Date:	Wed, 28 Apr 2010 02:11:47 -0400
From:	Thomas Graf <tgraf@...radead.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [RFC] random SYN drops causing connect() delays

On Wed, Apr 28, 2010 at 07:52:46AM +0200, Eric Dumazet wrote:
> On machine/kernel reproducing the behavior, please send
> 
> grep . /proc/sys/net/ipv4/*

net.ipv4.route.gc_thresh = 262144
net.ipv4.route.max_size = 4194304
net.ipv4.route.gc_min_interval = 0
net.ipv4.route.gc_min_interval_ms = 500
net.ipv4.route.gc_timeout = 300
net.ipv4.route.gc_interval = 60
net.ipv4.route.redirect_load = 20
net.ipv4.route.redirect_number = 9
net.ipv4.route.redirect_silence = 20480
net.ipv4.route.error_cost = 1000
net.ipv4.route.error_burst = 5000
net.ipv4.route.gc_elasticity = 8
net.ipv4.route.mtu_expires = 600
net.ipv4.route.min_pmtu = 552
net.ipv4.route.min_adv_mss = 256
net.ipv4.route.secret_interval = 600
net.ipv4.neigh.default.mcast_solicit = 3
net.ipv4.neigh.default.ucast_solicit = 3
net.ipv4.neigh.default.app_solicit = 0
net.ipv4.neigh.default.retrans_time = 99
net.ipv4.neigh.default.base_reachable_time = 30
net.ipv4.neigh.default.delay_first_probe_time = 5
net.ipv4.neigh.default.gc_stale_time = 60
net.ipv4.neigh.default.unres_qlen = 3
net.ipv4.neigh.default.proxy_qlen = 64
net.ipv4.neigh.default.anycast_delay = 99
net.ipv4.neigh.default.proxy_delay = 79
net.ipv4.neigh.default.locktime = 99
net.ipv4.neigh.default.retrans_time_ms = 1000
net.ipv4.neigh.default.base_reachable_time_ms = 30000
net.ipv4.neigh.default.gc_interval = 30
net.ipv4.neigh.default.gc_thresh1 = 128
net.ipv4.neigh.default.gc_thresh2 = 512
net.ipv4.neigh.default.gc_thresh3 = 1024
net.ipv4.neigh.lo.mcast_solicit = 3
net.ipv4.neigh.lo.ucast_solicit = 3
net.ipv4.neigh.lo.app_solicit = 0
net.ipv4.neigh.lo.retrans_time = 99
net.ipv4.neigh.lo.base_reachable_time = 30
net.ipv4.neigh.lo.delay_first_probe_time = 5
net.ipv4.neigh.lo.gc_stale_time = 60
net.ipv4.neigh.lo.unres_qlen = 3
net.ipv4.neigh.lo.proxy_qlen = 64
net.ipv4.neigh.lo.anycast_delay = 99
net.ipv4.neigh.lo.proxy_delay = 79
net.ipv4.neigh.lo.locktime = 99
net.ipv4.neigh.lo.retrans_time_ms = 1000
net.ipv4.neigh.lo.base_reachable_time_ms = 30000
net.ipv4.neigh.eth0.mcast_solicit = 3
net.ipv4.neigh.eth0.ucast_solicit = 3
net.ipv4.neigh.eth0.app_solicit = 0
net.ipv4.neigh.eth0.retrans_time = 99
net.ipv4.neigh.eth0.base_reachable_time = 30
net.ipv4.neigh.eth0.delay_first_probe_time = 5
net.ipv4.neigh.eth0.gc_stale_time = 60
net.ipv4.neigh.eth0.unres_qlen = 3
net.ipv4.neigh.eth0.proxy_qlen = 64
net.ipv4.neigh.eth0.anycast_delay = 99
