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Accepted
rusty shackleford
Asked: 2018-06-08 04:41:37 +0800 CST

Linux - net.ipv4.conf.all [duplicado]

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Estou alterando a configuração padrão arp_ignoreem um servidor Ubuntu 16.04, do valor padrão 0para 1.

Meu entendimento do /proc/sys/net/ipv4/conf/diretório é que os arquivos sob allafetarão todas as interfaces e defaultafetarão as interfaces recém-criadas.

Depois de alterar o valor de /proc/sys/net/ipv4/conf/all/arp_ignorepara 1, os outros arquivos ainda são definidos como 0:

cat /proc/sys/net/ipv4/conf/*/arp_ignore
1
0
0
0

O valor de /proc/sys/net/ipv4/conf/all/arp_ignoreapenas substitui os arquivos específicos da interface em vez de alterar seus valores?

linux ubuntu

1 respostas

  1. Best Answer

    achei algumas coisas aqui

        As far as I researched for IPv4 some time ago, the "default" value gets
copied to newly created interfaces only once.
"all" on the other hand allways gets applied in addition to the current
setting, but it depends on the exact setting, if its ORed, ANDed, or
whatevered:
    log_martians         OR
    accept_redirects     AND
    forwarding           ?
    mc_forwarding        AND
    medium_id
    proxy_arp            OR
    shared_media         OR
    secure_redirects     OR
    send_redirects       OR
    bootp_relay          AND
    accept_source_route  AND
    rp_filter            AND
    arp_filter           OR
    arp_announce         MAX
    arp_ignore           MAX
    arp_accept
    app_solicit
    disable_policy
    disable_xfrm
    tag
(see include/linux/inetdevice.h:83 for IN_DEV_{AND,OR,MAX}CONF)

Putting a new value in "all" doesn't change the value you read from
"$interface", but it only gets computed and used internally.
    • 1

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