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-rw-r--r--gr-blocks/lib/tuntap_pdu_impl.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/gr-blocks/lib/tuntap_pdu_impl.cc b/gr-blocks/lib/tuntap_pdu_impl.cc
index 391b33937a..7bd0889d5e 100644
--- a/gr-blocks/lib/tuntap_pdu_impl.cc
+++ b/gr-blocks/lib/tuntap_pdu_impl.cc
@@ -57,7 +57,7 @@ namespace gr {
: block("tuntap_pdu",
io_signature::make (0, 0, 0),
io_signature::make (0, 0, 0)),
- stream_pdu_base(MTU),
+ stream_pdu_base(istunflag ? MTU : MTU + 14),
d_dev(dev),
d_istunflag(istunflag)
{