W5100/Ethernet cannot use socket as UDP after using it as TCP

SurferTim · April 28, 2013, 4:47pm

I am concerned about DoS when publishing my public ip, and not because of this code. Here is my serial monitor display for a short run. It will go on for hours like this.

Start!
Socket#0:0x14 80 D:0.0.0.0(0)
Socket#1:0x0 0 D:0.0.0.0(0)
Socket#2:0x0 0 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
xx.xx.58.116
Socket#0:0x14 80 D:0.0.0.0(0)
Socket#1:0x0 1024 D:xx.xx.58.115(53)
Socket#2:0x0 0 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
xx.xx.58.116
Socket#0:0x14 80 D:0.0.0.0(0)
Socket#1:0x0 1036 D:xx.xx.58.115(53)
Socket#2:0x0 0 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
xx.xx.58.116
Socket#0:0x14 80 D:0.0.0.0(0)
Socket#1:0x0 1031 D:xx.xx.58.115(53)
Socket#2:0x0 0 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
new Client
Socket#0:0x17 80 D:192.168.1.254(3691)
Socket#1:0x17 80 D:192.168.1.254(3692)
Socket#2:0x14 80 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
GET / HTTP/1.1
Host: 192.168.2.2
Connection: keep-alive
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3

client disconnected
xx.xx.58.116
Socket#0:0x0 1026 D:xx.xx.58.115(53)
Socket#1:0x17 80 D:192.168.1.254(3692)
Socket#2:0x14 80 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
new Client
Socket#0:0x14 80 D:xx.xx.58.115(53)
Socket#1:0x17 80 D:192.168.1.254(3692)
Socket#2:0x17 80 D:192.168.1.254(3693)
Socket#3:0x0 0 D:0.0.0.0(0)
GET / HTTP/1.1
Host: 192.168.2.2
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3

client disconnected
xx.xx.58.116
Socket#0:0x14 80 D:xx.xx.58.115(53)
Socket#1:0x0 1038 D:xx.xx.58.115(53)
Socket#2:0x17 80 D:192.168.1.254(3693)
Socket#3:0x0 0 D:0.0.0.0(0)
xx.xx.58.116
Socket#0:0x14 80 D:xx.xx.58.115(53)
Socket#1:0x0 1034 D:xx.xx.58.115(53)
Socket#2:0x0 80 D:192.168.1.254(3693)
Socket#3:0x0 0 D:0.0.0.0(0)
new Client
Socket#0:0x17 80 D:192.168.1.254(3694)
Socket#1:0x17 80 D:192.168.1.254(3695)
Socket#2:0x14 80 D:192.168.1.254(3693)
Socket#3:0x0 0 D:0.0.0.0(0)
GET / HTTP/1.1
Host: 192.168.2.2
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3

client disconnected
xx.xx.58.116
Socket#0:0x0 1029 D:xx.xx.58.115(53)
Socket#1:0x17 80 D:192.168.1.254(3695)
Socket#2:0x14 80 D:192.168.1.254(3693)
Socket#3:0x0 0 D:0.0.0.0(0)
new Client
Socket#0:0x14 80 D:xx.xx.58.115(53)
Socket#1:0x17 80 D:192.168.1.254(3695)
Socket#2:0x17 80 D:192.168.1.254(3698)
Socket#3:0x0 0 D:0.0.0.0(0)
GET / HTTP/1.1
Host: 192.168.2.2
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3

client disconnected
xx.xx.58.116
Socket#0:0x14 80 D:xx.xx.58.115(53)
Socket#1:0x0 1024 D:xx.xx.58.115(53)
Socket#2:0x17 80 D:192.168.1.254(3698)
Socket#3:0x0 0 D:0.0.0.0(0)
a
Socket#2:0x0 0 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
xx.xx.58.116
Socket#0:0x14 80 D:0.0.0.0(0)
Socket#1:0x0 1024 D:xx.xx.58.115(53)
Socket#2:0x0 0 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
xx.xx.58.116
Socket#0:0x14 80 D:0.0.0.0(0)
Socket#1:0x0 1036 D:xx.xx.58.115(53)
Socket#2:0x0 0 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
xx.xx.58.116
Socket#0:0x14 80 D:0.0.0.0(0)
Socket#1:0x0 1031 D:xx.xx.58.115(53)
Socket#2:0x0 0 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
new Client
Socket#0:0x17 80 D:192.168.1.254(3691)
Socket#1:0x17 80 D:192.168.1.254(3692)
Socket#2:0x14 80 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
GET / HTTP/1.1
Host: 192.168.2.2
Connection: keep-alive
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3

client disconnected
xx.xx.58.116
Socket#0:0x0 1026 D:xx.xx.58.115(53)
Socket#1:0x17 80 D:192.168.1.254(3692)
Socket#2:0x14 80 D:0.0.0.0(0)
Socket#3:0x0 0 D:0.0.0.0(0)
new Client
Socket#0:0x14 80 D:xx.xx.58.115(53)
Socket#1:0x17 80 D:192.168.1.254(3692)
Socket#2:0x17 80 D:192.168.1.254(3693)
Socket#3:0x0 0 D:0.0.0.0(0)
GET / HTTP/1.1
Host: 192.168.2.2
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3

client disconnected
xx.xx.58.116
Socket#0:0x14 80 D:xx.xx.58.115(53)
Socket#1:0x0 1038 D:xx.xx.58.115(53)
Socket#2:0x17 80 D:192.168.1.254(3693)
Socket#3:0x0 0 D:0.0.0.0(0)
xx.xx.58.116
Socket#0:0x14 80 D:xx.xx.58.115(53)
Socket#1:0x0 1034 D:xx.xx.58.115(53)
Socket#2:0x0 80 D:192.168.1.254(3693)
Socket#3:0x0 0 D:0.0.0.0(0)
new Client
Socket#0:0x17 80 D:192.168.1.254(3694)
Socket#1:0x17 80 D:192.168.1.254(3695)
Socket#2:0x14 80 D:192.168.1.254(3693)
Socket#3:0x0 0 D:0.0.0.0(0)
GET / HTTP/1.1
Host: 192.168.2.2
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3

client disconnected
xx.xx.58.116
Socket#0:0x0 1029 D:xx.xx.58.115(53)
Socket#1:0x17 80 D:192.168.1.254(3695)
Socket#2:0x14 80 D:192.168.1.254(3693)
Socket#3:0x0 0 D:0.0.0.0(0)
new Client
Socket#0:0x14 80 D:xx.xx.58.115(53)
Socket#1:0x17 80 D:192.168.1.254(3695)
Socket#2:0x17 80 D:192.168.1.254(3698)
Socket#3:0x0 0 D:0.0.0.0(0)
GET / HTTP/1.1
Host: 192.168.2.2
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3

client disconnected
xx.xx.58.116
Socket#0:0x14 80 D:xx.xx.58.115(53)
Socket#1:0x0 1024 D:xx.xx.58.115(53)
Socket#2:0x17 80 D:192.168.1.254(3698)
Socket#3:0x0 0 D:0.0.0.0(0)

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W5100/Ethernet cannot use socket as UDP after using it as TCP

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