net.ipv4.neigh.eth0.proxy_delay = 79
net.ipv4.neigh.eth0.locktime = 99
net.ipv4.neigh.eth0.retrans_time_ms = 1000
net.ipv4.neigh.eth0.base_reachable_time_ms = 30000
net.ipv4.neigh.eth1.mcast_solicit = 3
net.ipv4.neigh.eth1.ucast_solicit = 3
net.ipv4.neigh.eth1.app_solicit = 0
net.ipv4.neigh.eth1.retrans_time = 99
net.ipv4.neigh.eth1.base_reachable_time = 30
net.ipv4.neigh.eth1.delay_first_probe_time = 5
net.ipv4.neigh.eth1.gc_stale_time = 60
net.ipv4.neigh.eth1.unres_qlen = 3
net.ipv4.neigh.eth1.proxy_qlen = 64
net.ipv4.neigh.eth1.anycast_delay = 99
net.ipv4.neigh.eth1.proxy_delay = 79
net.ipv4.neigh.eth1.locktime = 99
net.ipv4.neigh.eth1.retrans_time_ms = 1000
net.ipv4.neigh.eth1.base_reachable_time_ms = 30000
net.ipv4.neigh.pan0.mcast_solicit = 3
net.ipv4.neigh.pan0.ucast_solicit = 3
net.ipv4.neigh.pan0.app_solicit = 0
net.ipv4.neigh.pan0.retrans_time = 99
net.ipv4.neigh.pan0.base_reachable_time = 30
net.ipv4.neigh.pan0.delay_first_probe_time = 5
net.ipv4.neigh.pan0.gc_stale_time = 60
net.ipv4.neigh.pan0.unres_qlen = 3
net.ipv4.neigh.pan0.proxy_qlen = 64
net.ipv4.neigh.pan0.anycast_delay = 99
net.ipv4.neigh.pan0.proxy_delay = 79
net.ipv4.neigh.pan0.locktime = 99
net.ipv4.neigh.pan0.retrans_time_ms = 1000
net.ipv4.neigh.pan0.base_reachable_time_ms = 30000
net.ipv4.neigh.virbr0.mcast_solicit = 3
net.ipv4.neigh.virbr0.ucast_solicit = 3
net.ipv4.neigh.virbr0.app_solicit = 0
net.ipv4.neigh.virbr0.retrans_time = 99
net.ipv4.neigh.virbr0.base_reachable_time = 30
net.ipv4.neigh.virbr0.delay_first_probe_time = 5
net.ipv4.neigh.virbr0.gc_stale_time = 60
net.ipv4.neigh.virbr0.unres_qlen = 3
net.ipv4.neigh.virbr0.proxy_qlen = 64
net.ipv4.neigh.virbr0.anycast_delay = 99
net.ipv4.neigh.virbr0.proxy_delay = 79
net.ipv4.neigh.virbr0.locktime = 99
net.ipv4.neigh.virbr0.retrans_time_ms = 1000
net.ipv4.neigh.virbr0.base_reachable_time_ms = 30000
net.ipv4.neigh.virbr1.mcast_solicit = 3
net.ipv4.neigh.virbr1.ucast_solicit = 3
net.ipv4.neigh.virbr1.app_solicit = 0
net.ipv4.neigh.virbr1.retrans_time = 99
net.ipv4.neigh.virbr1.base_reachable_time = 30
net.ipv4.neigh.virbr1.delay_first_probe_time = 5
net.ipv4.neigh.virbr1.gc_stale_time = 60
net.ipv4.neigh.virbr1.unres_qlen = 3
net.ipv4.neigh.virbr1.proxy_qlen = 64
net.ipv4.neigh.virbr1.anycast_delay = 99
net.ipv4.neigh.virbr1.proxy_delay = 79
net.ipv4.neigh.virbr1.locktime = 99
net.ipv4.neigh.virbr1.retrans_time_ms = 1000
net.ipv4.neigh.virbr1.base_reachable_time_ms = 30000
net.ipv4.neigh.virbr2.mcast_solicit = 3
net.ipv4.neigh.virbr2.ucast_solicit = 3
net.ipv4.neigh.virbr2.app_solicit = 0
net.ipv4.neigh.virbr2.retrans_time = 99
