Does the ip_en converter handle fragmentation? From the name,
“IP/Ethernet Converter”, one would expect to find complete IP packets
(up to at least 64 Kbytes long) moving in both directions at the top of
the converter, and, of course, packets of 1500 bytes or less at the
bottom. My rudimentary tests, however, indicate that this is not true.
Are my tests faulty, have I inserted by “IP/IP BELOW” filter at the
wrong level, or is ip_en merely an ARP handler? Whichever the case, a
few more words of documentation on the subject might be nice.
Murf
John A. Murphy
Senior Software Sorcerer
PerfTech Bulletin Services, Ltd.
It’s basically an “ARP handler”. fragmentation is handled
in the stack itself.
-seanb
John A. Murphy <murf@perftech.com> wrote:
: Does the ip_en converter handle fragmentation? From the name,
: “IP/Ethernet Converter”, one would expect to find complete IP packets
: (up to at least 64 Kbytes long) moving in both directions at the top of
: the converter, and, of course, packets of 1500 bytes or less at the
: bottom. My rudimentary tests, however, indicate that this is not true.
: Are my tests faulty, have I inserted by “IP/IP BELOW” filter at the
: wrong level, or is ip_en merely an ARP handler? Whichever the case, a
: few more words of documentation on the subject might be nice.
: Murf
: John A. Murphy
: Senior Software Sorcerer
: PerfTech Bulletin Services, Ltd.
Typically the IP_EN converter is just for encapsulating/decapsulating
the IP packet into/from an ethernet packet and do the address
resolution(ARP).It is not supposed to do the Defragmentation.As you know
that each fragment is a IP packet with a complete header.Any fragmentation
and Defragementation will be done at IP layer(Above your filter).Which is
probably the reason you are not able to see the effects of fragmentation.
Sreekanth
“John A. Murphy” <murf@perftech.com> wrote in message
news:3CCE7CEC.8468DC8F@perftech.com…
Does the ip_en converter handle fragmentation? From the name,
“IP/Ethernet Converter”, one would expect to find complete IP packets
(up to at least 64 Kbytes long) moving in both directions at the top of
the converter, and, of course, packets of 1500 bytes or less at the
bottom. My rudimentary tests, however, indicate that this is not true.
Are my tests faulty, have I inserted by “IP/IP BELOW” filter at the
wrong level, or is ip_en merely an ARP handler? Whichever the case, a
few more words of documentation on the subject might be nice.
Murf
John A. Murphy
Senior Software Sorcerer
PerfTech Bulletin Services, Ltd.
That’s what I suspected, but the name is misleading.
Thanks for the clarification!
Murf
Sean Boudreau wrote:
It’s basically an “ARP handler”. fragmentation is handled
in the stack itself.
-seanb
John A. Murphy <> murf@perftech.com> > wrote:
: Does the ip_en converter handle fragmentation? From the name,
: “IP/Ethernet Converter”, one would expect to find complete IP packets
: (up to at least 64 Kbytes long) moving in both directions at the top of
: the converter, and, of course, packets of 1500 bytes or less at the
: bottom. My rudimentary tests, however, indicate that this is not true.
: Are my tests faulty, have I inserted by “IP/IP BELOW” filter at the
: wrong level, or is ip_en merely an ARP handler? Whichever the case, a
: few more words of documentation on the subject might be nice.
: Murf
: John A. Murphy
: Senior Software Sorcerer
: PerfTech Bulletin Services, Ltd.
That’s what I suspected, but the name is misleading.
Thanks for the clarification!
Murf
Sean Boudreau wrote:
It’s basically an “ARP handler”. fragmentation is handled
in the stack itself.
-seanb
John A. Murphy <> murf@perftech.com> > wrote:
: Does the ip_en converter handle fragmentation? From the name,
: “IP/Ethernet Converter”, one would expect to find complete IP packets
: (up to at least 64 Kbytes long) moving in both directions at the top of
: the converter, and, of course, packets of 1500 bytes or less at the
: bottom. My rudimentary tests, however, indicate that this is not true.
: Are my tests faulty, have I inserted by “IP/IP BELOW” filter at the
: wrong level, or is ip_en merely an ARP handler? Whichever the case, a
: few more words of documentation on the subject might be nice.
: Murf
: John A. Murphy
: Senior Software Sorcerer
: PerfTech Bulletin Services, Ltd.