle HTTPS traffic, we can't access https://www.mysite.com.development/ For dev/testing, we don't need any acceleration or load-balancing - all I need is to tell this box to act as a dumb proxy and forward any incoming requests on port 443 to a specific IIS server. I suspect iptables may offer a solution but it's been a long while since I wrote an iptables rule. Some initial hacking has got me as far as iptables -F iptables -A INPUT -p tcp -m tcp --sport 443 -j ACCEPT iptables -A OUTPUT -p tcp -m tcp --dport 443 -j ACCEPT iptables -t nat -A PREROUTING -p tcp --dport 443 -j DNAT --to 10.0.0.241:443 iptables -t nat -A POSTROUTING -p tcp -d 10.0.0.241 --dport 443 -j MASQUERADE iptables -A INPUT -j LOG --log-level 4 --log-prefix 'PreRouting ' iptables -A OUTPUT -j LOG --log-level 4 --log-prefix 'PostRouting ' iptables-save > /etc/iptables.rules (where 10.0.0.241 is the IIS box hosting the HTTPS website), but this doesn't appear to be working. To clarify - I realize there's security implications about HTTPS proxying/caching - all I'm looking for is completely transparent IP traffic forwarding. I don't need to decrypt, cache or inspect any of the packets; I just want anything on port 443 to flow through the Linux box to the IIS box behind it as though the Linux box wasn't even there. Any help gratefully received... EDIT: Included full iptables config script.

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  • Strange network connectivity problem

    - by Marc
    Here is my network connectivity: cable modem | |(WAN) wrt54g (default gateway, 192.168.1.1) -- earth |(LAN) | Simple Switch1 | | | | | SimpleSwitch2- neptune | | | | mars mercury | |- venus | |- laptop | saturn (Windows AD DC) simpleSwitch2 was hanging off the wrt54g. I moved it to SW1 during troubleshooting. Nothing described below was any different. earth is connected via wireless to the wrt54g. I can ping from laptop to mars, neptune & mercury. I can ping from earth to venus, saturn & laptop. However, pinging mars, mercury or neptune from earth gives the following result. Pinging mars.XXX.XXX [192.168.1.105] with 32 bytes of data: Reply from 192.168.1.122: Destination host unreachable. Reply from 192.168.1.122: Destination host unreachable. Reply from 192.168.1.122: Destination host unreachable. Reply from 192.168.1.122: Destination host unreachable. Ping statistics for 192.168.1.105: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), .122 is the address of the machine from which I am pinging. earth is a Vista machine. Windows firewall is off. saturn is my DNS & DHCP server. Can anyone give me any ideas what the h*ll is going on? Clearly the topology is a factor And yes, I am a space geek.

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  • Linux port-based routing using iptables/ip route

    - by user42055
    I have the following setup: 192.168.0.4 192.168.0.6 192.168.0.1 +-----------+ +---------+ +----------+ |WORKSTATION|------| LINUX |------| GATEWAY | +-----------+ +---------+ +----------+ 192.168.150.10 | 192.168.150.9 +---------+ | VPN | +---------+ 192.168.150.1 WORKSTATION has a default route of 192.168.0.6 LINUX has a default route of 192.168.0.1 I am trying to use the gateway as the default route, but route port 80 traffic via the VPN. Based on what I read at http://www.linuxhorizon.ro/iproute2.html I have tried this: echo "1 VPN" >> /etc/iproute2/rt_tables sysctl net.ipv4.conf.eth0.rp_filter = 0 sysctl net.ipv4.conf.tun0.rp_filter = 0 sysctl net.ipv4.conf.all.rp_filter = 0 iptables -A PREROUTING -t mangle -i eth0 -p tcp --dport 80 -j MARK --set-mark 0x1 ip route add default via 192.168.150.9 dev tun0 table VPN ip rule add from all fwmark 0x1 table VPN When I run "tcpdump -i eth0 port 80" on LINUX, and open a webpage on WORKSTATION, I don't see the traffic go through LINUX at all. When I run a ping from WORKSTATION, I get this back from some packets: 92 bytes from 192.168.0.6: Redirect Host(New addr: 192.168.0.1) Vr HL TOS Len ID Flg off TTL Pro cks Src Dst 4 5 00 0054 de91 0 0000 3f 01 4ed3 192.168.0.4 139.134.2.18 Is this why my routing is not working ? Do I need to put GATEWAY and LINUX on different subnets to prevent WORKSTATION being redirected to GATEWAY ? Do I need to use NAT at all, or can I do this with routing alone (which is what I want) ?

