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• Which network management system (NMS) to choose?

  - by QrystaL

  I need to integrate NMS in large enterprise system for data collection purposes. Primary requirements: collection by SNMP great scalability (up to 1,000 devices with 1,000 interfaces each) failover data storage in Oracle DBMS integration API (configuration, data access) Any ideas would be appreciated...

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• Linux - real-world hardware RAID controller tuning (scsi and cciss)

  - by ewwhite

  Most of the Linux systems I manage feature hardware RAID controllers (mostly HP Smart Array). They're all running RHEL or CentOS. I'm looking for real-world tunables to help optimize performance for setups that incorporate hardware RAID controllers with SAS disks (Smart Array, Perc, LSI, etc.) and battery-backed or flash-backed cache. Assume RAID 1+0 and multiple spindles (4+ disks). I spend a considerable amount of time tuning Linux network settings for low-latency and financial trading applications. But many of those options are well-documented (changing send/receive buffers, modifying TCP window settings, etc.). What are engineers doing on the storage side? Historically, I've made changes to the I/O scheduling elevator, recently opting for the deadline and noop schedulers to improve performance within my applications. As RHEL versions have progressed, I've also noticed that the compiled-in defaults for SCSI and CCISS block devices have changed as well. This has had an impact on the recommended storage subsystem settings over time. However, it's been awhile since I've seen any clear recommendations. And I know that the OS defaults aren't optimal. For example, it seems that the default read-ahead buffer of 128kb is extremely small for a deployment on server-class hardware. The following articles explore the performance impact of changing read-ahead cache and nr_requests values on the block queues. http://zackreed.me/articles/54-hp-smart-array-p410-controller-tuning http://www.overclock.net/t/515068/tuning-a-hp-smart-array-p400-with-linux-why-tuning-really-matters http://yoshinorimatsunobu.blogspot.com/2009/04/linux-io-scheduler-queue-size-and.html For example, these are suggested changes for an HP Smart Array RAID controller: echo "noop" > /sys/block/cciss\!c0d0/queue/scheduler blockdev --setra 65536 /dev/cciss/c0d0 echo 512 > /sys/block/cciss\!c0d0/queue/nr_requests echo 2048 > /sys/block/cciss\!c0d0/queue/read_ahead_kb What else can be reliably tuned to improve storage performance? I'm specifically looking for sysctl and sysfs options in production scenarios.

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• Right Clicking Network File Very Slow Over VPN

  - by Reafidy

  I am having real troubles with a VPN connection. The VPN connection is not used for a internet connection just for file browsing. File browsing is slow, taking about 3-4 seconds to bring up a list of folders. I can live with this, however the problem is when I right click on a file. Sometimes the right click menu comes up instantly but sometimes it brings up the wait icon for anywhere between 30 seconds to a few minutes before displaying the menu. I ran speedtest.net and the results were: 3.08 Down/0.13 Up (Mbps) 0.13Mbps = 16kbps upload. So I am not experiencing miracles with opening files. A 120kb file can take anywhere from 5 to 30 seconds. Sometimes transfering/opening files happens as expected other times its slow but the real issue is with the right click as mentioned. Anyone have any ideas? Using PPTP Clients are all windows 7 pro

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• Ubuntu Laptop as a wireless hotspot on bridge mode

  - by nixnotwin

  I have a wired router to which my ubuntu laptop connects via ethernet. The wierless NIC of the laptop acts as a wireless hotspot on master mode. I use hostapd fo this. I have bridged eth0 and wlan0, so my wireless clients that connect to my laptop over wifi get ip from the wired router via dhcp, so the devices get registered at the wired router ( and the laptop is just an access point). I use the following commands to get my laptop+accesspoint working: sudo brctl addbr br0 sudo brctl addif br0 eth0 sudo hostapd /etc/hostapd/hostapd.conf & sudo dhclient -d br0 & sudo ifconfig wlan0 192.168.1.15 netmask 255.255.255.0 up sudo brctl addif br0 wlan0 These commands enable me to access internet on my wireless clients and also on the laptop which is acting as wireless accesspoint. But if I reboot the wired router (without rebooting the laptop that is acting as accesspoint), Internet access on the laptop+accesspoint gets lost, but on wireless clients it works fine. Even I have not been able to figure out a command which will reset the laptop interfaces to default settings, so everytime the router reboots, I have to reboot the laptop too to get into default settings so that I can re-enter the above mentioned commands. My first question is How can I have my bridge+accesspoint up and running even-though the router reboots? And is there a command to set the interfaces to a default state? (ifdown -a doesn't work, after issuing the command the bridge still remained).

