ISPFocus TCP/IP Analyzer

Network Diagnostics

TCP/IP Analyzer

porta 57744

HTTP/1.1 TLS

216.73.217.177 IPv4 HTTP/1.1 TLS

TCP MSS1448 bytes🟢 Excelente • 97%

TCP Window Scale2^7 = 128xRFC 1323

RWIN Maximo8191 KBlimite de recepcao do cliente

Web Ping (Real-time) Medindo...

Retransmissoes0nesta sessao TLS

MTU do servidor8988 bytes7488 bytes acima (Jumbo) — informativo

Limite BDP (RWIN/RTT)483 Mbpsthroughput maximo teorico

97%

Qualidade
TCP MSS

100

Score TCP

Tabela de Classificacao TCP MSS

TCP MSS (snd_mss)	MTU do Servidor	Qualidade	%	Cenario tipico
1460	1500	🟢 Excelente	100%	MTU 1500, timestamps OFF
1448 ◄ você	1500	🟢 Excelente	97%	MTU 1500, timestamps ON ← mais comum
1452	1492	🟢 Muito Bom	94%	MTU 1492, timestamps OFF
1440	1492	🟢 Muito Bom	91%	MTU 1492, timestamps ON ou MTU 1480, timestamps OFF
1428	1480	🟡 Bom	88%	MTU 1480, timestamps ON
1400	1440	🟡 Bom	85%	MTU 1440, timestamps OFF
1388	1440	🟡 Razoavel	82%	MTU 1440, timestamps ON
1300	1300	🔴 Muito Ruim	79%	MSS menor ou igual a 1300 bytes

Opcoes TCP Negociadas no Handshake

Timestamps RFC1323: ON

SACK RFC2018: ON

Window Scaling: ON

ECN RFC3168: OFF

PMTUD RFC1191: ON

Detalhes da Conexao

IP do Cliente216.73.217.177

Versao IPIPv4

Protocolo HTTPHTTP/1.1

tcpi_snd_mss (TCP MSS real da comunicacao)1448 bytes ← METRICA PRINCIPAL

tcpi_rcv_mss (MSS para receber do cliente)536 bytes

tcpi_advmss (MSS anunciado pelo servidor)8948 bytes → base para MTU do servidor

MTU estimado do caminho8988 bytes (tcpi_advmss + 40B overhead IP+TCP)

MTU esperado (Ethernet)1500 bytes

Diferenca MTU+7488 bytes (jumbo)

Path MTU (PMTUD)9000 bytes (PMTUD)

Window Scale (cliente)2^7 = 128x → RWIN max 8191 KB

Window Scale (servidor)2^14 = 16384x

RTT (media kernel)138.8 ms

RTT variancia (jitter)±29.3 ms

Limite BDP (RWIN/RTT)483 Mbps

Retransmissoes0

Diagnostico e Recomendacoes

🟢Excelente — TCP MSS 1448 bytes (97% de qualidade)Excellent — TCP MSS 1448 bytes (97% quality)TCP MSS

MTU 1500, timestamps ON — mais comum.

TCP MSS (tcpi_snd_mss): 1448 bytes ← MSS real usado nos segmentos
tcpi_rcv_mss: 536 bytes ← MSS para receber do cliente
tcpi_advmss: 8948 bytes ← MSS anunciado pelo servidor
MTU estimado do caminho: 8988 bytes
Reducao vs. Ethernet puro: 0 bytes

MTU 1500, timestamps ON — mais comum.

TCP MSS (tcpi_snd_mss): 1448 bytes ← actual MSS used in segments
tcpi_rcv_mss: 536 bytes ← MSS for receiving from client
tcpi_advmss: 8948 bytes ← MSS announced by server
Estimated path MTU: 8988 bytes
Reduction vs. pure Ethernet: 0 bytes

🐧 Linux

🪟 Windows

🍎 macOS

Como verificar:

# Confirmar se o ss mostra o mesmo TCP MSS:
ss -tin dst 177.11.98.12 | grep mss
# 'mss:XXXX' deve corresponder ao valor exibido acima

# Confirm ss shows same TCP MSS:
ss -tin dst 177.11.98.12 | grep mss
# 'mss:XXXX' must match the value shown above

Como verificar:

# Windows:
netsh interface tcp show global
Get-NetTCPConnection -RemoteAddress 177.11.98.12 | Select-Object LocalAddress, RemoteAddress, State, AppliedSetting

# Windows:
netsh interface tcp show global
Get-NetTCPConnection -RemoteAddress 177.11.98.12 | Select-Object LocalAddress, RemoteAddress, State, AppliedSetting

Como verificar:

# macOS:
sysctl net.inet.tcp.mssdflt
sysctl net.inet.tcp.v6mssdflt

# macOS:
sysctl net.inet.tcp.mssdflt
sysctl net.inet.tcp.v6mssdflt

🟢Window Scaling 2^7 = 128x | RWIN max 8191 KBWindow Scaling 2^7 = 128x | Max RWIN 8191 KBTCP Window

RWIN maximo: 8388480 bytes (8191 KB).
Limite de throughput:
- A 10ms: 6711 Mbps
- A 50ms: 1342 Mbps
- A 100ms: 671 Mbps
- A 200ms: 336 Mbps

Maximum RWIN: 8388480 bytes (8191 KB).
Throughput limit:
- At 10ms: 6711 Mbps
- At 50ms: 1342 Mbps
- At 100ms: 671 Mbps
- At 200ms: 336 Mbps

🐧 Linux

🪟 Windows

🍎 macOS

Como verificar:

# Linux:
sysctl net.ipv4.tcp_rmem
ss -tin dst 177.11.98.12 | grep -E 'wscale|rcvq'

# Linux:
sysctl net.ipv4.tcp_rmem
ss -tin dst 177.11.98.12 | grep -E 'wscale|rcvq'

Como verificar:

# Windows:
netsh interface tcp show global

# Windows:
netsh interface tcp show global

Como verificar:

# macOS:
sysctl net.inet.tcp.recvspace
sysctl net.inet.tcp.maxsockbuf

# macOS:
sysctl net.inet.tcp.recvspace
sysctl net.inet.tcp.maxsockbuf

🟢SACK habilitado (RFC 2018)SACK enabled (RFC 2018)TCP SACK

Retransmissao seletiva ativa. Apenas segmentos perdidos sao reenviados.

Selective retransmission active. Only lost segments are resent.

🐧 Linux

🪟 Windows

🍎 macOS

Como verificar:

sysctl net.ipv4.tcp_sack

sysctl net.ipv4.tcp_sack

Como verificar:

netsh interface tcp show global

netsh interface tcp show global

Como verificar:

sysctl net.inet.tcp.sack

sysctl net.inet.tcp.sack

🔵Timestamps RFC 1323 ativos — reduz TCP MSS em 12 bytes (snd_mss=1448, advmss=8948)Timestamps RFC 1323 active — reduces TCP MSS by 12 bytes (snd_mss=1448, advmss=8948)TCP Timestamps

Timestamps ativos explicam a diferenca entre os campos:
tcpi_snd_mss = 1448 bytes (MSS efetivo — com desconto de 12 bytes)
tcpi_advmss = 8948 bytes (MSS base — sem desconto de timestamps)

Beneficios: medicao precisa de RTT (RTTM) e protecao PAWS.
Custo: 12 bytes por segmento (0.8% do payload).
Recomendacao: manter ativo — o custo e negligenciavel.

Active timestamps explain the difference between fields:
tcpi_snd_mss = 1448 bytes (effective MSS — 12 bytes deducted)
tcpi_advmss = 8948 bytes (base MSS — no timestamp deduction)

Benefits: precise RTT measurement (RTTM) and PAWS protection.
Cost: 12 bytes per segment (0.8% of payload).
Recomendation: keep active — the cost is negligible.

🐧 Linux

🪟 Windows

🍎 macOS

Como verificar:

# Linux:
sysctl net.ipv4.tcp_timestamps
# 0=desligado, 1=ligado, 2=ligado sem echo

# Confirmar diferenca entre snd_mss e advmss:
ss -tin dst 177.11.98.12

# Linux:
sysctl net.ipv4.tcp_timestamps
# 0=off, 1=on, 2=on without echo

# Confirm snd_mss vs advmss difference:
ss -tin dst 177.11.98.12

Como verificar:

# Windows:
netsh interface tcp show global

# Windows:
netsh interface tcp show global

Como verificar:

sysctl net.inet.tcp.timestamps

sysctl net.inet.tcp.timestamps

🔵ECN desabilitadoECN disabledECN

Opcional. Util em redes com QoS/AQM modernos.

Optional. Useful in networks with modern QoS/AQM.

🐧 Linux

🪟 Windows

🍎 macOS

sysctl -w net.ipv4.tcp_ecn=1

sysctl -w net.ipv4.tcp_ecn=1

Como verificar:

sysctl net.ipv4.tcp_ecn

sysctl net.ipv4.tcp_ecn

netsh interface tcp set global ecncapability=enabled

netsh interface tcp set global ecncapability=enabled

Como verificar:

netsh interface tcp show global

netsh interface tcp show global

sudo sysctl -w net.inet.tcp.ecn_initiate_out=1

sudo sysctl -w net.inet.tcp.ecn_initiate_out=1

Como verificar:

sysctl net.inet.tcp.ecn_initiate_out

sysctl net.inet.tcp.ecn_initiate_out

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