Hot Downloads

×

Notice

The forum is in read only mode.
Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1
  • 2

TOPIC: TCP Retransmissions

TCP Retransmissions 12 years 1 month ago #16337

  • wlekns
  • wlekns's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 10
  • Thank you received: 0
My clients are reporting slowness and hangs in the applications. When packet sniffing I am finding a large number of TCP Retransmissions - how do I tell if it is my device that is causing the issue or if the client device is sending bad packets?

Re: TCP Retransmissions 12 years 1 month ago #16338

  • Arani
  • Arani's Avatar
  • Offline
  • Moderator
  • Moderator
  • Posts: 745
  • Karma: 4
  • Thank you received: 10
hi,
check the source address of all the packets that required retransmissions. if there are more than one client devices sending packets into the network for other devices as destinations, then check which is the one giving out the most retransmitted packets. retransmissions can be due to various factors, lost packets is very common, damaged ones, etc are other causes. find out bottlenecks in your network structures. check for all points of entry and exit for packets where packet switching is being done.
Picking pebbles on the shore of the networking ocean

Re: TCP Retransmissions 12 years 1 month ago #16344

Depending on which software you are using. You should be able to "walk through" the conversations, and see where the failure is. We use Ethereal amongst others and that is quite good at finding things like that.

Re: TCP Retransmissions 12 years 1 month ago #16355

  • wlekns
  • wlekns's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 10
  • Thank you received: 0
My Ethereal experience is limited

When stepping through using Ethereal the output is garbled - suggestions?

Re: TCP Retransmissions 12 years 1 month ago #16377

Garbled how exactly?

Re: TCP Retransmissions 12 years 1 month ago #16382

Assuming there are no security issues, maybe you could dump your trace here, and we can have a look at it for you.

Cheers

Rockape
  • Page:
  • 1
  • 2
Time to create page: 0.148 seconds

CCENT/CCNA

Cisco Routers

  • SSL WebVPN
  • Securing Routers
  • Policy Based Routing
  • Router on-a-Stick

VPN Security

  • Understand DMVPN
  • GRE/IPSec Configuration
  • Site-to-Site IPSec VPN
  • IPSec Modes

Cisco Help

  • VPN Client Windows 8
  • VPN Client Windows 7
  • CCP Display Problem
  • Cisco Support App.

Windows 2012

  • New Features
  • Licensing
  • Hyper-V / VDI
  • Install Hyper-V

Linux

  • File Permissions
  • Webmin
  • Groups - Users
  • Samba Setup