Add a reasonable hard limit on the number of unreachable nodes in the list. When the list overflows, replace the oldest hostnames with the newest ones. When accepting Gossip, reject nodes with too many unreachables. (Can't just truncate their lists: eventually the lists will be signed and unmodifiable.)
Add a reasonable hard limit on the number of unreachable nodes in the list. When the list overflows, replace the oldest hostnames with the newest ones. When accepting Gossip, reject nodes with too many unreachables. (Can't just truncate their lists: eventually the lists will be signed and unmodifiable.)