From eef4776b5bb9d77a0dab0d9ac8da61fdbc72129f Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Sat, 18 Apr 2015 14:25:22 +0200
Subject: [PATCH] eth: ignore NewBlockMsg with lower td

---
 eth/handler.go | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/eth/handler.go b/eth/handler.go
index 065116fd0a..bb12e19043 100644
--- a/eth/handler.go
+++ b/eth/handler.go
@@ -257,8 +257,9 @@ func (self *ProtocolManager) handleMsg(p *peer) error {
 		})
 
 		// Make sure the block isn't already known. If this is the case simply drop
-		// the message and move on.
-		if self.chainman.HasBlock(hash) {
+		// the message and move on. If the TD is < currentTd; drop it as well. If this
+		// chain at some point becomes canonical, the downloader will fetch it.
+		if self.chainman.HasBlock(hash) && self.chainman.Td().Cmp(request.TD) > 0 {
 			break
 		}