ipcomp tunnel from 1.1.1.1 to 2.2.2.2 spi 0x00001000 comp deflate
ipcomp tunnel from 2.2.2.2 to 1.1.1.1 spi 0x00001001 comp deflate
ipcomp tunnel from 3.3.3.3 to 4.4.4.4 spi 0x00002000 comp deflate
ipcomp tunnel from 4.4.4.4 to 3.3.3.3 spi 0x00002001 comp deflate