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• Mac internet problems

  - by Bradley Herman

  Our office is set up with mostly macs (7 of them) but we do have a windows laptop and a windows desktop on the network as well. The network is configured with a modem going into a switch/router throughout the office to the computers, along with a wireless router. Everything runs fine most of the time, but periodically while using the web, certain sites will stop loading and timeout repeatedly. This usually lasts 20 minutes or so and can be incredibly annoying. Resetting the modem/router and/or rebooting the computer never helps. The weirdest part is that in almost every case, the websites are fine on our Windows machines. I frequently use github, google, Stack Overflow, and jQuery reference and I can count on the sites being unavailable to me at least once a day. While I can't get them to load, I can spin my chair around to the windows server behind me and load the sites just fine. Any idea what the hell could be going on here?

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• SSH Tunneling From Mac to Windows Server 2008

  - by 5arx

  I've been using Bitvise Tunnelier for a good few years to get secure access to my home server. This week I've switched to OS X and can't seem to find a nice GUI-based app to allow me to connect SSH/SFTP/Remote Desktop thru an SSH tunnel. Can anyone please advise? I'm not overly keen on the command line... Thanks for reading :-D

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• How to selectively route network traffic through VPN on Mac OS X Leopard?

  - by newtonapple

  I don't want to send all my network traffic down to VPN when I'm connected to my company's network (via VPN) from home. For example, when I'm working from home, I would like to be able to backup my all files to the Time Capsule at home and still be able to access the company's internal network. I'm using Leopard's built-in VPN client. I've tried unchecking "Send all traffic over VPN connection." If I do that I will lose access to my company's internal websites be it via curl or the web browser (though internal IPs are still reachable). It'd be ideal if I can selectively choose a set of IPs or domains to be routed through VPN and keep the rest on my own network. Is this achievable with Leopard's built-in VPN client? If you have any software recommendations, I'd like to hear them as well.

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• 3 Servers, 2 Work Fine, One Has Network Issues

  - by ScaleOvenStove

  i have 3 servers, all relatively the same hardware/config, etc. I run some data pulls on all 3, and on 2 of them, they have 1 nic, and they work fine. On the other , there are 2 nics, and unless they are both plugged in or teamed, the processes time out. Any ideas on why this would be? It doesn't make sense to me, as the other two work fine with 1 nic and don't time out when running the same processes.

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• vconfig created virtual interface and trunking - is the the interface untagged or tagged for that VLAN ID?

