how many packet types can travel on Ethernet network?

Hello all,
I have added some debug statements in linux kernel 2.4.24 in
/usr/src/linux/net/core/dev.c
printk(KERN_DEBUG "in netif_receive_skb after skb->len = %d and
address = %p\n",skb->len,skb->data);
printk(KERN_DEBUG "In netif_receive_skb skb->nh.iph->ihl = %d &&
skb->nh.iph->version = %d\n",skb->nh.iph->ihl,skb->nh.iph->version);
printk(KERN_DEBUG "packet type is =%d\n",type);
where all these 3 statemets are placed in netif_receive_skb function
of dev.c and type is defined as
unsigned short type = skb->protocol;
Then i rebuild kernel and check it on network and found following
results.

in netif_receive_skb after skb->len = 186 and address = c75ec620
In netif_receive_skb skb->nh.iph->ihl = 0 && skb->nh.iph->version = 14
packet type is =1024

in netif_receive_skb after skb->len = 46 and address = c74633a0
In netif_receive_skb skb->nh.iph->ihl = 0 && skb->nh.iph->version = 0
packet type is =1544

in netif_receive_skb after skb->len = 84 and address = c7463aa0
In netif_receive_skb skb->nh.iph->ihl = 0 && skb->nh.iph->version = 14
packet type is =1024

in netif_receive_skb after skb->len = 100 and address = c74639a0
In netif_receive_skb skb->nh.iph->ihl = 0 && skb->nh.iph->version = 14
packet type is =1024

in netif_receive_skb after skb->len = 78 and address = c7463aa0
In netif_receive_skb skb->nh.iph->ihl = 5 && skb->nh.iph->version = 4
packet type is =8

I want to know which are these packet types?
I know only values 8 for IP and 2054 for ARP packets then which are
these packets 1024,1544.
regards,
linux_lover

(E-Mail Removed) (linux.lover) said:
>I have added some debug statements in linux kernel 2.4.24 in
>/usr/src/linux/net/core/dev.c
(to dump e.g. packet types)

>I want to know which are these packet types?
>I know only values 8 for IP and 2054 for ARP packets then which are
>these packets 1024,1544.

Google, with keywords ethernet packet types iana
gives a good link to a page at www.iana.org (Internet Assigned Numbers
Authority).

Note though that what you refer to as '8' is actually '0800' (in
hexadecimal). So, don't get confused with different number bases.
--
Wolf a.k.a. Juha Laiho Espoo, Finland
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"...cancel my subscription to the resurrection!" (Jim Morrison)

In article <(E-Mail Removed)> , linux.lover wrote:

In answer to your _subject_ line - 65536 ('type' is a 16 bit field in both
RFC894 and the little used RFC1042). However, not all types are assigned.
See http://www.iana.org/assignments/ethernet-numbers

>I have added some debug statements in linux kernel 2.4.24 in
>/usr/src/linux/net/core/dev.c

I don't have the source installed, but something appears to be drastically
wrong with your output. Either you have a transcription error when posting,
or your offsets to the data are wrong.

>I want to know which are these packet types?

I'd suggest running tcpdump along side your code until you are sure you
are grabbing the right bits out of the headers.

>I know only values 8 for IP and 2054 for ARP packets then which are
>these packets 1024,1544.

That makes no sense at all. There is no ethernet type 8. The '2054' would
be a decimal value to the 'type 0x0806' which is an ARP packet. There is
no type 1024 or 1544 in either decimal or hex. IP datagrams (actually IPv4)
have type 0x0800 or 2048 decimal.

Old guy