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• Dynamic DNS with Comcast

  - by colithium

  I've just recently moved across town. Previously, I had Dynamic DNS set up so I could remotely connect to my desktop (primarily to use TightVNC). My ISP was Comcast and I'm in the Denver, Colorado area. Currently, I'm still with Comcast and still in Denver. My router connects to the internet just fine and my Dynamic DNS record over at DynDNS did get updated with my router's current external IP address. So my router, DynDNS, and public DNS records all agree what my IP address is. However, I can't actually connect to anything from the outside world. My trace route to Google looks something like: Tracing route to google.com [74.125.19.147] 1 3 ms 1 ms 1 ms 192.168.1.1 (this is the internal IP address of my router) 2 * * * Request timed out. 3 9 ms 8 ms 10 ms te-8-2-ur02.wheatridge.co.denver.comcast.net [68.85.221.177] 4 12 ms 12 ms 19 ms te-0-8-0-2-ar02.aurora.co.denver.comcast.net [68.86.103.97] 5 16 ms 13 ms 11 ms pos-0-3-0-0-cr01.denver.co.ibone.comcast.net [68.86.91.1] 6 28 ms 28 ms 27 ms pos-0-9-0-0-cr01.dallas.tx.ibone.comcast.net [68.86.85.174] 7 29 ms 27 ms 28 ms pos-0-1-0-0-pe01.1950stemmons.tx.ibone.comcast.net [68.86.86.94] 8 66 ms 108 ms * 75.149.231.70 9 65 ms 68 ms 93 ms 72.14.233.77 10 67 ms 66 ms 66 ms 72.14.233.111 11 67 ms 67 ms 69 ms 216.239.43.144 12 68 ms 71 ms 73 ms 209.85.249.30 13 66 ms 66 ms 68 ms nuq04s01-in-f147.1e100.net [74.125.19.147] This is what the trace route looks like from an outside source to my DynDNS domain name: traceroute to 98.245.67.65 (98.245.67.65) 1 illuminati-130 138.67.130.61 2 138.67.63.253 138.67.63.253 3 vermiculite 138.67.253.20 4 csm-ct-gw 138.67.253.244 5 138.67.253.2 138.67.253.2 6 ge-7-24-ar01.denver.co.denver.comcast.net 68.86.128.17 7 te-0-4-0-0-ar02.denver.co.denver.comcast.net 68.86.179.21 8 te-9-3-ur01.wheatridge.co.denver.comcast.net 68.86.103.18 9 * * * {Times Out} Now my guess is, whatever is sitting just beyond my router (what the modem connects to) is gumming things up. Even though the routes aren't EXACTLY the same, that appears to be the spot that the trace route either stops or doesn't get a response. My question is, for Comcast networks (particularly in Denver), what would be the device that typically sits there? Is there anything I can do about it? That device seems to not respond to PING but does forward it along when I'm going outwards. But it looks like it eats it when the request is coming in. It's hard to prove that from these logs but I'm assuming that's the case because my router used to accept connections from the outside and I haven't changed anything on it.

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• Centralised configuration management for basic linksys routers?

  - by Otaku Coder

  Does anyone know if its possible to install a custom router firmware, such as dd-wrt and then use a central config management tool to push/pull changes? The setup here involves each office having their own router, and as the 'ISP' we need to control/maintain router config. Just wondered if its been done before?

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• Isolating VMware virtual machines from the network

  - by jetboy

  I have: VMware Workstation 7 running on a Windows 7 box (with a single NIC), with multiple virtual machines running a range of OSs. The host box is connected to a WRT54G router running Tomato firmware. The router is acting as a wireless bridge to another WRT54G that's wired to my broadband modem. I can access the VMs externally via VNC using VMware's Remote Display. Over time I've had these running: a. Using NAT networking (single IP) with port forwarding on the router and a custom port in VMware for each VM. b. Using bridged networking with static IPs assigned to each VM via MAC address, and port forwarding on the router to each IP running with standard ports. Either way, the host box, and other physical machines on the network are accessible from the VMs. Is there a way to isolate the VMs from the rest of the network, but still maintain internet access and remote VNC to the VMs?