  - by kce

  I am trying to setup an additional VLAN on our Debian-based router/firewall (which exists as a virtual machine on Hyper-V), our core switch (an HP Procurve 5406) and a remote HP ProCurve 2610 that is connected via a WAN Transparent Lan Service (TLS) link. Let's work backwards from the network edge: The Debian server has an external connection attached to eth0. The internal interface is eth1, which is connected directly from our Hyper-V host to the 5406. The port that eth1 is attached to is setup as Trk12. The 2610 is attached to Trk9 (which trunks a whole slew of VLANs - Trk9 is our TLS head). I can successfully ping the management IP addresses for my VLAN from both switches but I cannot ping, from either switch, the virtual interface for my new VLAN on the Debian-base router and firewall. The existing VLAN works fine. What gives? The port eth1 is attached to is a trunk, the existing VLAN (ID 98) is untagged on the trunk, the new VLAN (ID 198) is tagged. VLAN 198 is tagged on Trk9 on the 5406 and on the 2610. I can ping the other switch's management IP (10.100.198.2 and 10.100.198.3) from the other respective switch. That leg of the VLAN works - however I cannot communicate with eth1.198's 10.100.198.1. I feel like I'm missing something elementary but what it is remains illusive to me. I suspect the issue is with the vconfig created eth1.198. It should pass the tagged VLAN 198 packets correct? But they cannot seem to get any further than the 5406. Communication on the existing VLAN 98 works fine. From the Debian box: eth1: eth1 Link encap:Ethernet HWaddr 00:15:5d:34:5e:03 inet addr:10.100.0.1 Bcast:10.100.255.255 Mask:255.255.0.0 inet6 addr: fe80::215:5dff:fe34:5e03/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:12179786 errors:0 dropped:0 overruns:0 frame:0 TX packets:20210532 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1586498028 (1.4 GiB) TX bytes:26154226278 (24.3 GiB) Interrupt:9 Base address:0xec00 eth1.198: eth1.198 Link encap:Ethernet HWaddr 00:15:5d:34:5e:03 inet addr:10.100.198.1 Bcast:10.100.198.255 Mask:255.255.255.0 inet6 addr: fe80::215:5dff:fe34:5e03/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1496 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:72 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:3528 (3.4 KiB) # cat /proc/net/vlan/eth1.198: eth1.198 VID: 198 REORDER_HDR: 0 dev->priv_flags: 1 total frames received 0 total bytes received 0 Broadcast/Multicast Rcvd 0 total frames transmitted 72 total bytes transmitted 3528 total headroom inc 0 total encap on xmit 39 Device: eth1 INGRESS priority mappings: 0:0 1:0 2:0 3:0 4:0 5:0 6:0 7:0 EGRESS priority mappings: # ip route 10.100.198.0/24 dev eth1.198 proto kernel scope link src 10.100.198.1 206.174.64.0/20 dev eth0 proto kernel scope link src 206.174.66.14 10.100.0.0/16 dev eth1 proto kernel scope link src 10.100.0.1 default via 206.174.64.1 dev eth0 # iptables -L -v Chain INPUT (policy DROP 6875 packets, 637K bytes) pkts bytes target prot opt in out source destination 41 4320 ACCEPT all -- lo any anywhere anywhere 11481 1560K ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED 107 8058 ACCEPT icmp -- any any anywhere anywhere 0 0 ACCEPT tcp -- eth1 any 10.100.0.0/24 anywhere tcp dpt:ssh 701 317K ACCEPT udp -- eth1 any anywhere anywhere udp dpts:bootps:bootpc Chain FORWARD (policy DROP 1 packets, 40 bytes) pkts bytes target prot opt in out source destination 156K 25M ACCEPT all -- eth1 any anywhere anywhere 215K 248M ACCEPT all -- eth0 eth1 anywhere anywhere state RELATED,ESTABLISHED 0 0 ACCEPT all -- eth1.198 any anywhere anywhere 0 0 ACCEPT all -- eth0 eth1.198 anywhere anywhere state RELATED,ESTABLISHED Chain OUTPUT (policy ACCEPT 13048 packets, 1640K bytes) pkts bytes target prot opt in out source destination From the 5406: # show vlan ports trk12 detail Status and Counters - VLAN Information - for ports Trk12 VLAN ID Name | Status Voice Jumbo Mode ------- -------------------- + ---------- ----- ----- -------- 98 WIFI | Port-based No No Untagged 198 VLAN198 | Port-based No No Tagged

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• Server hard disk read speed and client download speed, is there a connection? [closed]

  - by Mywiki Witwiki

  Ok so a client's download speed is only as fast as a server's upload speed, and vice versa. Based on the answers to this post: Does upload speed depend upon download speed of the server? In other words, the data transfer rate between the two computers is only as fast as the speed of the "bottleneck". Let's pretend the two computers are in two different networks and both have 100Mbps internet connection. Ben wants a copy of a file in Mark's computer hard disk with 30Mbps read speed. Does this mean that Ben can download the file at a speed of around 30Mbps only, despite having an internet connection faster than 30Mbps?