net.ipv4.neigh.virbr2.base_reachable_time = 30
net.ipv4.neigh.virbr2.delay_first_probe_time = 5
net.ipv4.neigh.virbr2.gc_stale_time = 60
net.ipv4.neigh.virbr2.unres_qlen = 3
net.ipv4.neigh.virbr2.proxy_qlen = 64
net.ipv4.neigh.virbr2.anycast_delay = 99
net.ipv4.neigh.virbr2.proxy_delay = 79
net.ipv4.neigh.virbr2.locktime = 99
net.ipv4.neigh.virbr2.retrans_time_ms = 1000
net.ipv4.neigh.virbr2.base_reachable_time_ms = 30000
net.ipv4.neigh.tun0.mcast_solicit = 3
net.ipv4.neigh.tun0.ucast_solicit = 3
net.ipv4.neigh.tun0.app_solicit = 0
net.ipv4.neigh.tun0.retrans_time = 99
net.ipv4.neigh.tun0.base_reachable_time = 30
net.ipv4.neigh.tun0.delay_first_probe_time = 5
net.ipv4.neigh.tun0.gc_stale_time = 60
net.ipv4.neigh.tun0.unres_qlen = 3
net.ipv4.neigh.tun0.proxy_qlen = 64
net.ipv4.neigh.tun0.anycast_delay = 99
net.ipv4.neigh.tun0.proxy_delay = 79
net.ipv4.neigh.tun0.locktime = 99
net.ipv4.neigh.tun0.retrans_time_ms = 1000
net.ipv4.neigh.tun0.base_reachable_time_ms = 30000
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_retrans_collapse = 1
net.ipv4.ip_default_ttl = 64
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.ip_nonlocal_bind = 0
net.ipv4.tcp_syn_retries = 5
net.ipv4.tcp_synack_retries = 5
net.ipv4.tcp_max_orphans = 65536
net.ipv4.tcp_max_tw_buckets = 180000
net.ipv4.ip_dynaddr = 0
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_intvl = 75
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_retries2 = 15
net.ipv4.tcp_fin_timeout = 60
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_abort_on_overflow = 0
net.ipv4.tcp_stdurg = 0
net.ipv4.tcp_rfc1337 = 0
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.ip_local_port_range = 32768	61000
net.ipv4.igmp_max_memberships = 20
net.ipv4.igmp_max_msf = 10
net.ipv4.inet_peer_threshold = 65664
net.ipv4.inet_peer_minttl = 120
net.ipv4.inet_peer_maxttl = 600
net.ipv4.inet_peer_gc_mintime = 10
net.ipv4.inet_peer_gc_maxtime = 120
net.ipv4.tcp_orphan_retries = 0
net.ipv4.tcp_fack = 1
net.ipv4.tcp_reordering = 3
net.ipv4.tcp_ecn = 2
net.ipv4.tcp_dsack = 1
net.ipv4.tcp_mem = 573408	764544	1146816
net.ipv4.tcp_wmem = 4096	16384	4194304
net.ipv4.tcp_rmem = 4096	87380	4194304
net.ipv4.tcp_app_win = 31
net.ipv4.tcp_adv_win_scale = 2
net.ipv4.tcp_tw_reuse = 0
net.ipv4.tcp_frto = 2
net.ipv4.tcp_frto_response = 0
net.ipv4.tcp_low_latency = 0
net.ipv4.tcp_no_metrics_save = 0
net.ipv4.tcp_moderate_rcvbuf = 1
net.ipv4.tcp_tso_win_divisor = 3
net.ipv4.tcp_congestion_control = cubic
net.ipv4.tcp_abc = 0
net.ipv4.tcp_mtu_probing = 0
net.ipv4.tcp_base_mss = 512
