Re: udp or tcp?

[Mirek Kwasniak <mirek@zind.ikem.pwr.wroc.pl>]

On Sun, Sep 24, 2000 at 03:30:28PM +0200, Sven Burgener wrote:
> Hello
> 
> Is the following a tcp or a udp packet?  How do I tell?
> 
> Sep 24 15:20:25 host kernel: Packet log: input DENY eth0 \
> 	PROTO=17 10.209.80.109:68 255.255.255.255:67 \
> 	L=576 S=0x00 I=9145 F=0x4000 T=32 (#11)
> 
> This seems to be a broadcast by the DHCP server of my cable provider,
> right?

$ grep 17  /etc/protocols
#       from: @(#)protocols     5.1 (Berkeley) 4/17/89
udp     17      UDP             # user datagram protocol

$ grep '\<6[78]/'  /etc/services
bootps          67/tcp                          # BOOTP server
bootps          67/udp
bootpc          68/tcp                          # BOOTP client
bootpc          68/udp

It's udp broadcast of DHCP _client_.

Mirek