arp 버퍼 사이즈를 늘릴 수 있을까요?

아래와 같은 명령어를 이용해서 arp 테이블을 확인해 보면 사설 쪽의 IP Address가 출력됩니다.

[root@office root]# arp -n
Address HWtype HWaddress Flags Mask Iface
221.148.160.193 ether 00:02:3B:00:9F:E7 C eth0
172.31.30.1 ether 00:10:B5:E1:A1:26 C eth2

그런데 일부 클라이언트에서는 네트워크가 되는데 일부에서는 안되고 있습니다.

/var/log/kernel 로그를 확인해 보면 neighborhood over flow 와 같은 내용이 계속 올라오고

사설 클라이언트로 ping을 하면 no buffer space availabe 이라는 메시지가 출력됩니다.

근본 원인은 분명 다른 쪽에 있을 것 같긴 하지만 일단 네트워크를 살려놓고 봐야 하기 때문에 급한대로 arp buffer 크기를 좀 늘리고 싶습니다.

현재 서버 버전은 Redhat 9.0 이며 kernel 은 2.4.20 입니다.

[root@office root]# sysctl -a
abi.fake_utsname = 0
abi.trace = 0
abi.defhandler_libcso = 68157441
abi.defhandler_lcall7 = 68157441
abi.defhandler_elf = 0
abi.defhandler_coff = 117440515
dev.raid.speed_limit_max = 10000
dev.raid.speed_limit_min = 100
dev.rtc.max-user-freq = 64
debug.rpmarch =
debug.kerneltype =
net.unix.max_dgram_qlen = 10
net.token-ring.rif_timeout = 60000
net.ipv4.ip_queue_maxlen = 1024
net.ipv4.ip_conntrack_max = 12280
net.ipv4.conf.ppp0.arp_filter = 0
net.ipv4.conf.ppp0.tag = 0
net.ipv4.conf.ppp0.log_martians = 0
net.ipv4.conf.ppp0.bootp_relay = 0
net.ipv4.conf.ppp0.medium_id = 0
net.ipv4.conf.ppp0.proxy_arp = 0
net.ipv4.conf.ppp0.accept_source_route = 1
net.ipv4.conf.ppp0.send_redirects = 1
net.ipv4.conf.ppp0.rp_filter = 1
net.ipv4.conf.ppp0.shared_media = 1
net.ipv4.conf.ppp0.secure_redirects = 1
net.ipv4.conf.ppp0.accept_redirects = 1
net.ipv4.conf.ppp0.mc_forwarding = 0
net.ipv4.conf.ppp0.forwarding = 1
net.ipv4.conf.eth2.arp_filter = 0
net.ipv4.conf.eth2.tag = 0
net.ipv4.conf.eth2.log_martians = 0
net.ipv4.conf.eth2.bootp_relay = 0
net.ipv4.conf.eth2.medium_id = 0
net.ipv4.conf.eth2.proxy_arp = 0
net.ipv4.conf.eth2.accept_source_route = 1
net.ipv4.conf.eth2.send_redirects = 1
net.ipv4.conf.eth2.rp_filter = 1
net.ipv4.conf.eth2.shared_media = 1
net.ipv4.conf.eth2.secure_redirects = 1
net.ipv4.conf.eth2.accept_redirects = 1
net.ipv4.conf.eth2.mc_forwarding = 0
net.ipv4.conf.eth2.forwarding = 1
net.ipv4.conf.eth1.arp_filter = 0
net.ipv4.conf.eth1.tag = 0
net.ipv4.conf.eth1.log_martians = 0
net.ipv4.conf.eth1.bootp_relay = 0
net.ipv4.conf.eth1.medium_id = 0
net.ipv4.conf.eth1.proxy_arp = 0
net.ipv4.conf.eth1.accept_source_route = 1
net.ipv4.conf.eth1.send_redirects = 1
net.ipv4.conf.eth1.rp_filter = 1
net.ipv4.conf.eth1.shared_media = 1
net.ipv4.conf.eth1.secure_redirects = 1
net.ipv4.conf.eth1.accept_redirects = 1
net.ipv4.conf.eth1.mc_forwarding = 0
net.ipv4.conf.eth1.forwarding = 1
net.ipv4.conf.eth0.arp_filter = 0
net.ipv4.conf.eth0.tag = 0
net.ipv4.conf.eth0.log_martians = 0
net.ipv4.conf.eth0.bootp_relay = 0
net.ipv4.conf.eth0.medium_id = 0
net.ipv4.conf.eth0.proxy_arp = 0
net.ipv4.conf.eth0.accept_source_route = 1
net.ipv4.conf.eth0.send_redirects = 1
net.ipv4.conf.eth0.rp_filter = 1
