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May
18
awarded  Notable Question
Nov
12
awarded  Popular Question
Feb
21
awarded  Student
Jan
4
awarded  Scholar
Jan
4
comment Cannot ping over LAN until a ping is received
Machine B is running a program that continually accesses the internet, so I'm assuming it's keeping its NIC awake for that. Machine A doesn't lose its ability to contact B as long as it's accessing the network, so its NIC is probably falling asleep and then the ARP record gets pruned. IOW, point to @ SmirksWhileWalkingWCabaretGirl.
Jan
4
accepted Cannot ping over LAN until a ping is received
Jan
4
comment Cannot ping over LAN until a ping is received
oh and -- re: correct usage of "LAN"/"subnet", the boxes are separated by a router (and are both connecting via wifi). am i misusing terminolgy? if so, please suggest different verbage for my original question and i can edit it.
Jan
4
comment Cannot ping over LAN until a ping is received
@DavidSchwartz, see my comments on SmirksWhileWalkingWCabaretGirl's answer below re: ARP entries. oy, SmirksWhileWalkingWCabaretGirl, can't you find a shorter username??
Jan
4
comment Cannot ping over LAN until a ping is received
well, my IPs are not changing -- A stays on 192.168.1.109 and B stays on 192.168.1.110. this is a home network, via a cisco/linksys E1200, so i definitely don't expect the benefits of the equipment you describe. however, arp -a on each machine outputs different values before/after B 'announces' itself to A via a ping: B lists only the router (1.1) before, but lists A (1.109) after; A is similar but can also see a couple other addresses on the subnet. any clues from that?
Jan
4
awarded  Supporter
Jan
4
comment Cannot ping over LAN until a ping is received
hm, this sounds like it may be the right direction. a quick google turns up people frustrated with OSX's inability to manage power to NICs: discussions.apple.com/thread/3570949. will try your suggestion momentarily...
Jan
3
awarded  Autobiographer
Jan
3
asked Cannot ping over LAN until a ping is received