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• Split horizon, route filtering, and having RIPv2 announce a non-attached route to host

  - by Paul

  Routers A, B & C live at 10.1.1.1, 10.1.1.2 and 10.1.1.3 on a /24 metro Ethernet subnet. Each router also has its own private subnet on another interface. Router B's private subnet links thru a firewall to a 10.20.20.0 network at another organization. Router B redistributes to A and C several static routes for hosts on 10.20.20.0. However, a new host 10.20.20.5/32 must be reached via a different path that goes through router C. I know that C can advertise this host-based route with no problem, but I'd like to keep all my 10.20.20.x static routes in one place. So, how can B tell A via RIPv2 to send packets for 10.20.20.5/32 to C? So far it looks like I need no ip split-horizon on router B's 10.1.1.2 interface, perhaps because B has already learned from C other routes with a next hop of 10.1.1.3. But how does RIPv2 split horizon with no auto-summary and network 10.0.0.0 really work? If B learns a route to ANY 10.x.x.x network or host from A or C, is that enough for split horizon to keep it from redistributing ip route 10.20.20.5 255.255.255.255 10.1.1.3? And if I want to suspend split horizon only for this one new host, how do I filter out the mess of regurgitated routes that B advertises when I try no ip split-horizon? Thanks much.

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• Tools to test multicast routing

  - by Zoredache

  I am looking for a good simple tool that runs on a standard OS (Windows or Linux) that I can used to test that multicast is being passed properly by a router. I have been asked by a client to enable multicast routing on a Linux box acting as their router since their phone system requires multicast to for a few features. Since I am not physically near the client I don't really have the ability to experiment with the various methods for setting up multicast routing on Linux. I can setup a router at my desk that is identical to what is deployed on their network, but I don't know of any good simple tools that I can use to generate or listen for multicast traffic. The one mulicast tool I have found is mcast.exe tool which is part of the Windows 2000/2003 resource kit. From what I have read online it seems that mcast.exe does not work across a router, and only works on the local network, so that doesn't seem to be useful for me to test multicast routing. So what do tool(s) do you use to test that multicast routing is properly setup?

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• Multiple public IPs through DD-WRT without 1-to-1 NAT

  - by Stephen Touset

  I've done a search here and wasn't able to find anything relevant to my situation. I apologize in advance if I've missed an existing post on the topic. Our ISP has provided us with 6 static IP addresses. We are currently using two of them (plus one for the Comcast-provided router). One of the static addresses routes to our internal network, and the other goes to our VOIP phone system. Unfortunately, the Comcast machine doesn't support QoS, so our VOIP calls have been choppy. We plan to put the Comcast-provided router into bridge mode and replace it with an ASUS RT-N16 running DD-WRT. However, I'm unsure how to set up DD-WRT to function similarly to our existing Comcast router. The Comcast router's WAN IP is the first of our static IP addresses. We did not need to provide an internal LAN IP address — simply connecting machines that use our other public addresses to the LAN ports on the Comcast router is enough for it to route between the connected machines and our internet connection. Is there a way to do a similar setup through the DD-WRT? Thanks in advance.

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• Is there any reason to subnet a home network?

  - by Will

  For networks I understand we set a netmask on each computer to let it know what IPs it can talk to without going through the router - IPs on the same subnet can talk directly to each other and do not have to go through a router/switch. However, in today's home networks (and I suspect corporate networks as well) every computer is connected to a router/switch (at the low cost of today's hardware I doubt there it much of a market for wired repeaters/hubs). This seems to obviate the need for a subnet mask and subnetting. Considering that in most modern home architectures every computer goes through the router, even to talk to computers on the same network, is there any reason for me to subnet a home network?

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• How to set the preffered network interface in linx

  - by Mike Cooper

  I have my network set up like this. http://docs.google.com/Doc?docid=0AZ1YxuLE4djaZGhqN2s1NmRfMjhjNjc0Ym1meg&hl=en In words: I have a machine (Calcium, running Arch Linux) that has two network interfaces. eth0 is hoooked up to a router, and is gigabit. Eth1 is hooked up directly to the university network over 10Megabit. The router's uplink is hooked up to the university network as well, and it is also 10Megabit. Currently (I believe) all traffic on Calcium is going through eth0, through the router, regardless of whether it is internal or external. (How can I confirm this?) Ideally, traffic that is destined for the internal network (192.168.10.0/24) would travel over eth0 to the router, and wherever it is going. ALL other traffic should go over eth1. I suspect that this behavior could be acheived with IP tables? I don't really know where to start looking to learn that though, so any links would be appreciated.