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• Working WCF WebServices with NLB server

  - by gguth

  Im starting the architecture of a new project using WCF, but im not the right person to make some network considerations, so im doing some research but cannot find the answers to these questions: We´ll host the WCF service in a common Windows Service app in 2 servers and we´ll have another server to make the Load-Balancing job using the WNLB. The fact that we are hosting the WCF in a Windows Service app can disturb the NLB job? Before my research i thought the load balancing was tought to configure, but with NLB it seems to be very simple, its really that simple? Note: The binding will be basicHttpBinding

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• Slow download speeds on MacBook Pro

  - by Austin

  Just as the title says, I am getting very low download speeds on my MacBook Pro. I did a speed test at speedtest.net, and am getting 7 MbPS down, .5 up. However, I can only seem to get 270 KB PS max (averaging 100 K), whether on my school's network or on my home network, wired or wireless. I am on Mac OS X 10.5.8, with Google Chrome. My ethernet settings (under System Preferences - Network - Ethernet Connection - Advanced - Ethernet) are set to "Configure Automatically", "Speed: 100TX", "Duplex: full-duplex, flow-control", and "MTU: Standard (1500)". As far as I can tell, there are no throttles or anything between here and the ISP, so... Any ideas on why I'm getting such low download speeds?

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• Ubuntu with KVM guest VM and broken bridges

  - by MadPsy

  I have an Ubuntu box with a KVM guest VM running. They use bridging so the guest VM attaches to the physical network of its host. The guest VM has 2 NICs in 2 different bridges. First NIC of the VM is tap5 and is in bridge br0 br0 8000.46720f5c572e no eth0.500 tap5 Second NIC of the VM is tap2 and is in bridge br100 br100 8000.76ad2fc96661 no eth0.100 eth0.101 eth0.103 eth0.104 eth0.105 tap2 On the host, br0 has an IP and br100 does not 21: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP link/ether 46:72:0f:5c:57:2e brd ff:ff:ff:ff:ff:ff inet 192.168.100.4/24 brd 192.168.10.255 scope global br0 inet6 fe80::d6ae:52ff:febe:777/64 scope link valid_lft forever preferred_lft forever On the guest, its eth0 and eth1 interfaces both have IP addresses 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:3e:61:fb:7a:da brd ff:ff:ff:ff:ff:ff inet 192.168.100.6/24 brd 192.168.100.255 scope global eth0 inet6 fe80::23e:61ff:fefb:7ada/64 scope link valid_lft forever preferred_lft forever 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:3e:61:fb:7a:ea brd ff:ff:ff:ff:ff:ff inet 172.16.50.129/25 brd 172.16.50.255 scope global eth1 inet6 fe80::23e:61ff:fefb:7aea/64 scope link valid_lft forever preferred_lft forever On the guest VM, a tcpdump of its eth1 interface (tap2) shows traffic from its eth0 interface (tap5), as if the 2 bridges are themselves bridged. This means any interface on br100 is now bridged across to br0 - which is completely broken. root@chillispot:~# tcpdump -c 1 -n -v -i eth1 net 192.168.100.0/24 tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes 16:31:24.175583 IP (tos 0x0, ttl 64, id 48054, offset 0, flags [DF], proto TCP (6), length 148) 192.168.100.6.22 > 192.168.100.4.59505: Flags [P.], cksum 0x6c2b (correct), seq 1056321648:1056321744, ack 398642983, win 1700, options [nop,nop,TS val 197473436 ecr 200655363], length 96 What could be bridging the 2 bridges, except the guest VM (which is a stock Ubuntu install)? I am at a complete loss! Thanks.

