It looks like we have resolved our networking problems. ml.toom.im:9332, :9334, and :7903 should be available again outside our LAN once again, and woff.toom.im:9348 and :9327 once again have hashrate on them.
So what happen to all the shares I had on that node?
Your shares were not on that node. They were on the p2pool network. When my nodes go down, they're no longer contributing to the p2pool network, but the shares that were mined before my nodes went down have been copied to all other nodes on the same network (i.e. jtoomimnet).