Hug Me wrote:
11:08:06.528691 IP (tos 0x4, ttl 255, id 0, offset 0, flags [DF], length:
51) 10.0.0.2.0 > 10.0.0.1.69: [udp sum ok] 23 RRQ "load2000v115.d" octet
We believe FreeBSD is not allowing a UDP source port of 0 and the kernel
is
dropping the packet before it ever reaches the tftp server but are
unable to
verify this hypothesis.
im using carp for highly availability and scalability with the help of layer
4 health check program that i made using source port 0 both for tcp and udp
protocols.... sample of tcpdump output from my layer 4 health check
program...
[EMAIL PROTECTED] fooler]#tcpdump -i lo0 -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on lo0, link-type NULL (BSD loopback), capture size 96 bytes
09:25:22.913088 IP 127.0.0.1.0 > 127.0.0.1.3128: S 0:0(0) win 65535
09:25:22.913111 IP 127.0.0.1.3128 > 127.0.0.1.0: S 3117019729:3117019729(0)
ack 1 win 64240 <mss 16344>
09:25:22.913121 IP 127.0.0.1.0 > 127.0.0.1.3128: R 1:1(0) win 0
09:25:22.923064 IP 127.0.0.1.0 > 127.0.0.1.53: [|domain]
09:25:23.934176 IP 127.0.0.1.0 > 127.0.0.1.3128: S 0:0(0) win 65535
09:25:23.934198 IP 127.0.0.1.3128 > 127.0.0.1.0: S 816240627:816240627(0)
ack 1 win 64240 <mss 16344>
09:25:23.934208 IP 127.0.0.1.0 > 127.0.0.1.3128: R 1:1(0) win 0
09:25:23.934222 IP 127.0.0.1.0 > 127.0.0.1.53: [|domain]
when proxy is alive (tcp port 3128) it will reply with syn/ack and i reply
it with reset.. when dns is alive (udp port 53)... the server wont reply
anything (and that is normal for udp).... but when proxy is dead... it will
reply with reset.... when dns is dead.. it will reply with icmp port
unreachable... this simply shows that source port 0 both for tcp and udp
work properly with freebsd...
fooler.
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