net.ipv4.tcp_workaround_signed_windows = 0
net.ipv4.tcp_dma_copybreak = 4096
net.ipv4.tcp_slow_start_after_idle = 1
net.ipv4.cipso_cache_enable = 1
net.ipv4.cipso_cache_bucket_size = 10
net.ipv4.cipso_rbm_optfmt = 0
net.ipv4.cipso_rbm_strictvalid = 1
net.ipv4.tcp_available_congestion_control = cubic reno
net.ipv4.tcp_allowed_congestion_control = cubic reno
net.ipv4.tcp_max_ssthresh = 0
net.ipv4.tcp_cookie_size = 0
net.ipv4.tcp_thin_linear_timeouts = 0
net.ipv4.tcp_thin_dupack = 0
net.ipv4.udp_mem = 573408	764544	1146816
net.ipv4.udp_rmem_min = 4096
net.ipv4.udp_wmem_min = 4096
net.ipv4.conf.all.forwarding = 1
net.ipv4.conf.all.mc_forwarding = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 1
net.ipv4.conf.all.shared_media = 1
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.all.send_redirects = 1
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.accept_local = 0
net.ipv4.conf.all.src_valid_mark = 0
net.ipv4.conf.all.proxy_arp = 0
net.ipv4.conf.all.medium_id = 0
net.ipv4.conf.all.bootp_relay = 0
net.ipv4.conf.all.log_martians = 0
net.ipv4.conf.all.tag = 0
net.ipv4.conf.all.arp_filter = 0
net.ipv4.conf.all.arp_announce = 0
net.ipv4.conf.all.arp_ignore = 0
net.ipv4.conf.all.arp_accept = 0
net.ipv4.conf.all.arp_notify = 0
net.ipv4.conf.all.proxy_arp_pvlan = 0
net.ipv4.conf.all.disable_xfrm = 0
net.ipv4.conf.all.disable_policy = 0
net.ipv4.conf.all.force_igmp_version = 0
net.ipv4.conf.all.promote_secondaries = 0
net.ipv4.conf.default.forwarding = 1
net.ipv4.conf.default.mc_forwarding = 0
net.ipv4.conf.default.accept_redirects = 1
net.ipv4.conf.default.secure_redirects = 1
net.ipv4.conf.default.shared_media = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.send_redirects = 1
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.accept_local = 0
net.ipv4.conf.default.src_valid_mark = 0
net.ipv4.conf.default.proxy_arp = 0
net.ipv4.conf.default.medium_id = 0
net.ipv4.conf.default.bootp_relay = 0
net.ipv4.conf.default.log_martians = 0
net.ipv4.conf.default.tag = 0
net.ipv4.conf.default.arp_filter = 0
net.ipv4.conf.default.arp_announce = 0
net.ipv4.conf.default.arp_ignore = 0
net.ipv4.conf.default.arp_accept = 0
net.ipv4.conf.default.arp_notify = 0
net.ipv4.conf.default.proxy_arp_pvlan = 0
net.ipv4.conf.default.disable_xfrm = 0
net.ipv4.conf.default.disable_policy = 0
net.ipv4.conf.default.force_igmp_version = 0
net.ipv4.conf.default.promote_secondaries = 0
net.ipv4.conf.lo.forwarding = 1
net.ipv4.conf.lo.mc_forwarding = 0
net.ipv4.conf.lo.accept_redirects = 1
net.ipv4.conf.lo.secure_redirects = 1
