Manual Pages  — NG_VJC

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struct ngm_vjc_config {
  u_char   enableComp;    /* Enable compression */
  u_char   enableDecomp;  /* Enable decompression */
  u_char   maxChannel;    /* Number of outgoing channels - 1 */
  u_char   compressCID;   /* OK to compress outgoing CID's */
};

When enableComp is set to zero, all packets received on the ip hook are forwarded unchanged out the vjip hook. Similarly, when enableDecomp is set to zero, all packets received on the vjip hook are forwarded unchanged out the ip hook, and packets are not accepted on the vjcomp and vjuncomp hooks. When a node is first created, both compression and decompression are disabled and the node is therefore operating in bi-directional "pass through" mode.

When enabling compression, maxChannel should be set to the number of outgoing compression channels minus one, and is a value between 3 and 15, inclusive. The compressCID field indicates whether it is OK to compress the CID header field for outgoing compressed TCP packets. This value should be zero unless either (a) it is not possible for an outgoing frame to be lost, or (b) lost frames can be reliably detected and immediately reported to the peer's decompression engine (see NGM_VJC_RECV_ERROR below).