https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5390
Summary: 802.3 Jumbo frames not decoded (ISIS hello with large
MTU)
Product: Wireshark
Version: 1.5.x (Experimental)
Platform: All
OS/Version: All
Status: NEW
Severity: Minor
Priority: Low
Component: TShark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: olivier.montanuy@xxxxxxxxxxxxxxxxxx
Created an attachment (id=5454)
--> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=5454)
Frame with Ether Type 8870 containing an ISIS Hello for MTU 4470
Build Information:
Code trunk/epan/dissectors/packet-ethertype.c
SVN revision 34838 Modified Wed Nov 10 22:37:30 2010 UTC
--
The Jumbo LLC frames are not currently decoded by wireshark.
They can be used for any 802.3 frame of size above 1500,
especially IS-IS Hello on links with a MTU greater than 1500.
This is implemented on Cisco IOS-XR.
trunk/epan/dissectors/packet-ethertype.c
was modified in revision 34748 to document Jumbo LLC frames,
but the Jumbo frames are not handled by the function "capture_ethertype".
Maybe a bit of code like this would do the trick:
void
capture_ethertype(guint16 etype, const guchar *pd, int offset, int len,
packet_counts *ld)
{
switch (etype) {
...
case ETHERTYPE_JUMBO_LLC:
capture_llc(pd, offset, len, ld);
break;
...
}
}
--
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