net.ipv4.conf.lo.shared_media = 1
net.ipv4.conf.lo.rp_filter = 1
net.ipv4.conf.lo.send_redirects = 1
net.ipv4.conf.lo.accept_source_route = 0
net.ipv4.conf.lo.accept_local = 0
net.ipv4.conf.lo.src_valid_mark = 0
net.ipv4.conf.lo.proxy_arp = 0
net.ipv4.conf.lo.medium_id = 0
net.ipv4.conf.lo.bootp_relay = 0
net.ipv4.conf.lo.log_martians = 0
net.ipv4.conf.lo.tag = 0
net.ipv4.conf.lo.arp_filter = 0
net.ipv4.conf.lo.arp_announce = 0
net.ipv4.conf.lo.arp_ignore = 0
net.ipv4.conf.lo.arp_accept = 0
net.ipv4.conf.lo.arp_notify = 0
net.ipv4.conf.lo.proxy_arp_pvlan = 0
net.ipv4.conf.lo.disable_xfrm = 1
net.ipv4.conf.lo.disable_policy = 1
net.ipv4.conf.lo.force_igmp_version = 0
net.ipv4.conf.lo.promote_secondaries = 0
net.ipv4.conf.eth0.forwarding = 1
net.ipv4.conf.eth0.mc_forwarding = 0
net.ipv4.conf.eth0.accept_redirects = 1
net.ipv4.conf.eth0.secure_redirects = 1
net.ipv4.conf.eth0.shared_media = 1
net.ipv4.conf.eth0.rp_filter = 1
net.ipv4.conf.eth0.send_redirects = 1
net.ipv4.conf.eth0.accept_source_route = 0
net.ipv4.conf.eth0.accept_local = 0
net.ipv4.conf.eth0.src_valid_mark = 0
net.ipv4.conf.eth0.proxy_arp = 0
net.ipv4.conf.eth0.medium_id = 0
net.ipv4.conf.eth0.bootp_relay = 0
net.ipv4.conf.eth0.log_martians = 0
net.ipv4.conf.eth0.tag = 0
net.ipv4.conf.eth0.arp_filter = 0
net.ipv4.conf.eth0.arp_announce = 0
net.ipv4.conf.eth0.arp_ignore = 0
net.ipv4.conf.eth0.arp_accept = 0
net.ipv4.conf.eth0.arp_notify = 0
net.ipv4.conf.eth0.proxy_arp_pvlan = 0
net.ipv4.conf.eth0.disable_xfrm = 0
net.ipv4.conf.eth0.disable_policy = 0
net.ipv4.conf.eth0.force_igmp_version = 0
net.ipv4.conf.eth0.promote_secondaries = 0
net.ipv4.conf.eth1.forwarding = 1
net.ipv4.conf.eth1.mc_forwarding = 0
net.ipv4.conf.eth1.accept_redirects = 1
net.ipv4.conf.eth1.secure_redirects = 1
net.ipv4.conf.eth1.shared_media = 1
net.ipv4.conf.eth1.rp_filter = 1
net.ipv4.conf.eth1.send_redirects = 1
net.ipv4.conf.eth1.accept_source_route = 0
net.ipv4.conf.eth1.accept_local = 0
net.ipv4.conf.eth1.src_valid_mark = 0
net.ipv4.conf.eth1.proxy_arp = 0
net.ipv4.conf.eth1.medium_id = 0
net.ipv4.conf.eth1.bootp_relay = 0
net.ipv4.conf.eth1.log_martians = 0
net.ipv4.conf.eth1.tag = 0
net.ipv4.conf.eth1.arp_filter = 0
net.ipv4.conf.eth1.arp_announce = 0
net.ipv4.conf.eth1.arp_ignore = 0
net.ipv4.conf.eth1.arp_accept = 0
net.ipv4.conf.eth1.arp_notify = 0
net.ipv4.conf.eth1.proxy_arp_pvlan = 0
net.ipv4.conf.eth1.disable_xfrm = 0
net.ipv4.conf.eth1.disable_policy = 0
net.ipv4.conf.eth1.force_igmp_version = 0
net.ipv4.conf.eth1.promote_secondaries = 0
net.ipv4.conf.pan0.forwarding = 1
