title: Geth light node does not sync
body: <p>I want to check the balances of my wallets with the <code>geth console</code>. Therefore i did try to use geth in light mode. But when i use:</p>
  
  <p><code>geth console --syncmode light</code></p>
  
  <p>It gets stuck at block number 0 and it doesn't start to sync. Here are some results: </p>
  
  <ul>
  <li><p><code>web3.eth.syncing</code> - false</p></li>
  <li><p><code>eth.blockNumber</code> -  0</p></li>
  </ul>
  
  <p>The Version i use is: <code>1.7.3</code></p>
  
  <p>Anyone idea how i can force it to start the sync?</p>
  
  <p>This is the output i get:</p>
  
  <pre><code>WARN [12-01|12:02:28] No etherbase set and no accounts found as default
  INFO [12-01|12:02:28] Starting peer-to-peer node               instance=Geth/v1.7.3-stable-4bb3c89d/linux-amd64/go1.9
  INFO [12-01|12:02:28] Allocated cache and file handles         database=/root/.ethereum/geth/lightchaindata cache=128 handles=1024
  INFO [12-01|12:02:28] Writing default main-net genesis block
  INFO [12-01|12:02:29] Initialised chain configuration          config="{ChainID: 1 Homestead: 1150000 DAO: 1920000 DAOSupport: true EIP150: 2463000 EIP155: 2675000 EIP158: 2675000 Byzantium: 4370000 Engine: ethash}"
  INFO [12-01|12:02:29] Disk storage enabled for ethash caches   dir=/root/.ethereum/geth/ethash count=3
  INFO [12-01|12:02:29] Disk storage enabled for ethash DAGs     dir=/root/.ethash               count=2
  INFO [12-01|12:02:29] Added trusted checkpoint                 chain name="ETH mainnet"
  INFO [12-01|12:02:29] Loaded most recent local header          number=0 hash=d4e567…cb8fa3 td=17179869184
  INFO [12-01|12:02:29] Starting P2P networking
  INFO [12-01|12:02:31] UDP listener up                          self=enode://56ff89f879fea8caee295e2e60086b5b1d4e56e0a6135a351f35a092cfdbbc9b7c32261396e0be61998b773ba565e8ef05ed1d3cc1ac7e479ebbccefac754b65@[::]:30303
  WARN [12-01|12:02:31] Light client mode is an experimental feature
  INFO [12-01|12:02:31] RLPx listener up                         self=enode://56ff89f879fea8caee295e2e60086b5b1d4e56e0a6135a351f35a092cfdbbc9b7c32261396e0be61998b773ba565e8ef05ed1d3cc1ac7e479ebbccefac754b65@[::]:30303
  INFO [12-01|12:02:31] IPC endpoint opened: /root/.ethereum/geth.ipc
  </code></pre>
  
  <p>Thanks in advance!</p>