net.ipv4.conf.eth0.shared_media = 1
net.ipv4.conf.eth0.secure_redirects = 1
net.ipv4.conf.eth0.accept_redirects = 1
net.ipv4.conf.eth0.mc_forwarding = 0
net.ipv4.conf.eth0.forwarding = 1
net.ipv4.conf.lo.arp_filter = 0
net.ipv4.conf.lo.tag = 0
net.ipv4.conf.lo.log_martians = 0
net.ipv4.conf.lo.bootp_relay = 0
net.ipv4.conf.lo.medium_id = 0
net.ipv4.conf.lo.proxy_arp = 0
net.ipv4.conf.lo.accept_source_route = 1
net.ipv4.conf.lo.send_redirects = 1
net.ipv4.conf.lo.rp_filter = 1
net.ipv4.conf.lo.shared_media = 1
net.ipv4.conf.lo.secure_redirects = 1
net.ipv4.conf.lo.accept_redirects = 1
net.ipv4.conf.lo.mc_forwarding = 0
net.ipv4.conf.lo.forwarding = 1
net.ipv4.conf.default.arp_filter = 0
net.ipv4.conf.default.tag = 0
net.ipv4.conf.default.log_martians = 0
net.ipv4.conf.default.bootp_relay = 0
net.ipv4.conf.default.medium_id = 0
net.ipv4.conf.default.proxy_arp = 0
net.ipv4.conf.default.accept_source_route = 1
net.ipv4.conf.default.send_redirects = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.shared_media = 1
net.ipv4.conf.default.secure_redirects = 1
net.ipv4.conf.default.accept_redirects = 1
net.ipv4.conf.default.mc_forwarding = 0
net.ipv4.conf.default.forwarding = 1
net.ipv4.conf.all.arp_filter = 0
net.ipv4.conf.all.tag = 0
net.ipv4.conf.all.log_martians = 0
net.ipv4.conf.all.bootp_relay = 0
net.ipv4.conf.all.medium_id = 0
net.ipv4.conf.all.proxy_arp = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.send_redirects = 1
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.all.shared_media = 1
net.ipv4.conf.all.secure_redirects = 1
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.mc_forwarding = 0
net.ipv4.conf.all.forwarding = 1
net.ipv4.neigh.ppp0.locktime = 100
net.ipv4.neigh.ppp0.proxy_delay = 80
net.ipv4.neigh.ppp0.anycast_delay = 100
net.ipv4.neigh.ppp0.proxy_qlen = 64
net.ipv4.neigh.ppp0.unres_qlen = 3
net.ipv4.neigh.ppp0.gc_stale_time = 60
net.ipv4.neigh.ppp0.delay_first_probe_time = 5
net.ipv4.neigh.ppp0.base_reachable_time = 30
net.ipv4.neigh.ppp0.retrans_time = 100
net.ipv4.neigh.ppp0.app_solicit = 0
net.ipv4.neigh.ppp0.ucast_solicit = 3
net.ipv4.neigh.ppp0.mcast_solicit = 3
net.ipv4.neigh.eth2.locktime = 100
net.ipv4.neigh.eth2.proxy_delay = 80
net.ipv4.neigh.eth2.anycast_delay = 100
net.ipv4.neigh.eth2.proxy_qlen = 64
net.ipv4.neigh.eth2.unres_qlen = 3
net.ipv4.neigh.eth2.gc_stale_time = 60
net.ipv4.neigh.eth2.delay_first_probe_time = 5
net.ipv4.neigh.eth2.base_reachable_time = 30
net.ipv4.neigh.eth2.retrans_time = 100
net.ipv4.neigh.eth2.app_solicit = 0
net.ipv4.neigh.eth2.ucast_solicit = 3
net.ipv4.neigh.eth2.mcast_solicit = 3
net.ipv4.neigh.eth1.locktime = 100
net.ipv4.neigh.eth1.proxy_delay = 80
net.ipv4.neigh.eth1.anycast_delay = 100
net.ipv4.neigh.eth1.proxy_qlen = 64
net.ipv4.neigh.eth1.unres_qlen = 3
net.ipv4.neigh.eth1.gc_stale_time = 60
