What's the biggest problem for an VPS without dedicated IPv4 address?

liujason

So, if the VPS has dedicated IPv6 address but not IPv4, what's the biggest problem for it?

What if the VPS also has IPv4 NAT + ports forwarding + SLB with upload SSL certificate enabled?

JabJab

This is so general question (SLB, do you expect everyone to host website?) that only proper answer is:
Lack of IPv4 address.

TimboJones

Having an admin who doesn't say what it's for and expects a complete answer.

yoursunny

Biggest problem: services that require non TCP/UDP protocol or fixed ports cannot work.
This includes:

• SIT peer (not TCP/UDP)
• PPTP VPN server (TCP port cannot change)
• SMTP server (TCP port cannot change)
• DNS server (UDP port cannot change)
• 5G core network functions (SCTP port can change, but most NAT solution doesn't support SCTP)

bulbasaur

@yoursunny said: 5G core network functions (SCTP port can change, but most NAT solution doesn't support SCTP)

These are the comments that make coming to LET worth it. Always thought SCTP was an unloved protocol with no real world use.

ito

Hello, Jason
As far as I know, let only allows one account to exist. You and your cloudraft have achieved high-intensity publicity in the past few days. I don't think it is reasonable.
Do you have any explanation?

liujason

@yoursunny said:
Biggest problem: services that require non TCP/UDP protocol or fixed ports cannot work.
This includes:

• SIT peer (not TCP/UDP)
• PPTP VPN server (TCP port cannot change)
• SMTP server (TCP port cannot change)
• DNS server (UDP port cannot change)
• 5G core network functions (SCTP port can change, but most NAT solution doesn't support SCTP)

Thanks for sharing, it's indeed a problem especially for the SMTP server and DNS server use case.

mcgree

@liujason said:

@yoursunny said:
Biggest problem: services that require non TCP/UDP protocol or fixed ports cannot work.
This includes:

• SIT peer (not TCP/UDP)
• PPTP VPN server (TCP port cannot change)
• SMTP server (TCP port cannot change)
• DNS server (UDP port cannot change)
• 5G core network functions (SCTP port can change, but most NAT solution doesn't support SCTP)

Thanks for sharing, it's indeed a problem especially for the SMTP server and DNS server use case.

Passive FTP often doesn't work either, but I'm actually want NAT IPv4 + IPv6, even if IPv4 only has a few ports, mostly because GitHub is a really bad site (in IPv6).

bulbasaur

@liujason said:

@yoursunny said:
Biggest problem: services that require non TCP/UDP protocol or fixed ports cannot work.
This includes:

• SIT peer (not TCP/UDP)
• PPTP VPN server (TCP port cannot change)
• SMTP server (TCP port cannot change)
• DNS server (UDP port cannot change)
• 5G core network functions (SCTP port can change, but most NAT solution doesn't support SCTP)

Thanks for sharing, it's indeed a problem especially for the SMTP server and DNS server use case.

Hello alt of @VMRaft, I fear for your server management skills if you have to ask such questions here.

elliotc

The problem is that compare to my time cost, IPv4 is much cheaper.

yoursunny

@mcgree said:

@yoursunny said:
Biggest problem: services that require non TCP/UDP protocol or fixed ports cannot work.

Passive FTP often doesn't work either

Passive FTP works with just a few ports.
In vsftpd.conf, set pasv_min_port and pasv_max_port to a range within what you can use.
https://github.com/yoursunny/VNL/blob/bb1af71b90c64f8f135c399baac53ff949e199ac/guest-apps/vsftpd.conf#L8-L9