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  • Nginx proxy to IIS Connection Timeout

    - by MitMaro
    I am having an issue with random timeouts with a Nginx proxy connecting to an IIS machine. I have been watching a packet capture between the two servers and it seems that the IIS machine is receiving a SYN packet but is not responding with what I think should be an ACK response. Before the timeout occurs there seems to be a slower response from the IIS server. There is no unusual memory or processor usage on the IIS or Nginx machine. Some information on the servers and setup: Nginx Machine: Ubuntu 10.04 64bit Nginx 0.7.65 Amazon EC2 Windows Machine: Windows Server 2008 IIS 7 ASP.net Application in Integrated Mode Nginx Error: 2011/01/10 17:57:40 [error] 8297#0: *30 connect() failed (110: Connection timed out) while connecting to upstream, client: 209.***.***.***, server: secure.example.com, request: "GET /a/path/deliver.aspx HTTP/1.1", upstream: "http://***.***.***.****:****//another/path/deliver.aspx", host: "secure.example.com" WireShark Packets 6521.449528 10.***.***.*** -> 174.***.***.*** TCP 38695 > us-cli [SYN] Seq=0 Win=5840 Len=0 MSS=1460 TSV=477422103 TSER=0 WS=7 6524.443239 10.***.***.*** -> 174.***.***.*** TCP 38695 > us-cli [SYN] Seq=0 Win=5840 Len=0 MSS=1460 TSV=477422403 TSER=0 WS=7 6530.443241 10.***.***.*** -> 174.***.***.*** TCP 38695 > us-cli [SYN] Seq=0 Win=5840 Len=0 MSS=1460 TSV=477423003 TSER=0 WS=7

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  • Port knocking via SSH tunnels

    - by j0ker
    I have a server running in my university's internal network. There is only one SSH daemon running which is secured by port knocking with knockd. Works fine if I try to connect from within the internal network. But since the server has no external IP, I have to tunnel into the internal network every time I want to access the server from outside. And since tunneling only works for a single port I cannot do the port knocking as easily as from an internal client. In fact, I don't get it to work at all. What I'm trying is opening tunnels for all the different ports that have to be knocked. Then I send TCP-SYN packets into the tunnels. But that doesn't work even for a single port. If I establish the tunnel on the first port in the knock sequence and send a packet through it, it doesn't reach the server. There is no entry in the log file of knockd, while there should be something like 123.45.67.89: openSSH: Stage 1 (as shown with internal knocks). So I guess, the problem doesn't exist within my knocking script but is a more general one. Are there any known problems with what I'm trying to do? Is it even possible or am I missing something? Thanks in advance!

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  • NAT and P2P router crash

    - by returnFromException
    So..i had this argument with my networks teacher. He said that some people complains about router crashes due to many entrys on NAT tables on a router. I didnt understand and i asked: "If the application uses the same port, why does the router crash?. It should have only one entry (pc-ip,pcport;public-ip,public-port)". And he said: "it doesnt matter its using the same port". I got the idea that NAT creates an entry for every packet that passes trought it. Iam assuming NAT with overloading as you might have guessed. So the questions are: 1-How does nat entrys are created? On a packet basis or connection basis? I mean: suppose i send a udp packet..does the router create an entry? 2-When i start a TCP connection, does the router create a persistant nat entry until the connection closes? 3-Was my teacher right? The NAT table can overload assuming an aplication on the same port sending packets? Thanks in advance.

