Adding NAT class
Includes automatic NAT feature (mn --nat) and addNAT convenience method for topologies
fixes #111
Adding NAT class
Includes automatic NAT feature (mn --nat) and addNAT convenience method for topologies
fixes #111
undoing gateway in net and removing addNAT helpers
adding internet / nat example
more NAT cleanup of net and topo
fixing --nat option in mn
small fixes for NAT
mnexec: mount sysfs in each container

The sysfs filesystem is [tagged][1] with a set of namespaces when mounted, taken
from the mounting process. Among other things, this controls which network
devices will show up in /sys/class/net and /sys/class/net/bonding_masters.

Without this change, mininet will not mount sysfs in a node. Attempting to
configure a bond interface in a node will only affect the parent namespace.

This change mounts a new sysfs filesystem in each node. To prevent this mount
from affecting the parent namespace the mount namespace is also unshared.

[1]: https://www.kernel.org/doc/Documentation/filesystems/sysfs-tagging.txt
Close the file when done with it.
Correct the comments of do_pingallfull() and do_iperfudp()
Do not resolve addresses
Close the file when done with it.
Correct the comments of do_pingallfull() and do_iperfudp()
Merge branch 'master' of github.com:yeasy/mininet
fixup: Simplify_chained_comparaison
fixup: useless_parenthesis
fixup: unresolved_references
Close the file when done with it.
Correct the comments of do_pingallfull() and do_iperfudp()
Merge branch 'master' of github.com:yeasy/mininet