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• arp -n responds with (incomplete) on the wrong subnet, can't remove it

  - by Hannes

  context There are 2 servers: server1 - eth0 10.129.76.16 eth0.2 192.168.0.103 server2 - eth0 10.129.79.1 eth0.2 192.168.62.101 The 192.x.x.x addresses are connected to the same vlan (vlan2) and are able to see eachother. The 10.x.x.x addresses are connected to different vlan's which are not able to see eachother. on request of David Swartz: the routing table on server 1 is: ~$ sudo route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.129.76.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.0.0 0.0.0.0 255.255.192.0 U 0 0 0 eth0.2 0.0.0.0 192.168.61.254 0.0.0.0 UG 100 0 0 eth0.2 the routing table on server 2 is: ~$ sudo route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 <public IP gw> 0.0.0.0 UG 100 0 0 eth0.11 10.129.79.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 <public IP> 0.0.0.0 255.255.255.128 U 0 0 0 eth0.11 192.168.0.0 0.0.0.0 255.255.192.0 U 0 0 0 eth0.2 Problem: When I ping from server 1 to server 2, it seems no packets are arriving and vice versa. When I check the routes (route -n) I see the default gw uses eth0.2 on both servers. But when I use arping, I get a response one way (from server 2 to server 1) but no response vice versa. arping 192.168.62.101 ARPING 192.168.62.101 from 10.129.76.16 eth0 ^CSent 2 probes (2 broadcast(s)) Received 0 response(s) As you can see it uses the 10.x.x.x address instead of the 192.x.x.x. And as I told before, the 10.x.x.x address is unreachable from the other server. When I force arping to use eth0.2, it does work. I don't have any problems with ping'ing other servers from any of those 2 servers. I did see this in the arp tables: ~# arp -n | grep 192.168.0.103 192.168.0.103 (incomplete) eth0 and ~# arp -n | grep 192.168.62.101 Question quite obvious... How can I make these servers see each other again? Things I've tied clear the apropriate entries in the arptable and tried to get rid of the (incomplete) But I think the biggest problem is that eth0 is used instead of eth0.2 for the packets from server 1 to server 2 Because of David Swartz' remark about the routing tables, I added a route in there defining the host. I added 192.168.0.103 0.0.0.0 255.255.255.255 UH 0 0 0 eth0.2 and 192.168.62.101 0.0.0.0 255.255.255.255 UH 0 0 0 eth0.2 to the appropriate servers but this didn't solve the problem so I presume the problem is not in the routing. My guess I guess the problem lies in the following. ~$ arp -n | grep 192.168.0.103 192.168.0.103 (incomplete) eth0 but I'm unable to remove this entry. (arp -d 192.168.0.103 has no effect) Thanks for reading and even more thanks for answering!

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• finding the best network latency between two countries

  - by Yoav Aner

  I know there are many tools to test for bandwidth and latency, but they all rely on having at least one host from which you can run those tests. I wonder whether there's an online source or some other way to guestimate the latency or speed between two countries (in general). For example, would a customer in Japan get lower latency if the server is located in Singapore or Australia? Is a user in India likely to get higher download speed from a server in the UK or in the US? Are there any online resources or some clever ways to answer those questions with a reasonable degree of accuracy? [UPDATE]: Thanks for the great suggestions from Raffael Luthiger. I didn't know about those looking glass servers. The submarine cable maps were also really cool to discover (Thanks to Jesper Mortensen). Also seems really wise if I could ask those network professional in the area for their experience, but obviously I don't have access to those. At least some of them are on SF :) However, I'm still a little unsure how to combine those resources to give me some measurements. This is the information I have: Two countries (A,B). I do have IP addresses of customers in country A (I can obtain those from the web server log files for example). Presumably I can find some looking glass servers in country B and run a trace to those IPs. What's the best measurements to use? Are there any scripts that help automate at least some of this process?