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  • wireless router - configuring for low-latency, high traffic environment

    - by Mark C
    Hey all, I have a few questions about configuring a router to achieve low-latency, high speed throughput on a local area network that is not connected to the internet. I've read up on some stuff, but thought I would solicit some opinions here on what I've found and what I want to know.... Turn off SSID broadcast - it produces extraneous packets that all clients receive and reply (?) to. Not a huge deal, but it may help a bit. Mixed-mode off - I should attempt to have all devices using the same standard (e.g. 802.11n) and turn mixed-mode off. Any thoughts on security? Does having WEP or any of the WPA variants actually increase latency? Nothing super secure is going over this LAN so if turning security off made things better, that'd be cool. Any other thoughts or things to focus on to create the low latency environment I'm trying to go for would be great. Links to webpages and papers are also cool. I'm open to go through a bunch of stuff. Thanks in advance!

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  • SBS2011 Standard DNS suddenly not resolving some domains

    - by Matt
    Suddenly today I am unable to resolve common domains like serverfault.com, facebook.com; but other domains like google.com, cnn.com work fine. This is on a client machine (Win7 Pro) connected to an SBS2011 Standard domain. The only DNS server is the SBS2011 server. The same domains work fine on all client PCs I have tried, and the same ones do not work. Using nslookup, I get 'no such domain' errors for facebook.com, and the correct DNS entries for the ones that do work. When I add Google's Public DNS to my client PC as a backup (primary = local SBS server, secondary = 8.8.8.8), everything works fine for my client PC, but querying from the SBS server directly or from other client PCs are broken (so I don't believe it's a firewall issue). My main question is how can I see what servers the SBS2011 server queries if it doesn't know about a domain? There is nothing in our firewall logs that say it blocked any DNS-based packets, but I also wanted to query based on the IP/FQDN on the servers that the SBS server was likely to contact to find out about facebook.com for example. Update 23/05/2012: It appears DNS is working again this morning for the affected websites. Both the DC on its own and all client PCs can once again access the websites that were not loading last night, as well as the websites that were working. I haven't changed anything overnight, so it appears that there was some kind of temporary glitch, but I can't understand what would have caused it on the network.

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  • Unable to connect via NetBIOS Name

    - by grom
    I can't connect to machines/shares by NetBIOS names. Below is console output showing the problem. C:\>nbtstat -n Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] NetBIOS Local Name Table Name Type Status --------------------------------------------- BEAST <00> UNIQUE Registered WORKGROUP <00> GROUP Registered BEAST <20> UNIQUE Registered WORKGROUP <1E> GROUP Registered WORKGROUP <1D> UNIQUE Registered ..__MSBROWSE__.<01> GROUP Registered C:\>nbtstat -A 192.168.1.3 Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] NetBIOS Remote Machine Name Table Name Type Status --------------------------------------------- BRCLAPTOP <00> UNIQUE Registered WORKGROUP <00> GROUP Registered BRCLAPTOP <20> UNIQUE Registered WORKGROUP <1E> GROUP Registered MAC Address = 00-1C-BF-14-B8-6E C:\>ping beast Pinging beast [fe80::59b8:179f:b90b:a63f%11] with 32 bytes of data: Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Reply from fe80::59b8:179f:b90b:a63f%11: time<1ms Ping statistics for fe80::59b8:179f:b90b:a63f%11: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms C:\>ping brclaptop Ping request could not find host brclaptop. Please check the name and try again. C:\>nbtstat -a brclaptop Local Area Connection: Node IpAddress: [192.168.1.100] Scope Id: [] Host not found.

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  • How can I setup OpenVPN with IPv4 and IPv6 using a tap device?