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• Losing WLAN connections but maintaining internet connections on WIndows 7 Workgroup

  - by Di

  I have 4 computers all running Windows 7 networked in a Work group through Billion 7404vgp-m wireless router.All drivers and firmware for wireless adapters and router are up to date. Windows Firewall and Defender disabled.Disconnected ipv6. Running Nod 32 anti virus software. All have own static IP address 192.XXX.X.XXX. When I Reset the router all computers have Internet and LAN access for about 1 hour and then they will lose the LAN connection but maintain Internet connection. Resetting wireless adapters or restarting computers does nothing to fix this but resetting router will. What is causing this and how do I fix it. Thanks Di

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• correct routing for multiple devices

  - by helmi

  I have Debian Lenny machine with 3 interfaces enabled (eth0-2), and I have problems as follow. eth1 is connected to a router and this router has portforwarding for port80. eth2 is connected direct to the internet If I open a website hosted on my system via the router it works fine. If I try to open the same via the eth2 connetion it does not! tshark shows incomming trafic on eth2 but nothing goes out there. iptabes accepts all My routing table: Ziel Router Genmask Flags Metric Ref Use Iface 10.9.0.2 * 255.255.255.255 UH 0 0 0 tun0 212.236.24.128 * 255.255.255.224 U 0 0 0 eth2 192.168.1.0 * 255.255.255.0 U 0 0 0 eth1 192.168.0.0 * 255.255.255.0 U 0 0 0 eth0 10.9.0.0 10.9.0.2 255.255.255.0 UG 0 0 0 tun0 default 192.168.1.1 0.0.0.0 UG 0 0 0 eth1 default 212.236.024.129 0.0.0.0 UG 0 0 0 eth2 default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0

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• MAC and PC problems on home network

  - by tombull89

  Hello! At home we have a wireless router that my family want to use. We have our main computer physically connected to the router, and my laptop is connected wirelessly. When the network is like this then it is faultless. However, when my brother introduces is Apple MAC into the equation, both my laptop and the family machine gets all sorts of problems, primarily long load times and timeouts. The MAC, however, works fine. I think I've read something here or SF about a MAC continusly pinging a router which times it out, but I've not found any solution so far. Router: Belkin F5D7634uk4A-H Home Computer: XP SP3 My Laptop: Windows 7, Ultimate Mac: 13" Macbook Pro, Snow Lepoard

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• Netgear Wireless-n 150 wrn1000v2

  - by Jordan

  I'm not sure if this is the place to ask this question, move it if it's not. I'm trying to fix a wireless network. It only connects to a few devices and when it does work the connection is spotty. The router is a netgear wireless-n 150 wrn1000v2. Connecting to the router isn't a big problem, but connecting to the internet via WiFi is. I can't upgrade the firmware becuase it is from Comcast and it seems as though they only allow their versions of the firmware. I've monitored the network with wireshark and I see that the devices that are having trouble connecting are constantly asking "who is 192.168.1.1 tell 192.168.1.x" where x is the ip for the device. 192.168.1.1 is the router. This is from running wireshark on the wireless device. What does this mean. At this point I feel like buying a new router is the only option.

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• New CAT5 cable run is unstable - bad jacks? Bad cable?

  - by BeemerGuy

  This is a little project I'm doing at home. I wanted to wire two rooms together (basically, the router is one room, and the switch is in the second room). So I ran a CAT5 between the two rooms, and wired an RJ45 jack in each room. I then hooked up the two jacks with two CAT5 cable to run it through the cable tester, and all 8 wires seem good. Now, when I connect the switch and the router, the connection is unstable -- I ping the router and it barely holds on for two pings before it disconnects, and stays in that unstable state. Just to make sure the router and the switch are ok, I connected them with long wire between the two rooms and the connection is absolutely stable, and pings continuously. What could be the cause for the unstable connection? Especially that it pings a few times, so there IS a connection. But why is it unstable? And how come the cable tester says it's ok, but it's unstable?

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• Split horizon, route filtering, and having RIPv2 announce a non-attached route to host...