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• VPN still working after rebooting without client - DrayTek client shows "No Connection"

  - by HeavenCore

  My home network is a simple router + pc's setup, nothing fancy - the router has DHCP enabled for 192.168.0.X (255.255.255.0) and my PC picks up the address 192.168.0.82. There are no devices on my local lan in the 192.168.1.x range. On my pc i have the DrayTek VPN client, and a company i do some work for has a DrayTek Vigor router. The VPN client establishes a VPN to that remote company using an IPSec Tunnel (PreShared Key - no encryption) Last night i shut down my pc with the VPN tunnel still connected, when i turned my computer on this morning i accidentally clicked an RDP shortcut to 192.168.1.2 (a host in the remote company) and to my amazement it connected?!? I checked and the DrayTek VPN client isnt running, and when i did run it, it clearly shows "Status: No connection". confused as to how my machine can still talk to this remote machine i tried a trace: C:\Users\HeavenCore>tracert 192.168.1.2 Tracing route to C4SERVERII [192.168.1.2] over a maximum of 30 hops: 1 * * * Request timed out. 2 * * * Request timed out. 3 * * * Request timed out. 4 * * * Request timed out. 5 * * * Request timed out. 6 * * * Request timed out. 7 * * * Request timed out. 8 * * * Request timed out. 9 * * * Request timed out. 10 * * * Request timed out. 11 * * * Request timed out. 12 15 ms 21 ms 32 ms C4SERVERII [192.168.1.2] Trace complete. No indication there as to how it's getting from my network to the remote host. with my network mask being 255.255.255.0 with ip 192.168.0.1 i dont even see how packets are routing to 192.168.1.1 - unless there was a static route in place, so i checked the route table: IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.0.1 192.168.0.82 266 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 192.168.0.0 255.255.255.0 On-link 192.168.0.82 266 192.168.0.82 255.255.255.255 On-link 192.168.0.82 266 192.168.0.255 255.255.255.255 On-link 192.168.0.82 266 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 192.168.0.82 266 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 192.168.0.82 266 =========================================================================== Persistent Routes: Network Address Netmask Gateway Address Metric 0.0.0.0 0.0.0.0 192.168.0.1 Default =========================================================================== As far as i can see, nothing indicating how my packets are getting to 192.168.1.2??? To confirm i was on a different subnet i did an ipconfig /all: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Marvell Yukon 88E8056 PCI-E Gigabit Ether net Controller Physical Address. . . . . . . . . : 00-23-54-F3-4E-BA DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv4 Address. . . . . . . . . . . : 192.168.0.82(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.0.1 DNS Servers . . . . . . . . . . . : 192.168.0.1 208.67.222.222 NetBIOS over Tcpip. . . . . . . . : Enabled Yet straight after confirming my ip and subnet as above i can go ahead and ping the remote machine: C:\Users\HeavenCore>ping 192.168.1.2 Pinging 192.168.1.2 with 32 bytes of data: Reply from 192.168.1.2: bytes=32 time=48ms TTL=127 Reply from 192.168.1.2: bytes=32 time=23ms TTL=127 Reply from 192.168.1.2: bytes=32 time=103ms TTL=127 Reply from 192.168.1.2: bytes=32 time=25ms TTL=127 Ping statistics for 192.168.1.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 23ms, Maximum = 103ms, Average = 49ms Also, note on the ping how the times are 35ms ish, this clearly shows the pings are to the remote host and not something on my local lan (all stuff on my local lan pings in 0ms) - plus i verified the host was actually the host via RDP. My Question: Can an IPSec tunnel stay up some how after a reboot without use of the VPN client? (well, i can clearly see that it can) - where in windows is there visibility of this? how does my machine know where to route the packets? I appreciate any insights & thoughts!

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• Which ports to open on host firewall so that network printing and scanning works?

  - by George Pligor

  I have a multi-functional machine which is both a laser printer and a scanner (Samsung SC-4705ND) I am not able to make the scanner work with the (software) firewall installed in my computer turned on. Operating system is ubuntu 12.04 with regular firewall. if firewall is turned off then everything works as expected I run nmap to discover open services on the samsung machine and I opened all these ports: 80, 427, 515, 631, 5200, 9100, 10001 but with not luck.. How should I configure firewall?