    - by Lekensteyn
    I've managed to setup OpenVPN for full IPv4 connectivity using tap0. Now I want to do the same for IPv6. Addresses and network setup (note that my real prefix is replaced by 2001:db8): 2001:db8::100:0:0/96 my assigned IPv6 range 2001:db8::100:abc:0/112 OpenVPN IPv6 range 2001:db8::100:abc:1 tap0 (on server) (set as gateway on client) 2001:db8::100:abc:2 tap0 (on client) 2001:db8::1:2:3:4 gateway for server Home laptop (tap0: 2001:db8::100:abc:2/112 gateway 2001:db8::100:abc:1/112) | | | (running Kubuntu 10.10; OpenVPN 2.1.0-3ubuntu1) | wifi | | router | | OpenVPN INTERNET | eth0 | /tap0 VPS (eth0:2001:db8::1:2:3:4/64 gateway 2001:db8::1) (tap0: 2001:db8::100:abc:1/112) (running Debian 6; OpenVPN 2.1.3-2) The server has both native IPv4 and IPv6 connectivity, the client has only IPv4. I can ping6 to and from my server over OpenVPN, but not to other machines (for example, ipv6.google.com). net.ipv6.conf.all.forwarding is set to 1, I've tried disabling net.ipv6.conf.all.accept_ra as well, without luck. Using tcpdump on both the server and client, I can see that packets are actually transferred over tap0 to eth0. The router (2001:db8::1) send a neighbor solicitation for the client (2001:db8::100:abc:2) to eth0 after it receives the ICMP6 echo-request. The server does not respond to that solicitation, which causes the ICMP6 echo-request not be routed to the destination. How can I make this IPv6 connection work?

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  • Not able to access Silverlight.net and ONLY Silverlight.net - All other domains work!

    - by Sootah
    Alrighty folks, I have an extremely odd problem. I am able to surf the web fine with one odd (and really annoying at the moment) exception: Microsoft's Silverlight.net. Every other site that I go to works just fine. This is quite frustrating because I'm in the middle of programming a web app in Silverlight 4.0, and whenever I do a search for any code examples, tutorials, or whatnot at least 50% of the results are hosted in the silverlight.net forums. The error message that I get is: Oops! Google Chrome could not find www.silverlight.net It doesn't work in my other browsers either (both IE and FireFox). What's odd, is that while the error message would lead me to assume it's a DNS error, I can ping the URL just fine. C:\Users\The Doot>ping silverlight.net Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Ping statistics for 206.72.125.201: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 103ms, Maximum = 110ms, Average = 106ms I've checked my HOSTS file, and there's nothing that refers to ANY Microsoft URL in there. What could be causing this!?? More importantly, how do I fix it? Just for kicks, I've even included the results of a traceroute here for your enjoyment. OS: Windows 7 Ultimate Thanks in advance! -Sootah

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  • How can I make IPv6 on OpenVPN work using a tap device?

    - by Lekensteyn
    I've managed to setup OpenVPN for full IPv4 connectivity using tap0. Now I want to do the same for IPv6. Addresses and network setup (note that my real prefix is replaced by 2001:db8): 2001:db8::100:0:0/96 my assigned IPv6 range 2001:db8::100:abc:0/112 OpenVPN IPv6 range 2001:db8::100:abc:1 tap0 server side (set as gateway on client) 2001:db8::100:abc:2 tap0 client side 2001:db8::1:2:3:4 gateway for server Home laptop (tap0: 2001:db8::100:abc:2/112 gateway 2001:db8::100:abc:1/112) | | | (running Kubuntu 10.10; OpenVPN 2.1.0-3ubuntu1) | wifi | | router | | OpenVPN INTERNET | eth0 | /tap0 VPS (eth0:2001:db8::1:2:3:4/64 gateway 2001:db8::1) (tap0: 2001:db8::100:abc:1/112) (running Debian 6; OpenVPN 2.1.3-2) The server has both native IPv4 and IPv6 connectivity, the client has only IPv4. I can ping6 to and from my server over OpenVPN, but not to other machines (for example, ipv6.google.com). Using tcpdump on both the server and client, I can see that packets are actually transferred over tap0 to eth0. The router (2001:db8::1) send a neighbor solicitation for the client (2001:db8::100:abc:2) to eth0 after it receives the ICMP6 echo-request. The server does not respond to that solicitation, which causes the ICMP6 echo-request not be routed to the destination. How can I make this IPv6 connection work?