  - by Paul

  Routers A, B & C live at 10.1.1.1, 10.1.1.2 and 10.1.1.3 on a /24 metro Ethernet subnet. Each router also has its own private subnet on another interface. Router B's private subnet links thru a firewall to a 10.20.20.0 network at another organization. Router B redistributes to A and C several static routes for hosts on 10.20.20.0. However, a new host 10.20.20.5/32 must be reached via a different path that goes through router C. I know that C can advertise this host-based route with no problem, but I'd like to keep all my 10.20.20.x static routes in one place. So, how can B tell A via RIPv2 to send packets for 10.20.20.5/32 to C? So far it looks like I need no ip split-horizon on router B's 10.1.1.2 interface, perhaps because B has already learned from C other routes with a next hop of 10.1.1.3. But how does RIPv2 split horizon with no auto-summary and network 10.0.0.0 really work? If B learns a route to ANY 10.x.x.x network or host from A or C, is that enough for split horizon to keep it from redistributing ip route 10.20.20.5 255.255.255.255 10.1.1.3? And if I want to suspend split horizon only for this one new host, how do I filter out the mess of regurgitated routes that B advertises when I try no ip split-horizon? Thanks much.

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• Cloudstack virtual machines can't communicate with virtual routers when they are on different hosts

  - by Jorge Suárez de Lis

  I'm using Cloudstack 2.2.14 on a Ubuntu 10.04 set of hosts, and I have a problem on my setup. I have two hosts running. When a virtual router is created on host 1 and a virtual machine using that virtual router is created on host 2, or vice versa, I have no connectivity at all on the virtual machine. First of all, I have to setup the network manually on that virtual machine -usually DHCP is working, but not here-. Then, I can't ping to the virtual router from the virtual machine or vice versa. When both virtual router and virtual machine are created on the same host, everything works! Maybe those packages are being filtered somehow? I have no clue on how to proceed. Both hosts can communicate directly outside the virtualization.

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• How to access remote lan machines through a ipsec / xl2ptd vpn (maybe iptables related)

  - by Simon

  I’m trying to do the setup of a IPSEC / XL2TPD VPN for our office, and I’m having some problems accessing the remote local machines after connecting to the VPN. I can connect, and I can browse Internet sites trough the VPN, but as said, I’m unable to connect or even ping the local ones. My Network setup is something like this: INTERNET eth0 ROUTER / VPN eth2 LAN These are some traceroutes behind the VPN: traceroute to google.com (173.194.78.94), 64 hops max, 52 byte packets 1 192.168.1.80 (192.168.1.80) 74.738 ms 71.476 ms 70.123 ms 2 10.35.192.1 (10.35.192.1) 77.832 ms 77.578 ms 77.865 ms 3 10.47.243.137 (10.47.243.137) 78.837 ms 85.409 ms 76.032 ms 4 10.47.242.129 (10.47.242.129) 78.069 ms 80.054 ms 77.778 ms 5 10.254.4.2 (10.254.4.2) 86.174 ms 10.254.4.6 (10.254.4.6) 85.687 ms 10.254.4.2 (10.254.4.2) 85.664 ms traceroute to 192.168.1.3 (192.168.1.3), 64 hops max, 52 byte packets 1 * * * 2 *traceroute: sendto: No route to host traceroute: wrote 192.168.1.3 52 chars, ret=-1 *traceroute: sendto: Host is down traceroute: wrote 192.168.1.3 52 chars, ret=-1 * traceroute: sendto: Host is down 3 traceroute: wrote 192.168.1.3 52 chars, ret=-1 *traceroute: sendto: Host is down traceroute: wrote 192.168.1.3 52 chars, ret=-1 These are my iptables rules: iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT # allow lan to router traffic iptables -A INPUT -s 192.168.1.0/24 -i eth2 -j ACCEPT # ssh iptables -A INPUT -p tcp --dport ssh -j ACCEPT # vpn iptables -A INPUT -p 50 -j ACCEPT iptables -A INPUT -p ah -j ACCEPT iptables -A INPUT -p udp --dport 500 -j ACCEPT iptables -A INPUT -p udp --dport 4500 -j ACCEPT iptables -A INPUT -p udp --dport 1701 -j ACCEPT # dns iptables -A INPUT -s 192.168.1.0/24 -p tcp --dport 53 -j ACCEPT iptables -A INPUT -s 192.168.1.0/24 -p udp --dport 53 -j ACCEPT iptables -t nat -A POSTROUTING -j MASQUERADE # logging iptables -I INPUT 5 -m limit --limit 1/min -j LOG --log-prefix "iptables denied: " --log-level 7 # block all other traffic iptables -A INPUT -j DROP And here are some firewall log lines: Dec 6 11:11:57 router kernel: [8725820.003323] iptables denied: IN=ppp0 OUT= MAC= SRC=192.168.1.81 DST=192.168.1.3 LEN=60 TOS=0x00 PREC=0x00 TTL=255 ID=62174 PROTO=UDP SPT=61910 DPT=53 LEN=40 Dec 6 11:12:29 router kernel: [8725852.035826] iptables denied: IN=ppp0 OUT= MAC= SRC=192.168.1.81 DST=224.0.0.1 LEN=44 TOS=0x00 PREC=0x00 TTL=1 ID=15344 PROTO=UDP SPT=56329 DPT=8612 LEN=24 Dec 6 11:12:36 router kernel: [8725859.121606] iptables denied: IN=ppp0 OUT= MAC= SRC=192.168.1.81 DST=224.0.0.1 LEN=44 TOS=0x00 PREC=0x00 TTL=1 ID=11767 PROTO=UDP SPT=63962 DPT=8612 LEN=24 Dec 6 11:12:44 router kernel: [8725866.203656] iptables denied: IN=ppp0 OUT= MAC= SRC=192.168.1.81 DST=224.0.0.1 LEN=44 TOS=0x00 PREC=0x00 TTL=1 ID=11679 PROTO=UDP SPT=57101 DPT=8612 LEN=24 Dec 6 11:12:51 router kernel: [8725873.285979] iptables denied: IN=ppp0 OUT= MAC= SRC=192.168.1.81 DST=224.0.0.1 LEN=44 TOS=0x00 PREC=0x00 TTL=1 ID=39165 PROTO=UDP SPT=62625 DPT=8612 LEN=24 I’m pretty sure that the problem should be related with iptables, but after trying a lot of different confs, I was unable to find the right one. Any help will be greetly appreciated ;). Kind regards, Simon. EDIT: This is my route table: default 62.43.193.33.st 0.0.0.0 UG 100 0 0 eth0 62.43.193.32 * 255.255.255.224 U 0 0 0 eth0 192.168.1.0 * 255.255.255.0 U 0 0 0 eth2 192.168.1.81 * 255.255.255.255 UH 0 0 0 ppp0

