: For dynamic DNS records where the IP address can change frequently (e.g., in the case of some broadband connections that get a new IP address from the ISP periodically), a lower TTL like 3600 helps in ensuring that the cached record does not remain outdated for too long.
Understanding TTL 3600: What It Means and Why It’s the Industry Standard
EXPIRE mykey 3600 # or during set: SET mykey "value" EX 3600 ttl 3600
Key auto-deletes after 3600 seconds.
So ttl 3600 means:
If your site is extremely stable and you rarely change servers, you might use a TTL of 86400 (24 hours). This provides maximum performance and extra protection if your DNS provider goes offline, as resolvers will remember your IP for a full day.
where you expect no IP changes within an hour, but still want reasonable failover time. For mission-critical or rapidly changing services, use 300–600. For static infrastructure (e.g., office VPN, corporate mail), 86400+ is fine. : For dynamic DNS records where the IP
Are you planning to soon, or just looking to optimize your DNS performance ?
Since TTL is measured in seconds, the math for 3600 is simple: This provides maximum performance and extra protection if
SET session:123 "user_data" EXPIRE session:123 3600
| Use Case | TTL 3600 Good? | Reason | |----------|----------------|--------| | Website A record (stable IP) | ✅ Yes | Balances caching & propagation speed | | CDN or load balancer IP | ✅ Yes | Changes rare, performance matters | | Email (MX) records | ✅ Yes | Mail servers respect long TTLs | | Emergency failover IP | ❌ No (use 300 or 600) | Need fast switching | | Testing DNS changes | ❌ No (use 60–300) | Avoid long cache delays |
: For dynamic DNS records where the IP address can change frequently (e.g., in the case of some broadband connections that get a new IP address from the ISP periodically), a lower TTL like 3600 helps in ensuring that the cached record does not remain outdated for too long.
Understanding TTL 3600: What It Means and Why It’s the Industry Standard
EXPIRE mykey 3600 # or during set: SET mykey "value" EX 3600
Key auto-deletes after 3600 seconds.
So ttl 3600 means:
If your site is extremely stable and you rarely change servers, you might use a TTL of 86400 (24 hours). This provides maximum performance and extra protection if your DNS provider goes offline, as resolvers will remember your IP for a full day.
where you expect no IP changes within an hour, but still want reasonable failover time. For mission-critical or rapidly changing services, use 300–600. For static infrastructure (e.g., office VPN, corporate mail), 86400+ is fine.
Are you planning to soon, or just looking to optimize your DNS performance ?
Since TTL is measured in seconds, the math for 3600 is simple:
SET session:123 "user_data" EXPIRE session:123 3600
| Use Case | TTL 3600 Good? | Reason | |----------|----------------|--------| | Website A record (stable IP) | ✅ Yes | Balances caching & propagation speed | | CDN or load balancer IP | ✅ Yes | Changes rare, performance matters | | Email (MX) records | ✅ Yes | Mail servers respect long TTLs | | Emergency failover IP | ❌ No (use 300 or 600) | Need fast switching | | Testing DNS changes | ❌ No (use 60–300) | Avoid long cache delays |