Network Management

Summer 2017, Corboy 205, TTh 5:30-8:45 pm

Class 9: August 1

Assignment 4: moving a TCP connection

Continuation with and
   TCP connections take trunk 1, 2, or 3, in sequence.

What do we do with TCP connections? setting link bandwidths assign new TCP connections to one of the trunks, in round-robin fashion via picktrunk().
Note that this requires matching on the IP addresses and TCP ports, as well as the Ethernet addresses.

2. Assignment 4: moving TCP connections

3. Mininet and SNMP

We can install SNMP into the Mininet virtual machine with these two commands:
    apt-get install snmpd
    apt-get install snmp

We also have to configure /etc/snmp/snmpd.conf, but only once, on the base Mininet virtual machine. We can now start /usr/sbin/snmpd on each Mininet node, and it will share the configuration.

We can then run, eg
    snmpwalk -v 1 -c tengwar

What is this OID?

Continuation with SNMP

Read, sections 21.1-21.11

snmptable -v 2c -c tengwar ulam3 ipRouteTable
snmptable -v 2c -c tengwar ulam3 ipForwardTable    -- no entries
snmptable -v 2c -c tengwar ulam3 ipCidrRouteTable
snmptable -v 2c -c tengwar ulam3 inetCidrRouteTable



Other ways of polling devices:

    ssh: limitations: lack of "universal" account
              lack of "limited" account
              doesn't work for most hubs/switches/non-hosts