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• Losing WLAN connections but maintaining internet connections on WIndows 7 Workgroup

  - by Di

  I have 4 computers all running Windows 7 networked in a Work group through Billion 7404vgp-m wireless router.All drivers and firmware for wireless adapters and router are up to date. Windows Firewall and Defender disabled.Disconnected ipv6. Running Nod 32 anti virus software. All have own static IP address 192.XXX.X.XXX. When I Reset the router all computers have Internet and LAN access for about 1 hour and then they will lose the LAN connection but maintain Internet connection. Resetting wireless adapters or restarting computers does nothing to fix this but resetting router will. What is causing this and how do I fix it. Thanks Di

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• change ip address verizon fios [closed]

  - by John Smith

  One well documented way to change a dynamically assigned ip address is to log into the router configuration settings and change the mac address , disconnect the router and modem, and to turn it all back on. This actually worked with a basic modem connected by ethernet directly to a laptop, spoofing laptop mac address, with a cable internet provider. Now this question is specific to fiber optic internet providers who bundle with tv and internet (verizon fios, comcast xfinity). Verizon fios installation comes with an actiontec router, and there is a built in way to clone the mac address in the router configuration settings. What will happen if the mac address changes from what verizon installed it as? Will they get angry and disconnect service? Will other services other than internet stop working (tv or phone)?

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• Installing SDM on a Cisco 2821 ISR

  - by Sam Sanders

  I trying to change the configuration of our router, it's a Cisco 2821 Integrated Services Router. I don't know much about Cisco products. While looking at the PDF manual for the router I notices it talked about SDM Security Device Manager. But when I point my web browser at the IP address of the router, it give me a very simple web interface. It's sort of like a string builder for CLI commands. I'm guessing SDM was not installed on it. So my question how would I go about do that? I found this link (below), but I'm a bit new to networking. So any advice would be welcome. http://www.cisco.com/en/US/docs/routers/access/cisco_router_and_security_device_manager/software/quick/guide/SDMq7.html

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• How to set the preferred network interface in linux

  - by Mike Cooper

  I have my network set up like this. http://docs.google.com/Doc?docid=0AZ1YxuLE4djaZGhqN2s1NmRfMjhjNjc0Ym1meg&hl=en In words: I have a machine (Calcium, running Arch Linux) that has two network interfaces. eth0 is hoooked up to a router, and is gigabit. Eth1 is hooked up directly to the university network over 10Megabit. The router's uplink is hooked up to the university network as well, and it is also 10Megabit. Currently (I believe) all traffic on Calcium is going through eth0, through the router, regardless of whether it is internal or external. (How can I confirm this?) Ideally, traffic that is destined for the internal network (192.168.10.0/24) would travel over eth0 to the router, and wherever it is going. ALL other traffic should go over eth1.

