Difference between revisions of "Troubleshoot"
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(4 intermediate revisions by the same user not shown) | |||
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− | == Not working network == | + | == "Not working" network == |
*Duplex | *Duplex | ||
*Cable | *Cable | ||
Line 13: | Line 13: | ||
*Zombie process and station or froze | *Zombie process and station or froze | ||
*Local firewall on device, or network type (windows-public) | *Local firewall on device, or network type (windows-public) | ||
− | + | *NAT | |
+ | *Cache browser - try incognito mode | ||
== Slow network == | == Slow network == | ||
Line 25: | Line 26: | ||
*Link type overhead + MTU | *Link type overhead + MTU | ||
*Aggregated interfaces - hashing type (source+destination IP) | *Aggregated interfaces - hashing type (source+destination IP) | ||
− | + | *CPU and RAM low especially tunneling encryption (AES-CBC not paralelized) | |
+ | *Rate limiting | ||
+ | *No offloading | ||
== MTU == | == MTU == |
Latest revision as of 21:50, 17 August 2021
"Not working" network
- Duplex
- Cable
- Firewall - disable it
- DNS filtering - public DNS
- ISP outage - ping its address
- Path outage - MTR tool
- ARP old record
- MAC collision
- STP loop/Broadcast storm
- Route missing
- LACP/PAGP must be on both ends configured
- Zombie process and station or froze
- Local firewall on device, or network type (windows-public)
- NAT
- Cache browser - try incognito mode
Slow network
- Path drop - MTR tool
- Number of active sessions on device
- Packet/Frame size
- Number of ACL on device
- Wireless is slower + wireless noise
- Duplex
- Cable
- Link type overhead + MTU
- Aggregated interfaces - hashing type (source+destination IP)
- CPU and RAM low especially tunneling encryption (AES-CBC not paralelized)
- Rate limiting
- No offloading
MTU
MTU MSS Article MSS/MTU
Testing max MTU
The important thing to remember is that an ICMP header is 8 bits so the ping test from CMD should be whatever number is your max without fragmenting PLUS 8 which gives your value for the router.