net.ipv4.neigh.eth1.delay_first_probe_time = 5
net.ipv4.neigh.eth1.base_reachable_time = 30
net.ipv4.neigh.eth1.retrans_time = 100
net.ipv4.neigh.eth1.app_solicit = 0
net.ipv4.neigh.eth1.ucast_solicit = 3
net.ipv4.neigh.eth1.mcast_solicit = 3
net.ipv4.neigh.eth0.locktime = 100
net.ipv4.neigh.eth0.proxy_delay = 80
net.ipv4.neigh.eth0.anycast_delay = 100
net.ipv4.neigh.eth0.proxy_qlen = 64
net.ipv4.neigh.eth0.unres_qlen = 3
net.ipv4.neigh.eth0.gc_stale_time = 60
net.ipv4.neigh.eth0.delay_first_probe_time = 5
net.ipv4.neigh.eth0.base_reachable_time = 30
net.ipv4.neigh.eth0.retrans_time = 100
net.ipv4.neigh.eth0.app_solicit = 0
net.ipv4.neigh.eth0.ucast_solicit = 3
net.ipv4.neigh.eth0.mcast_solicit = 3
net.ipv4.neigh.lo.locktime = 100
net.ipv4.neigh.lo.proxy_delay = 80
net.ipv4.neigh.lo.anycast_delay = 100
net.ipv4.neigh.lo.proxy_qlen = 64
net.ipv4.neigh.lo.unres_qlen = 3
net.ipv4.neigh.lo.gc_stale_time = 60
net.ipv4.neigh.lo.delay_first_probe_time = 5
net.ipv4.neigh.lo.base_reachable_time = 30
net.ipv4.neigh.lo.retrans_time = 100
net.ipv4.neigh.lo.app_solicit = 0
net.ipv4.neigh.lo.ucast_solicit = 3
net.ipv4.neigh.lo.mcast_solicit = 3
net.ipv4.neigh.default.gc_thresh3 = 1024
net.ipv4.neigh.default.gc_thresh2 = 512
net.ipv4.neigh.default.gc_thresh1 = 128
net.ipv4.neigh.default.gc_interval = 30
net.ipv4.neigh.default.locktime = 100
net.ipv4.neigh.default.proxy_delay = 80
net.ipv4.neigh.default.anycast_delay = 100
net.ipv4.neigh.default.proxy_qlen = 64
net.ipv4.neigh.default.unres_qlen = 3
net.ipv4.neigh.default.gc_stale_time = 60
net.ipv4.neigh.default.delay_first_probe_time = 5
net.ipv4.neigh.default.base_reachable_time = 30
net.ipv4.neigh.default.retrans_time = 100
net.ipv4.neigh.default.app_solicit = 0
net.ipv4.neigh.default.ucast_solicit = 3
net.ipv4.neigh.default.mcast_solicit = 3
net.ipv4.ipfrag_secret_interval = 600
net.ipv4.tcp_low_latency = 0
net.ipv4.tcp_frto = 0
net.ipv4.tcp_tw_reuse = 0
net.ipv4.icmp_ratemask = 6168
net.ipv4.icmp_ratelimit = 100
net.ipv4.tcp_adv_win_scale = 2
net.ipv4.tcp_app_win = 31
net.ipv4.tcp_rmem = 4096 87380 174760
net.ipv4.tcp_wmem = 4096 16384 131072
net.ipv4.tcp_mem = 48128 48640 49152
net.ipv4.tcp_dsack = 1
net.ipv4.tcp_ecn = 0
net.ipv4.tcp_reordering = 3
net.ipv4.tcp_fack = 1
net.ipv4.tcp_orphan_retries = 0
net.ipv4.inet_peer_gc_maxtime = 120
net.ipv4.inet_peer_gc_mintime = 10
net.ipv4.inet_peer_maxttl = 600
net.ipv4.inet_peer_minttl = 120
net.ipv4.inet_peer_threshold = 65664
net.ipv4.igmp_max_memberships = 20
net.ipv4.route.secret_interval = 600
net.ipv4.route.min_adv_mss = 256
net.ipv4.route.min_pmtu = 552
net.ipv4.route.mtu_expires = 600
net.ipv4.route.gc_elasticity = 8
net.ipv4.route.error_burst = 500
net.ipv4.route.error_cost = 100
net.ipv4.route.redirect_silence = 2048
net.ipv4.route.redirect_number = 9
net.ipv4.route.redirect_load = 2