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  • tc u32 --- how to match L2 protocols in recent kernels?

    - by brownian
    I have a nice shaper, with hashed filtering, built at a linux bridge. In short, br0 connects external and internal physical interfaces, VLAN tagged packets are bridged "transparently" (I mean, no VLAN interfaces are there). Now, different kernels do it differently. I can be wrong with exact kernel verions ranges, please forgive me. Thanks. 2.6.26 So, in debian, 2.6.26 and up (up to 2.6.32, I believe) --- this works: tc filter add dev internal protocol 802.1q parent 1:0 prio 100 \ u32 ht 1:64 match ip dst 192.168.1.100 flowid 1:200 Here, "kernel" matches two bytes in "protocol" field with 0x8100, but counts the beginning of ip packet as a "zero position" (sorry for my English, if I'm a bit unclear). 2.6.32 Again, in debian (I've not built vanilla kernel), 2.6.32-5 --- this works: tc filter add dev internal protocol 802.1q parent 1:0 prio 100 \ u32 ht 1:64 match ip dst 192.168.1.100 at 20 flowid 1:200 Here, "kernel" matches the same for protocol, but counts offset from the beginning of this protocol's header --- I have to add 4 bytes to offset (20, not 16 for dst address). It's ok, seems more logical, as for me. 3.2.11, the latest stable now This works --- as if there is no 802.1q tag at all: tc filter add dev internal protocol ip parent 1:0 prio 100 \ u32 ht 1:64 match ip dst 192.168.1.100 flowid 1:200 The problem is that I couldn't find a way to match 802.1q tag so far. Matching 802.1q tag at past I could do this before as follows: tc filter add dev internal protocol 802.1q parent 1:0 prio 100 \ u32 match u16 0x0ed8 0x0fff at -4 flowid 1:300 Now I'm unable to match 802.1q tag with at 0, at -2, at -4, at -6 or like that. The main issue that I have zero hits count --- this filter is not being checked at all, "wrong protocol", in other words. Please, anyone, help me :-) Thanks!

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  • Wake on Lan Remote not waking PC while the PC does receive the packet.

    - by Nycrea
    Over the last couple of weeks, I have been trying to set up WOL from a remote location. When I use my laptop to wake the machine locally, it works just fine. (for some reason, when I try to wake from my phone with an app called "WOL wake on lan" it does not work locally either, but I'll get to that later) Anyway, when the machine is turned on, and I let it 'listen' for incoming magic packets (with a program called "WOL magic packet sender") on my specified port, it does receive them, though when turned off, the machine does not wake. When sending from phone, either locally or via 3G remotely, it does receive but does not wake as well. Because the machine does receive them when turned on and listening, but does not wake when turned off, I am convinced the cause of the problem is my receiving PC, rather than the router or the sender. Some extra info: The receiving machine is a PC running Windows 7 64bit. My router is the Netgear JWNR2000v2. I have the port I use forwarded to my PC's static IP in the router. If anyone could help, or just share your own story with the same problem, maybe we can work this out. Thanks a lot in advance.

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  • Puzzling TCP performance over 3G / UMTS

