Hi Jesper, I'm not running DPDK on the receiving side. Just tcpdump. Can you please be more specific? What and how to convert to network byte order?
Thanks On Apr 9, 2016 7:45 AM, "Jesper Wramberg" <jesper.wramberg at gmail.com> wrote: > Hey Murad, > > Are you running DPDK on the receiving end as well ? > In any case, I'm guessing you forgot to convert to network byte order ? :-) > > > > 2016-04-09 12:34 GMT+02:00 Murad Kablan <Murad.Kablan at colorado.edu>: > >> Hi, >> I'm trying to change the IP and port of packets before sending them out. >> The captured packet in the receiving machines seems to be corrupted as the >> port is different than the one I inserted. Am I doing the checksum right? >> And do I need to do other HW configurations? >> >> This is my code: >> struct udp_hdr *udp_h; >> struct ipv4_hdr *ipv4_h; >> struct ether_hdr *eth_hdr; >> eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *); >> ipv4_h = (struct ipv4_hdr *)(eth_hdr + 1); >> udp_h = (struct udp_hdr *)((unsigned char *)ipv4_h + sizeof(struct >> ipv4_hdr)); >> >> ipv4_h->dst_addr = 6777226 //(gateway-ip 10.77.0.51) >> udp_h->src_port = 88 >> ipv4_h->hdr_checksum = 0; >> udp_h->dgram_cksum = 0; >> udp_h->dgram_cksum = rte_ipv4_udptcp_cksum(ipv4_h, udp_h); >> ipv4_h->hdr_checksum = rte_ipv4_cksum(ipv4_h); >> l2fwd_simple_forward(m, 0); >> >> Thanks, >> >> Murad >> > >
