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-rw-r--r--networking/udhcp/Config.in22
1 files changed, 22 insertions, 0 deletions
diff --git a/networking/udhcp/Config.in b/networking/udhcp/Config.in
index 734db65..1aef69b 100644
--- a/networking/udhcp/Config.in
+++ b/networking/udhcp/Config.in
@@ -82,3 +82,25 @@ config FEATURE_RFC3397
help
If selected, both client and server will support passing of domain
search lists via option 119, specified in RFC3397.
+
+config UDHCPC_SLACK_FOR_BUGGY_SERVERS
+ int "DHCP options slack buffer size"
+ default 80
+ range 0 924
+ depends on APP_UDHCPD || APP_UDHCPC
+ help
+ Some buggy DHCP servers will send DHCP offer packets with option
+ field larger than we expect (which might also be considered a
+ buffer overflow attempt). These packets are normally discarded.
+ If circumstances beyond your control force you to support such
+ servers, this may help. The upper limit (924) makes dhcpc accept
+ even 1500 byte packets (maximum-sized ethernet packets).
+
+ This options does not make dhcp[cd] emit non-standard
+ sized packets.
+
+ Known buggy DHCP servers:
+ 3Com OfficeConnect Remote 812 ADSL Router:
+ seems to confuse maximum allowed UDP packet size with
+ maximum size of entire IP packet, and sends packets which are
+ 28 bytes too large.