Thursday, September 11, 2014

GNS3 IOU Server (GNS3 1.0 Beta 2)

Just thought I'd share this video out from my YouTube channel here also. So the two people who mistakenly read my blog this week can see how this is done.

GNS3 IOU Server

L2 Image I use -- i86bi-linux-l2-ipbasek9-15.1e.bin
L3 Image I use -- i86bi-linux-l3-adventerprisek9-


Modify this conf file on the server: /etc/sysctl.conf

# Mitigate %AMDP2_FE-6-EXCESSCOLL iou error
net.unix.max_dgram_qlen = 2000000


  1. thanks,

    what is the reason for this modification commands !??

  2. Without that addition to your sysctl.conf file, you see a lot of "%AMDP2_FE" errors on the L2 image. Granted, these errors don't have any real impact on your lab... but they're annoying. So, unless you want to disable logging on the l2 image, this modification to the host helps to reduce the chance of seeing those errors.

  3. can you please share how to configure static IP address and save it !??
    I have an OVA version, I changed its IP address and made it static,
    but when I boot the system it returns back to the previous one. The issue is sometimes it gives me an IP address different than !!!

    how to save config in GNS3 IOU !??

    thanks a lot

    1. No worries brother. So, username and password to log into the server are root/cisco. Then you'll need to modify /etc/network/interfaces

      Replace all the values with your preferred IP/Mask/GW
      auto eth0
      iface eth0 inet static