    - by lemonsqueeze
    I'm using 3G as my primary internet connection, and TCP over this thing is getting more puzzling every day. For example: Downloading from kernel.org is crazy fast: $wget http://www.kernel.org/pub/linux/kernel/v3.0/linux-3.6.8.tar.bz2 increases to ~500kB/s after a few secs ! Some servers are incredibly slow, for instance www.graphic-pc.com:Same thing, downloading a big file with wget it starts at ~30kB/s for a split second, then collapses to 5-10k or even worse. Web browsing is decent but somewhat unreliable. Randomly, a page will take really long to load or even fail to load, but a reload can succeed almost immediately. Now, by chance i started playing with OpenVPN over UDP on top of the 3G connection, and OMG suddenly everything's extremely fast !Same www.graphic-pc.com now shoots at 100-200kB/s ! What's going on here ??? How come it is so much better with the VPN than without ?? And why does graphic-pc.com crawl when kernel.org flies ?Something to do with my tcp stack (or the server), or some buggy router in between ?? Notes: Setup is laptop running Ubuntu Lucid and a Huawei 3G dongle (So direct pppd connection). I can reproduce this pretty much any time during the day and I'm not moving, so it's clearly not cell environment or internet congestion. (although kernel.org without VPN sometimes does worse in the evening, 60kB or so - but still 500kB with VPN !) For 2) wireshark shows retransmitted packets, dup ack's, even out of order sometimes. I've tried playing with different /proc/sys/net/ipv4 parameters (tcp_rmem, window_scaling, tcp_congestion...) doesn't seem to make a difference. Update: Tried under windows 7 (no VPN) with some interesting results: tcp settings : default tcp_optimizer kernel.org : 10 kB/s 20 kB/s graphic-pc.com: 8 kB/s 70 kB/s ! tcp_optimizer turned on ctcp among other things. Have to check what os graphic-pc.com is running, my bet is linux's tcp_westwood and ms ctcp don't mix well here...

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  • Access server using IP on another interface

    - by Markos
    I am using Windows Server 2012 instead of a router for my home network. Currently I am using RRAS and computers from local network can access Internet correctly. Here is a map of the current setup: [PC1] ---| |---- (lan ip)[Server](wan ip)--> internet [PC2] ---| I have applications running on Server, such as IIS and others. All can be accessed from internet using wan ip and from lan using lan ip. I have a domain, lets say its my-domain.com, which is resolved to my wan ip. What I want is to enable my LAN computers to be able to connect to services on my server using the very same address as internet users: eg http://my-domain.com/. However this does not work for my lan computers. What I understand is that I need to set up some kind of loopback route in a way that packets comming to LAN interface get routed to WAN interface. But I haven't found how to achieve this (in fact, I don't know WHAT to search for). Feel free to ask for additional informations and I will try to update the question.

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  • ping incorrectly pinging 127.0.0.1

    - by AlexW
    I've got an odd DNS issue. I'm running a dual ipv4/ipv6 environment on Linux. Pinging some sites results in ping pinging 127.0.0.1. e.g. #> ping authserver.mojang.com PING authserver.mojang.com (127.0.0.1) 56(84) bytes of data. 64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=1 ttl=64 time=0.045 ms 64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=2 ttl=64 time=0.043 ms 64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=3 ttl=64 time=0.058 ms --- authserver.mojang.com ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2000ms rtt min/avg/max/mdev = 0.043/0.048/0.058/0.010 ms Dig, however correctly returns the following: # dig authserver.mojang.com ; <<>> DiG 9.9.3-P2 <<>> authserver.mojang.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15800 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;authserver.mojang.com. IN A ;; ANSWER SECTION: authserver.mojang.com. 5 IN A 54.235.119.47 ;; Query time: 14 msec ;; SERVER: 2001:4860:4860::8888#53(2001:4860:4860::8888) ;; WHEN: Sat Nov 09 15:34:40 GMT 2013 ;; MSG SIZE rcvd: 66 I'm confused! My web browser returns the correct website, and the same computer booted into Windows also works correctly.

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  • VMWare use of Gratuitous ARP REPLY

    - by trs80
    I have an ESXi cluster that hosts several Windows Server VMs and around 30 Windows workstation VMs. Packet captures show a high number of ARP replies of the form: -sender_ip: VM IP -sender_mac: VM virtual MAC -target_ip: 0.0.0.0 -target_mac: Switch interface MAC The specific addresses aren't really a concern -- they're all legitimate and we're not having any problems with communications (most of the questions surrounding GARP and VMWare have to do with ping issues, a problem we don't have). I'm looking for an explanation of the traffic pattern in an environment that functions as expected. So the question is why would I see a high number of unsolicited ARP replies? Is this a mechanism VMWare uses for some purpose? What is it? Is there an alternative? EDIT: Quick diagram: [esxi]--[switch vlan]--[inline IDS]--[fw]--(rest of network) The IDS is complaining about these unsolicited ARPs. Several IDS vendors trigger on ARP replies without a prior request, or for ARP replies that have a target IP of 0.0.0.0. The target MAC in these replies is the VLAN interface on the switch. Capture points: -The IDS grabs the offending packets -The FW can see the same ones -A VM on the ESXi host does not see these, although there is an ARP request for a specific IP on the ESXi host that has source_ip=0.0.0.0 and source_mac=[switch vlan interface]. I can't share the captures, unfortunately. Really I'm interested in finding out if this is normal for an ESXi deployment.