net.ipv4.conf.pan0.mc_forwarding = 0
net.ipv4.conf.pan0.accept_redirects = 1
net.ipv4.conf.pan0.secure_redirects = 1
net.ipv4.conf.pan0.shared_media = 1
net.ipv4.conf.pan0.rp_filter = 1
net.ipv4.conf.pan0.send_redirects = 1
net.ipv4.conf.pan0.accept_source_route = 0
net.ipv4.conf.pan0.accept_local = 0
net.ipv4.conf.pan0.src_valid_mark = 0
net.ipv4.conf.pan0.proxy_arp = 0
net.ipv4.conf.pan0.medium_id = 0
net.ipv4.conf.pan0.bootp_relay = 0
net.ipv4.conf.pan0.log_martians = 0
net.ipv4.conf.pan0.tag = 0
net.ipv4.conf.pan0.arp_filter = 0
net.ipv4.conf.pan0.arp_announce = 0
net.ipv4.conf.pan0.arp_ignore = 0
net.ipv4.conf.pan0.arp_accept = 0
net.ipv4.conf.pan0.arp_notify = 0
net.ipv4.conf.pan0.proxy_arp_pvlan = 0
net.ipv4.conf.pan0.disable_xfrm = 0
net.ipv4.conf.pan0.disable_policy = 0
net.ipv4.conf.pan0.force_igmp_version = 0
net.ipv4.conf.pan0.promote_secondaries = 0
net.ipv4.conf.virbr0.forwarding = 1
net.ipv4.conf.virbr0.mc_forwarding = 0
net.ipv4.conf.virbr0.accept_redirects = 1
net.ipv4.conf.virbr0.secure_redirects = 1
net.ipv4.conf.virbr0.shared_media = 1
net.ipv4.conf.virbr0.rp_filter = 1
net.ipv4.conf.virbr0.send_redirects = 1
net.ipv4.conf.virbr0.accept_source_route = 0
net.ipv4.conf.virbr0.accept_local = 0
net.ipv4.conf.virbr0.src_valid_mark = 0
net.ipv4.conf.virbr0.proxy_arp = 0
net.ipv4.conf.virbr0.medium_id = 0
net.ipv4.conf.virbr0.bootp_relay = 0
net.ipv4.conf.virbr0.log_martians = 0
net.ipv4.conf.virbr0.tag = 0
net.ipv4.conf.virbr0.arp_filter = 0
net.ipv4.conf.virbr0.arp_announce = 0
net.ipv4.conf.virbr0.arp_ignore = 0
net.ipv4.conf.virbr0.arp_accept = 0
net.ipv4.conf.virbr0.arp_notify = 0
net.ipv4.conf.virbr0.proxy_arp_pvlan = 0
net.ipv4.conf.virbr0.disable_xfrm = 0
net.ipv4.conf.virbr0.disable_policy = 0
net.ipv4.conf.virbr0.force_igmp_version = 0
net.ipv4.conf.virbr0.promote_secondaries = 0
net.ipv4.conf.virbr1.forwarding = 1
net.ipv4.conf.virbr1.mc_forwarding = 0
net.ipv4.conf.virbr1.accept_redirects = 1
net.ipv4.conf.virbr1.secure_redirects = 1
net.ipv4.conf.virbr1.shared_media = 1
net.ipv4.conf.virbr1.rp_filter = 1
net.ipv4.conf.virbr1.send_redirects = 1
net.ipv4.conf.virbr1.accept_source_route = 0
net.ipv4.conf.virbr1.accept_local = 0
net.ipv4.conf.virbr1.src_valid_mark = 0
net.ipv4.conf.virbr1.proxy_arp = 0
net.ipv4.conf.virbr1.medium_id = 0
net.ipv4.conf.virbr1.bootp_relay = 0
net.ipv4.conf.virbr1.log_martians = 0
net.ipv4.conf.virbr1.tag = 0
net.ipv4.conf.virbr1.arp_filter = 0
net.ipv4.conf.virbr1.arp_announce = 0
net.ipv4.conf.virbr1.arp_ignore = 0
net.ipv4.conf.virbr1.arp_accept = 0
net.ipv4.conf.virbr1.arp_notify = 0