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• 2 HP Procurve 4000M switches and Comcast SMC Gateway

  - by Cole Tierney

  We've got 2 HP Procurve 4000M switches joined by a trunk. Switch 1 is connected to a Cisco 2600 router which is connected to a T1. Internet traffic for hosts on switch 2 must pass through the trunk to switch 1. We're now switching to Comcast who's given us 4 port SMC router. I would like to connect each switch to the comcast router to reduce traffic on the trunk, but I don't want to create a loop. The switches support spanning tree protocol, but I don't know how this would work with the comcast router. Would a triangle network like this work? Thanks for any tips.

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• Correct way to set up office network - 8 workstations, a file server and a staging server

  - by naunu

  Our office had this old school windows 2003 domain setup, our server caught fire, and now we are looking to do it right from scratch. Here is what we need: 5 PC and 3 Mac workstations for web development, they will each have WAMP/MAMP setup on them, managed by their developers. We will have a file server for assets, and a LAMP server with an external IP for staging. Here is what we have to work with: 5 IP addresses, brand new PC file server with windows 2008 SE, D-Link DSS-16+ 16 port switch, belkin 5 port wireless router, cable modem with 4 ports. How I have it set up now (this is a temporary makeshift setup): Cable modem = LAMP server, wireless router Wireless router = Switch = All of the workstations and file server (setup as a workgroup). We have noticed our internet is very slow with us all plugged in to the switch, and the switch plugged in to the router. I am not positive, but I think it is because our router does not have NAT. We are also having problems with the MACs connection to the network drive - it keeps disconnecting. I want this done right, and we have a ~$600 budget to buy anything else we need. Does anybody have any advice for me? Should I set up a domain or workgroup?

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• how to Host website from my home ADSL?

  - by Amr ElGarhy

  I knew that i can use DynDNS to setup a hosting which will access my home adsl for hosting a website. I entered there but couldn't figure out how to setup this in steps, i registered a host name but couldn't link to my router, i feel that there somethings missed. Also i checked this article but it didn't help me because i couldn't find options he is talking about in my router. My router is D-Link wireless. And i have a dynamic IP address

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• how to Host website from my home ADSL?

  - by Amr ElGarhy

  I knew that i can use DynDNS to setup a hosting which will access my home adsl for hosting a website. I entered there but couldn't figure out how to setup this in steps, i registered a host name but couldn't link to my router, i feel that there somethings missed. Also i checked this article but it didn't help me because i couldn't find options he is talking about in my router. My router is D-Link wireless. And i have a dynamic IP address

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• arp requests are sent continuously and my linux machine disconnected to the world

  - by sees

  I have the following problem and really need your help I'm implementing a small server to receive request from client on port 18999(just sample) using TCP socket. When I tested my server by using a lot of requests from a tablet through a router, I got the ARP problem(?) My net work just like: TABLET <------- WIRELESS ROUTER <------- MY SERVER (LINUX) Problems: 1. Can not connect to my Linux any more ( telnet, ping v.v...unreachable) 2. I use serial cable to connect to my Linux machine and use Wiresharp (from Windows) to catch the send message from Linux. It says that Linux keeps sending out continuously every 3 seconds ARP messages like the following: xx:xx:99:77:ff:69 ff:ff:ff:ff:ff:ff ARP 60 Who has 192.168.10.2? Tell 192.168.10.3 In the above message: xx:xx:99:77:ff:69 my Linux MAC address 192.168.10.2 my Tablet address 192.168.10.3 my Linux IP address Can you help me figure out the problem? Or tell me the way to detect the problem and reset the network back to normal (maybe restart Linux but I want to detect problem and restart automatically) UPDATE: 1. The above network works normally if tablet sends messages to my LINUX in normal speed (but also down after 48 hours) 2. The router works again after I unplugged my Linux ethernet cable (RJ45) from router. 3. The wireless network still works ( I can browser the router page from tablet) 4. When I use: ifconfig down then ifconfig up , the Linux restarts (?????????)

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