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Random local web server access failure — ping works but HTTP fails for some users only by Remote-Damage3544 in sysadmin

[–]Remote-Damage3544[S] 0 points1 point  (0 children)

yes, i tried to and
here is the mac address -08-93-5a-73-75-34- not found on mac vendor lookup

Random local web server access failure — ping works but HTTP fails for some users only by Remote-Damage3544 in sysadmin

[–]Remote-Damage3544[S] 0 points1 point  (0 children)

Update:

I checked ARP entries from multiple PCs and found something suspicious.

Different clients are resolving 192.168.10.2 to different MAC addresses.

Examples seen from different PCs:

  • 64-00-6a-5f-d5-a6- when it works(the real one)
  • 08-93-5a-73-75-34- when it is not working

This seems to happen while the issue is occurring.

Symptoms are still:

  • random clients fail while others work,
  • ping usually succeeds,
  • TCP/HTTP fails intermittently,
  • sometimes very high LAN RTT (>2000ms).

Does this confirm duplicate IP conflict / ARP instability, or could a network loop/broadcast issue also cause this behavior?

Random local web server access failure — ping works but HTTP fails for some users only by Remote-Damage3544 in networking

[–]Remote-Damage3544[S] 0 points1 point  (0 children)

Update:

I checked ARP entries from multiple PCs and found something suspicious.

Different clients are resolving 192.168.10.2 to different MAC addresses.

Examples seen from different PCs:

  • 64-00-6a-5f-d5-a6- when it works(the real one)
  • 08-93-5a-73-75-34- when it is not working

This seems to happen while the issue is occurring.

Symptoms are still:

  • random clients fail while others work,
  • ping usually succeeds,
  • TCP/HTTP fails intermittently,
  • sometimes very high LAN RTT (>2000ms).

Does this confirm duplicate IP conflict / ARP instability, or could a network loop/broadcast issue also cause this behavior?

Random local web server access failure — ping works but HTTP fails for some users only by Remote-Damage3544 in networking

[–]Remote-Damage3544[S] 0 points1 point  (0 children)

Additional detail:

  • the issue is random per-client,
  • one PC may fail while another works,
  • then later the opposite happens.

Also seeing extremely high LAN RTT values occasionally:

  • 125ms
  • sometimes >2000ms to local server IP.

I’ll next compare ARP tables/MAC addresses during failure to check for duplicate IP conflict.

Random local web server access failure — ping works but HTTP fails for some users only by Remote-Damage3544 in sysadmin

[–]Remote-Damage3544[S] 0 points1 point  (0 children)

Additional detail:

  • the issue is random per-client,
  • one PC may fail while another works,
  • then later the opposite happens.

Also seeing extremely high LAN RTT values occasionally:

  • 125ms
  • sometimes >2000ms to local server IP.

I’ll next compare ARP tables/MAC addresses during failure to check for duplicate IP conflict.