I captured a single packet pcap file as follows:
tcpdump port 34102 -i eth5 -w hello1.pcap -s 0
I subsequently replay this as follows:
sudo tcpreplay --intf1=eth5 hello1.pcap
The packet shows up in tcpdump:
18:33:58.356808 00:15:17:9e:3f:f0 (oui Unknown) > 01:00:5e:7b:00:00 (oui
Unknown), ethertype IPv4 (0x0800), length 110: (tos 0x0, ttl 10, id 0,
offset 0, flags [DF], proto UDP (17), length 96)
elora.54106 > 224.123.0.0.34102: [udp sum ok] UDP, length 68
0x0000: 4500 0060 0000 4000 0a11 8d62 c0a8 4207
0x0010: e07b 0000 d35a 8536 004c 2e8a 0000 001d
0x0020: 0a19 08aa d5d6 aa05 1000 18ff ffff ff0f
0x0030: 2000 2800 30eb add3 91d8 2610 0000 0000
0x0040: 1f0a 1908 aad5 d6aa 0510 6618 ffff ffff
0x0050: 0f20 0028 0030 ebad d391 d826 1001 2001
But it does not make it into my application. This application has no
trouble picking up the initial packet (the one that was captured into a
pcap file). Indeed the application interface is quite well tested, and
can receive packets through normal channels. It just does not seem to be
able to pick up the tcpreplayed packet.
I am new to tcpreplay, but its usage seems quite straightforward. Why
does tcpdump see the replayed packet, but my application does not?
Any help would be appreciated.
Thank you.
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