1 files changed, 22 insertions, 0 deletions

diff --git a/networking/udhcp/Config.in b/networking/udhcp/Config.in
index 734db65cc..1aef69ba7 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.