A strange issue, A simple ls on local volumes take forever to complete. Using strace gave a clue: # strace -fiqttvx ls -l /opt <snip> 10:26:37.917133 [002aa7a2] connect(4, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("142.216.0.1")}, 28) = 0 <snip> 10:26:47.912239 [002aa7a2] connect(4, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("142.216.0.1")}, 28) = 0 ... A socket on 142.216.0.1 is open and runs to timeout. Tcpdump gave more details: # tcpdump host 142.216.0.1 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 10:26:30.356929 IP 142.216.47.158.33198 > 142.216.0.1.domain: ... 10:26:50.358702 IP 142.216.47.158.33199 > 142.216.0.1.domain: ... 10:26:50.358728 IP 142.216.47.158.33198 > 142.216.0.1.domain: ... ... The wanted port is "domain" (=53); that's a DNS request. Checking /etc/resolv.conf gave the answer...