michi-jung commented on issue #11123:
URL: https://github.com/apache/nuttx/issues/11123#issuecomment-1793712719
```
(gdb) print *(struct iob_s *)0x2000fdec
$14 = {io_flink = 0x2000fd1c <g_iob_buffer+16224>, io_len = 182 '\266',
io_offset = 14 '\016', io_pktlen = 187,
io_data =
"\006T21\003T111.111\034E\000\000\311A\003@\000\001\021>&\n\000\000\001\357\377\377\372\276\336\al\000\265K-M-SEARCH
* HTTP/1.1\r\nHOST: 239.255.255.250:1900\r\nMAN: \"ssdp:discover\"\r\nMX:
1\r\nST: urn:dial-multiscreen-org:service:dial:1\r\nUSER-AGENT: Google
Chrome/119.0"}
(gdb) print *(struct iob_s *)0x2000fd1c
$15 = {io_flink = 0x0, io_len = 19 '\023', io_offset = 0 '\000', io_pktlen =
5,
io_data = ".6045.105
Linux\r\n\r\n\031@\000@\006&\265\n\000\000\002\n\000\000\001&\224\240\332;\232\314\035\277\300i\351P\020\066[l\246\000\000\002T21\003T
\n\036f\245/\000\000\000\000\001\003\003\a", '\000' <repeats 121 times>}
450000C9 IPv4 - 5 Word Header Len - 201 byte total len
41034000 Identification (0x4103) - DF (Don't fragment)
01113E26 Time to Live 0x01 - Protocol 0x11 (UDP) - Header Checksum 0x3E26
0D000001 Source IP Address 13.0.0.1
EFFFFFFA Destination IP Address 239.255.255.250 (Multicast address used in
UPnP)
BEDE076C Source port 48862, Destination port 1900 (UPnP)
00B54B2D Length 181 - Checksum 0x4B2D
Payload (154 bytes)
M-SEARCH * HTTP/1.1\r\nHOST: 239.255.255.250:1900\r\nMAN:
\"ssdp:discover\"\r\nMX: 1\r\nST:
urn:dial-multiscreen-org:service:dial:1\r\nUSER-AGENT: Google Chrome/119.0
Payload (19 bytes)
.6045.105 Linux\r\n\r\n\
```
The io_pktlen field is to low by 14 bytes in both IOBs (which equals the
io_offset of the first IOB of the chain, which is CONFIG_NET_LL_GUARDSIZE=14)
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