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  • Measure Upload Speed between a client and our server

    - by tresstylez
    We host a SAAS application specially customized for multiple clients. For one customer in particular -- they are reporting sporadic performance issues from various locations on their network, in particular UPLOADING documents through a form on our website. The client claims they have "bandwidth to spare" and that utilization of their "pipe" is so low that it MUST be our application, but our application has MANY clients and all features are working fine for all other clients. Interestingly enough -- DOWNLOADS (ie. just accessing the website, or downloading documents) is working fine. Speed test shows that they should get 1.2Mbps UP. So, a 3MB file should take 20 secs to upload. It takes 60+ seconds on their network. Sometimes even small files take OVER 10 minutes to upload or they timeout. Pings and Traceroutes don't show any abnormally long hops or response times. They claim other SAAS applications they use allow them to upload just fine. Both IT teams are working together to resolve this issue. What kind of data can I request from the clients to begin ruling things out. Seems like we need to somehow measure LATENCY of the networks involved or even at the switch level, we need to understand if packets are getting dropped somewhere and why. Where should I start? Any help is appreciated. I'll provide more info upon requests

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  • Dual DC Time Service

    - by poconnor
    I believe I'm having an issue with my Domain Controllers and Time Server. On my back up DC, I keep seeing a warning stating "The time service has stopped advertising as a time source because the local clock is not synchronized." Does this mean that my backup DC believes it's a Time Server? My PDC should be the time server and I have gone through setting up the PDC as the time server. I was not around for the original setup of the time server with the old PDC and Backup DC. But I believe the old PDC was the time server so I setup the new PDC as the new time server, when I decommissioned the old PDC. Is it possible that the Backup DC was setup as the time server and it still thinks it's suppose to be giving out time to everyone? Registry for PDC has NTP Registry for Backup has NT5D5 Results of w32tm /monitor Getting AD DC list for default domain... Analyzing:delayoffset from DC1.local..com Stratum: 4 delayoffset from DC1.local..com Stratum: 3 Warning: Reverse name resolution is best effort. It may not be correct since RefID field in time packets differs across NTP implementations and may not be using IP addresses. DC2.local..com[192.168.1.8:123]: ICMP: 1ms NTP: -0.6349491s RefID: DC1.local..com [192.168.1.9] DC1.local..com *** PDC ***[192.168.1.9:123]: ICMP: 0ms NTP: +0.0000000s RefID: wwwco1test12.microsoft.com [65.55.21.20]

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  • Xen virtual host can reach some sites but not others

    - by Tun H S Lee
    Okay, this is killing me. Debian Squeeze, Xen 4.0, brand new install. No iptables rules whatsoever except for the ones added by the default xen bridge script. Dom0 can reach the entire world, no problems. DomU can receive packets from some hosts, but not from others. For instance, if I ping Host A, it works fine. If I ping Host B, the DomU reports 100% packet loss. The hosts are random, but consistent (even after reboots). I can see no pattern to why some work and others don't. In fact, in some cases, different virtual hosts on the same server (an other server at a different data center) are divided; some work and others do not. I can reboot (DomU or Dom0 too) and the same hosts will work or fail as before. If I tcpdump on the Host B while pinging from the DomU, everything looks fine. It sees the echo request coming in and says it's sending one back. However, if I tcpdump peth0 on the Dom0, it never sees the echo reply. Any ideas what could be happening? I'm tearing my hair out here.

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