Reputation
10,921
Top tag
Next privilege 15,000 Rep.
Protect questions
Badges
3 22 49
Newest
 Good Answer
Impact
~1.1m people reached

May
11
comment Is it possible to get a router's public IP address from wireless access points without knowing the keys?
@AthomSfere, the modem I use right now is bridged - most of the modems I have ever used across 3 different states and 8 ISPs, both cable and DSL, were also bridged - it isn't niche, it is a standard practice for many ISPs. The ISP I used to work for used bridged modems for all consumer line products. The business line products (SDSL,IDSL,T1) had routers. Even the EoC bundled service had a bridged connection.
May
11
comment What are the requirements for a “Listen Server” in video games?
Yes, latency is measured by round trip time, so that includes all legs of the journey between both end points.
May
11
comment Wired connection being dropped
If it does that repeatedly then it is a flapping iface. The link down indicates a break on layer 2 which usually is a physical issue - that can be cable, NIC or switch port. Try moving to a different switch port. If the issue continues, try replacing the cable. If that doesn't work, it is probably the NIC.
May
10
comment Wired connection being dropped
"device is not ready" may indicate an issue with the driver talking to the card - maybe a firmware issue on the card? still could be a driver issue as well.
May
10
comment example.com cannot be resolved to an IP Address
At the very least, dig output to the address would help us get started.
May
10
comment What are the requirements for a “Listen Server” in video games?
Bandwidth does matter, but so does the type of connection. For instance, T1 lines typically have lower latency than ADSL lines - and that has a lot to do with protocol, equipment and distance. Another reason is that T1 lines are symmetric whereas ADSL is asymmetric (that is what the A in ADSL stands for) - which means that you can get bottle-necked on either the upstream OR the downstream - just one of the directions being clogged will kill latency on the entire line. All communication over a network (or the internet) is two-way, so you need both sides to be clear.
May
10
comment Wired connection being dropped
that might be a NIC issue, or driver issue. I'd try updating drivers first - you don't have a lot of options on those if it is hardware issue. I've seen issues where a bad cable can have similar symptoms as well.
May
10
comment Difference between WAN IP & LAN IP
If you have a CIDR block, then it is a group of static IPs (look up CIDR on wikipedia for an explanation of what /29 translates out to). They are also public IPs and it is not required that you use them (you can NAT and just use the WAN IP if you desire. However, if you have servers, you can use the LAN IPs and use the gateway provided to route those through the WAN IP.
May
10
comment Difference between WAN IP & LAN IP
It looks like a routed block. You would set up the first block on the router's WAN, the second block could then be used in the LAN with a gateway on the first block. Not entirely sure - but the ISP I used to work for did things like that.
May
9
comment Why does the set command display more environment variables than the environment variables gui?
It is not uncommon on many operating systems to only include common config option in the GUI for standard users and expect that advanced users who would more likely need the less standard options will prefer the command line for their work.
May
9
comment Is it possible to get a router's public IP address from wireless access points without knowing the keys?
@AthomSfere, not entirely correct, modems can be bridged so they simply translate the layer 2 protocol to Ethernet and have nothing to do with the IP layer, which would allow the router to have a public IP.
May
8
comment How do I real-time synchronize two files in Windows 8.1?
Is this simply to have the file available on two separate paths? or to keep a backup that is up to date after every edit?
Apr
28
comment Why is Samba SMB slower than HTTP/NFS/FTP transfer on NAS on my LAN?
He could also test using dd from the Pi to the drive and see if it is just the Pi's ability to read/write on the drive.
Apr
15
comment Does increasing upload or download speed reduce ping?
Outside of saturating your pipe, ping (latency) is typically governed by factors not under your control: the medium of the connection (copper, fiber, etc) as well as type of cable/connection (25 pair, single mode/multimode, wavelength, there are really lots of variations in this category), speed of network equipment you're attached to (DSLAM, CMTS, ATMs, etc), distance between you and this equipment (aka "first mile"), quality of cable within IW (cat5/cat3/cat6), as well as quality of all of this on the end of whatever you're pinging and everything in between.
Mar
26
comment Network kBit/s drops to 0 intermittently
Get a pcap on the server. Look for changes in window size - it sounds like you may be overpowering the server, window size drops to 0 until the server catches up, then window size increases, traffic starts moving again until again, the server gets overpowered and so on.
Mar
26
comment I can't find my modem IP at all
Not all modems have IPs. With DSL, modems can be in "bridged" mode, in which case they simply convert ATM to Ethernet, but do not actually have a network address. If you can log into your router, you can look at the WAN information on the router. If it has a public IP, your modem is bridged. If it has a private IP, then the gateway your router is using is the modem IP.
Mar
26
comment Why does a CPU have a clock?
You'll find a good explanation here on cpu clock speed: en.wikipedia.org/wiki/Clock_rate
Mar
26
comment Unable to SSH to internal IP
If they are on the same network (and I assume they are) and you're not arping, then nothing else past that will work properly. So to start, what are their ifconfig outputs? I'd expect them to show IP/mask as being in the same subnet. Open two terminals on each PC, start a tcpdump using something like tcpdump -i <iface_name> -n "host <other_PC_ip> and (icmp or arp)" on each PC and then in the other window on each PC, ping the other PC. Ensure that 1)each PC is sending out an ARP broadcast asking for the other PC's MAC and 2)see if that broadcast hits the other side.
Mar
26
comment Unable to SSH to internal IP
Do they have appropriate arp entries? Can you ping? can you telnet/netcat on port 22?
Mar
25
revised Path error in script
deleted 58 characters in body; edited title