net.ipv4.conf.virbr1.proxy_arp_pvlan = 0
net.ipv4.conf.virbr1.disable_xfrm = 0
net.ipv4.conf.virbr1.disable_policy = 0
net.ipv4.conf.virbr1.force_igmp_version = 0
net.ipv4.conf.virbr1.promote_secondaries = 0
net.ipv4.conf.virbr2.forwarding = 1
net.ipv4.conf.virbr2.mc_forwarding = 0
net.ipv4.conf.virbr2.accept_redirects = 1
net.ipv4.conf.virbr2.secure_redirects = 1
net.ipv4.conf.virbr2.shared_media = 1
net.ipv4.conf.virbr2.rp_filter = 1
net.ipv4.conf.virbr2.send_redirects = 1
net.ipv4.conf.virbr2.accept_source_route = 0
net.ipv4.conf.virbr2.accept_local = 0
net.ipv4.conf.virbr2.src_valid_mark = 0
net.ipv4.conf.virbr2.proxy_arp = 0
net.ipv4.conf.virbr2.medium_id = 0
net.ipv4.conf.virbr2.bootp_relay = 0
net.ipv4.conf.virbr2.log_martians = 0
net.ipv4.conf.virbr2.tag = 0
net.ipv4.conf.virbr2.arp_filter = 0
net.ipv4.conf.virbr2.arp_announce = 0
net.ipv4.conf.virbr2.arp_ignore = 0
net.ipv4.conf.virbr2.arp_accept = 0
net.ipv4.conf.virbr2.arp_notify = 0
net.ipv4.conf.virbr2.proxy_arp_pvlan = 0
net.ipv4.conf.virbr2.disable_xfrm = 0
net.ipv4.conf.virbr2.disable_policy = 0
net.ipv4.conf.virbr2.force_igmp_version = 0
net.ipv4.conf.virbr2.promote_secondaries = 0
net.ipv4.conf.tun0.forwarding = 1
net.ipv4.conf.tun0.mc_forwarding = 0
net.ipv4.conf.tun0.accept_redirects = 1
net.ipv4.conf.tun0.secure_redirects = 1
net.ipv4.conf.tun0.shared_media = 1
net.ipv4.conf.tun0.rp_filter = 1
net.ipv4.conf.tun0.send_redirects = 1
net.ipv4.conf.tun0.accept_source_route = 0
net.ipv4.conf.tun0.accept_local = 0
net.ipv4.conf.tun0.src_valid_mark = 0
net.ipv4.conf.tun0.proxy_arp = 0
net.ipv4.conf.tun0.medium_id = 0
net.ipv4.conf.tun0.bootp_relay = 0
net.ipv4.conf.tun0.log_martians = 0
net.ipv4.conf.tun0.tag = 0
net.ipv4.conf.tun0.arp_filter = 0
net.ipv4.conf.tun0.arp_announce = 0
net.ipv4.conf.tun0.arp_ignore = 0
net.ipv4.conf.tun0.arp_accept = 0
net.ipv4.conf.tun0.arp_notify = 0
net.ipv4.conf.tun0.proxy_arp_pvlan = 0
net.ipv4.conf.tun0.disable_xfrm = 0
net.ipv4.conf.tun0.disable_policy = 0
net.ipv4.conf.tun0.force_igmp_version = 0
net.ipv4.conf.tun0.promote_secondaries = 0
net.ipv4.ip_forward = 1
net.ipv4.xfrm4_gc_thresh = 2097152
net.ipv4.ipfrag_high_thresh = 262144
net.ipv4.ipfrag_low_thresh = 196608
net.ipv4.ipfrag_time = 30
net.ipv4.icmp_echo_ignore_all = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.icmp_errors_use_inbound_ifaddr = 0
net.ipv4.icmp_ratelimit = 1000
net.ipv4.icmp_ratemask = 6168
net.ipv4.rt_cache_rebuild_count = 4
net.ipv4.ipfrag_secret_interval = 600
net.ipv4.ipfrag_max_dist = 64
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