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• Encrypt LAN and wifi traffic on small private network

  - by Grimlockz

  I need some advice about encrypt all traffic on a small private network running wi-fi and LAN traffic on 192.168.0.x network. The network would comprise of client laptops connecting to the wi-fi router (192.168.0.254) via ethernet connection or wireless. The main purpose of the server is for the client laptops to talk to two servers on different IP's (192.168.0.200 and 192.168.0.201) on ports 80 and 433. My main concern is having packet sniffers and what not getting access to the data. The only ways I see at the moment is to have VPN running on the network or use IPSec policy's to do this. Any other ways guys?

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• Crossover cable in addition to normal network connection on servers?

  - by Zero0ne

  I have 2 servers, both with Windows 2003 R2 Each have 2 NIC ports that are 10/100/1000 They are both connected to our LAN + joined to the domain (1 NIC port free on each server) The problem is that our main router is only 10/100 on the ports that these servers are connected to. Since one server is going to host SQL 2005 and the other will be running Altiris NS7, I was hoping that I could use a crossover cable to connect the two directly, thus taking advantage of their 1gbps NIC cards. Is this possible? If so what steps do I need to take to accomplish this? What needs to be done to make sure that when the app server is communicating with the SQL server that it is using the direct link vs traversing the LAN? Thanks a lot!

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• How can non-admins view which files are open on a file server?

  - by Josh

  I'm on a windows workstation, and I want a list of which files are open over the network on a windows server. The Shared Folders MMC Snap-in does this visually, and SysInternals' PSFile does it from the command line, but by default only for admins. I want to let regular users do this, too. What permissions do I need to grant them?

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• Wireless vs. Wired: which is faster?

  - by studiohack

  I have the option of hooking up my machines to the internet either wirelessly or via ethernet cable (wired). I'm curious as to which is faster; the approximate wireless signal strength (average) is about 60%. My question is, would my internet be faster if I used ethernet, resulting in a stronger connection?

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• hardware addressing and configurable addressing scheme

  - by Zia ur Rahman

  basically i want to ask question about configurable addressing scheme for LAN interface hardware. i have read about it from a book, some main points are given by a configurable addressing scheme provides a mechanism that a customer can use to set a physical address.The mechanism can be manual (the switches that must be set when the interface is first installed).or an electronic memory such as an EPROM that can be downloded from the computer(what does this means). Most hardware needs to be configured only once- configuration is usually done when the hardware is first installed. Question:Suppose a network administrator configures the LAN interface hardware (assigns the address) when he installs it. Now later on if he needs to change the physical address of the device can he change it? Or in this addressing scheme the hardware can only be configured once and we can not reconfigure it later on.

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• How to I sync my windows mobile phone via wireless network

  - by Kibbee

  According to this article, I should be able to sync my Windows Mobile smartphone via my wireless internet connection. However, when I go to the connection settings, I only see USB and COM1 options. No option for ethernet. I have an HTC Maple (aka Snap), and it connects fine to my home wireless network, but I would like to be able to sync over the network.

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• Get OWA and ActiveSync working on server using HTTP redirect in IIS 7

  - by eric

  We have two servers on our LAN. One is a Windows 2003 Server domain controller running Exchange 2003. The other is a stand-alone Windows 2008 server running IIS 7. Our company website runs on the IIS 7 (2008) server, so the firewall forwards port 80 to this. How can I get OWA and ActiveSync to work with this setup? And without using SSL. I have tried setting up a website on the IIS 7 box (mail.ourdomain.com) and using HTTP redirect to point to http://mailserver/exchange, but this doesn't work. Do we have to purchase an SSL certificate for this to work?

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• Always use one slow connection in preference of a "faster" one

  - by billc.cn

  In Windows, there's this automatic metric thing where the metric is selected according to the declared speed of the link. I now have a gigabit LAN routed to a 2MB DSL service and a HSDPA mobile broadband connection. The former is always chosen for Internet packets even though the latter is actually faster. I tried setting the mobile broadband's interface metric to 1 and raising its priority in the advanced settings of the adapter settings, but this does not seem to affect the metric of the default route. The default route to the Ethernet interface always have a lower metric than the mobile broadband interface. Am I missing something here?

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