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enforce IPv6 DNS connection limit for /64 blocks

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This commit is contained in:
Daniel Micay 2024-03-28 12:35:29 -04:00
parent d95752bea6
commit 811fcf593e
2 changed files with 4 additions and 4 deletions
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4
nftables-ns1.conf
View File

@ -64,7 +64,7 @@ table inet filter {
iif lo tcp dport 22 tcp flags syn ip saddr != $ip-allowlist-ssh add @ip-connlimit-ssh { ip saddr ct count over 1 } reject with tcp reset
iif lo tcp dport 22 tcp flags syn ip6 saddr != $ip6-allowlist-ssh add @ip6-connlimit-ssh { ip6 saddr and ffff:ffff:ffff:ffff:ffff:: ct count over 1 } reject with tcp reset
iif lo tcp dport { 53, 853 } tcp flags syn add @ip-connlimit-dns { ip saddr ct count over 16 } reject with tcp reset
iif lo tcp dport { 53, 853 } tcp flags syn add @ip6-connlimit-dns { ip6 saddr ct count over 16 } reject with tcp reset
iif lo tcp dport { 53, 853 } tcp flags syn add @ip6-connlimit-dns { ip6 saddr and ffff:ffff:ffff:ffff:: ct count over 16 } reject with tcp reset
iif lo accept
udp dport 53 accept
@ -76,7 +76,7 @@ table inet filter {
tcp dport 22 ip6 saddr and ffff:ffff:ffff:ffff:ffff:: @ip6-connlimit-ssh reject with tcp reset
tcp dport 22 synproxy mss 1460 wscale 7 timestamp sack-perm
tcp dport { 53, 853 } ip saddr @ip-connlimit-dns reject with tcp reset
tcp dport { 53, 853 } ip6 saddr @ip6-connlimit-dns reject with tcp reset
tcp dport { 53, 853 } ip6 saddr and ffff:ffff:ffff:ffff:: @ip6-connlimit-dns reject with tcp reset
tcp dport { 53, 853 } synproxy mss 1460 wscale 7 timestamp sack-perm
}

4
nftables-ns2.conf
View File

@ -69,7 +69,7 @@ table inet filter {
iif lo tcp dport 22 tcp flags syn ip saddr != $ip-allowlist-ssh add @ip-connlimit-ssh { ip saddr ct count over 1 } reject with tcp reset
iif lo tcp dport 22 tcp flags syn ip6 saddr != $ip6-allowlist-ssh add @ip6-connlimit-ssh { ip6 saddr and ffff:ffff:ffff:ffff:ffff:: ct count over 1 } reject with tcp reset
iif lo tcp dport { 53, 853 } tcp flags syn add @ip-connlimit-dns { ip saddr ct count over 16 } reject with tcp reset
iif lo tcp dport { 53, 853 } tcp flags syn add @ip6-connlimit-dns { ip6 saddr ct count over 16 } reject with tcp reset
iif lo tcp dport { 53, 853 } tcp flags syn add @ip6-connlimit-dns { ip6 saddr and ffff:ffff:ffff:ffff:: ct count over 16 } reject with tcp reset
iif lo accept
udp dport 53 accept
@ -81,7 +81,7 @@ table inet filter {
tcp dport 22 ip6 saddr and ffff:ffff:ffff:ffff:ffff:: @ip6-connlimit-ssh reject with tcp reset
tcp dport 22 synproxy mss 1460 wscale 7 timestamp sack-perm
tcp dport { 53, 853 } ip saddr @ip-connlimit-dns reject with tcp reset
tcp dport { 53, 853 } ip6 saddr @ip6-connlimit-dns reject with tcp reset
tcp dport { 53, 853 } ip6 saddr and ffff:ffff:ffff:ffff:: @ip6-connlimit-dns reject with tcp reset
tcp dport { 53, 853 } synproxy mss 1460 wscale 7 timestamp sack-perm
}