Maybe it has an MTU of less. Obsolete IP option 12 can send this during connect without the ICMP of PATH MTU Discovery.
The MSS is the total remote buffer, the MTU is the packet max. Disregarding the chance of TCP options, a packet header is 20 IP + 20 TCP, so a packet sends MTU - 40, and the number of packets sent before ack is MSS/(MTU-40) including any partial. Since this is local, the ack round trip should be very short, so packets should not be MSS trimmed unless there is blocking downstream.
Thanks for your support.
Well, I don't find anything in the IP header(s) which looks like IP option 12. Have attached a small wireshark dump, if you would like to have look though.
If it is to any help, the MTU of the interface at my host machine is set to 1500. And regarding the chip, I know it can handle a MTU of 536 + headers, as I can see the Windows application send it packets of this size (from the same machine too).
Hi,
When i try this command
ping ukblx151.ukhx.astrazeneca.net -n 3 | grep icmp
it gives following error :mad::
0821-077 ping: illegal packet size.
But when i give command
ping ukblx151.ukhx.astrazeneca.net
It returns correct output.:D
Could you please help? (2 Replies)
how to get network packet size
I would like get network output rate(kb/sec)
I type command "netstat -i"
Ipkts Ierrs Opkts Oerrs 653387 0 678202 0
but i didn't know what is it packet size ,
how could i get it? (1 Reply)
Hello,
I'm having an issue with TCP sockets.
When the TCP connection is terminated on one end, TCP packet with RST flag set is being sent to the sender. All the packets sent so far were carrying the DSCP 'AF21' set by me. But packet with RST flag is carrying DSCP '0'.
Is this expected or... (0 Replies)
Hi all,
I need to change the source port number of an outgoing TCP packet. First I have to bind the socket to a particular port(suppose 9001) but when I send the TCP packet I want to change the source port number lets say to 9002 still letting the socket to be bound to the same old port (9001).... (0 Replies)
We're running Solaris 7 on FDDI n/w on an E6500 host and wish to use MTU (packet size) > 1500, more like 3072 bytes to begin with and possibly up to 4096 bytes.
Linux has /etc/network/interfaces. Does ANYONE remember the equivalent in Unix? When I do ifconfig eth0 mtu 4000, I get the error... (0 Replies)
Greetings, I'm stuck in a time warp using ancient machines from the prehistoric era that should be rightfully displayed in the Smithsonian.
We're running Solaris 7 on FDDI n/w on an E6500 host and wish to use MTU (packet size) > 1500, more like 3072 bytes to begin with and possibly up to 4096... (9 Replies)
I have problem with oracle solaris 10 running on oracle sparc T4-2 server.
Os information: 5.10 Generic_150400-03 sun4v sparc sun4v
Output from tcpstat.d script
TCP bytes: out outRetrans in inDup inUnorder
6833763 7300 98884 0... (2 Replies)
I'd like to use SPARC Solaris10 to 'wake up' an old PC on same LAN.
what is the simplest way of doing it? (preferably without installing new software)
thanks. (14 Replies)
Discussion started by: orange47
14 Replies
LEARN ABOUT MINIX
s_n_d
SET_NET_DEFAULT(8) System Manager's Manual SET_NET_DEFAULT(8)NAME
s_n_d, set_net_default - select the default TCP/IP network
SYNOPSIS
set_net_default: not found
DESCRIPTION
This manual page is here because so many others refer to it. The set_net_default command does not exist under standard Minix, because the
TCP/IP server only supports one network. The server under Minix-vmd supports four different networks, that can each be chosen as the
default network.
The TCP/IP library and commands do have a notion about a "default network" however, because the code is shared between the Minix versions.
So if you want to venture into network programming then you should know about the devices and environment variables mentioned below to make
your program compatible. (Especially since there is a plan to upgrade the TCP/IP server for standard Minix.)
Options and environment to change the default
Many TCP/IP programs implement the following options and environment variables to change the default devices set by set_net_default. The
options are only implemented for low level programs where it makes sense to name a network device. The environment variables are used in
all code. You can run a process and all its children connected to a different network by setting four environment variables.
ETH_DEVICE=device
-E device
Device to use as raw ethernet device instead of the default /dev/eth.
PSIP_DEVICE=device
-P device
Pseudo IP device to use instead of /dev/psip.
IP_DEVICE=device
-I device
IP device to use instead of /dev/ip.
TCP_DEVICE=device
-T device
TCP device to use.
UDP_DEVICE=device
-U device
UDP device to use.
FILES
/dev/eth[01] First and second raw ethernet.
/dev/psip[01] First and second Pseudo IP network.
/dev/ip[0123] IP devices for two ethernets and two Pseudo IP networks.
/dev/tcp[0123] TCP devices for same four networks.
/dev/udp[0123] UDP devices.
/dev/eth, /dev/psip, /dev/ip, /dev/tcp, /dev/udp
Devices for the default network, links to the devices above. Eth is only present if ethernet is the default, psip only
for pseudo IP.
SEE ALSO ip(4), boot(8).
AUTHOR
Kees J. Bot (kjb@cs.vu.nl)
SET_NET_DEFAULT(8)