Review of Debian bugs

171831: requires significant redesign, in TODO as item 19990705
	(upstream acknowledges and has added it to the list)

181005: requires code change, added to TODO as item 20030214
	(upstream acknowledges and has added it to the list)
        (ip_gre module is not needed at all, comment made)
        (the GRE response is an acknowledgement packet)

209082: debian project's problem, not upstream