">err_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="ip4_8h.html#a0d912e400875396792a12ea443ecc1cf">ip4_output_if_opt</a> (struct <a class="el" href="structpbuf.html">pbuf</a> *p, const <a class="el" href="ip4__addr_8h.html#a3d3b45daffbc15d65da236e31e621b7e">ip4_addr_t</a> *src, const <a class="el" href="ip4__addr_8h.html#a3d3b45daffbc15d65da236e31e621b7e">ip4_addr_t</a> *dest, u8_t ttl, u8_t tos, u8_t proto, struct <a class="el" href="structnetif.html">netif</a> *<a class="el"