How can I track the load on the virtual network interface in linups?

  • With the help of sniffers (wireshark - ReinBegriff

2 answers 2

  • The most trivial solution (total volumes only) is to take readings of counters (octets and / or packets) from the interface in a certain time interval and find the difference. The old kernels do not have any syscoll for getting 64-bit counters, so the easiest way to look at /proc/net/dev : cat /proc/net/dev | awk '{ if (/^[[:space:]]*eth0:/) { print $2 + 10 } }' cat /proc/net/dev | awk '{ if (/^[[:space:]]*eth0:/) { print $2 + 10 } }'

    For new ones (from about two years ago), you can communicate via netlink using RTM_GETLINK with IFLA_STATS64 . The documentation on netlink is , alas, scanty and fragmented, but examples can be found, say, in the iproute2 code.

  • Monitoring occurring connections: netstat -t -u -c .

    This is implemented through conntrack events. A netlink socket is created that joins the NF_CT_NETLINK group, and there will be fly messages about changes in the connection table.

  • Package monitoring (optional, by connections): iptraf , iftop

    Implemented, as a rule, with sniffers, via libpcap. At least, iftop, uses it.

  • iptraf is from / proc / net / dev? - alexlz
  • No, it opens a "raw" socket and works with a sniffer. Here more: . There are no connections in /proc/net/dev at all, there are only interface statistics. Connections, however, can be found in /proc/net/nf_conntrack (if conntrack is not disabled, of course). - drdaeman

Wireshark, tcpdump. If you just want graphs, for example, through the "System Monitor" - in Ubuntu it is called that.