net.ipv4.route.gc_interval = 60
net.ipv4.route.gc_timeout = 300
net.ipv4.route.gc_min_interval = 5
net.ipv4.route.max_size = 16384
net.ipv4.route.gc_thresh = 1024
net.ipv4.route.max_delay = 10
net.ipv4.route.min_delay = 2
net.ipv4.icmp_ignore_bogus_error_responses = 0
net.ipv4.icmp_echo_ignore_broadcasts = 0
net.ipv4.icmp_echo_ignore_all = 0
net.ipv4.ip_local_port_range = 32768 61000
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.tcp_rfc1337 = 0
net.ipv4.tcp_stdurg = 0
net.ipv4.tcp_abort_on_overflow = 0
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_syncookies = 0
net.ipv4.tcp_fin_timeout = 60
net.ipv4.tcp_retries2 = 15
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_keepalive_intvl = 75
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.ipfrag_time = 30
net.ipv4.ip_dynaddr = 0
net.ipv4.ipfrag_low_thresh = 196608
net.ipv4.ipfrag_high_thresh = 262144
net.ipv4.tcp_max_tw_buckets = 180000
net.ipv4.tcp_max_orphans = 8192
net.ipv4.tcp_synack_retries = 5
net.ipv4.tcp_syn_retries = 5
net.ipv4.ip_nonlocal_bind = 0
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.ip_autoconfig = 0
net.ipv4.ip_default_ttl = 64
net.ipv4.ip_forward = 1
net.ipv4.tcp_retrans_collapse = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1
net.core.divert_version = 0.46
net.core.hot_list_length = 128
net.core.optmem_max = 10240
net.core.message_burst = 50
net.core.message_cost = 5
net.core.mod_cong = 290
net.core.lo_cong = 100
net.core.no_cong = 20
net.core.no_cong_thresh = 20
net.core.netdev_max_backlog = 300
net.core.dev_weight = 64
net.core.rmem_default = 65535
net.core.wmem_default = 65535
net.core.rmem_max = 65535
net.core.wmem_max = 65535
vm.max_map_count = 65536
vm.max-readahead = 31
vm.min-readahead = 3
vm.page-cluster = 3
vm.pagetable_cache = 25 50
vm.kswapd = 512 32 8
vm.overcommit_memory = 0
vm.bdflush = 50 500 0 0 500 3000 80 50 0
kernel.overflowgid = 65534
kernel.overflowuid = 65534
kernel.random.uuid = e2f4cad2-f814-4847-a9e7-6e45c6826e5e
kernel.random.boot_id = 71ecc76f-2398-4633-98c2-db3cb620f4cf
kernel.random.write_wakeup_threshold = 128
kernel.random.read_wakeup_threshold = 8
kernel.random.entropy_avail = 4096
kernel.random.poolsize = 512
kernel.pid_max = 32768
kernel.threads-max = 3071
kernel.cad_pid = 1
kernel.sysrq = 0
kernel.sem = 250 32000 32 128
kernel.msgmnb = 16384
kernel.msgmni = 16
kernel.msgmax = 8192
kernel.shmmni = 4096
kernel.shmall = 2097152
kernel.shmmax = 33554432
kernel.rtsig-max = 1024
kernel.rtsig-nr = 0
kernel.acct = 4 2 30
kernel.hotplug = /sbin/hotplug
kernel.modprobe = /sbin/modprobe
kernel.printk = 1 4 1 7
kernel.ctrl-alt-del = 0
kernel.real-root-dev = 256
kernel.cap-bound = -257
kernel.tainted = 0
kernel.core_pattern = core
kernel.core_uses_pid = 1
kernel.print_fatal_signals = 0
kernel.panic = 0
kernel.domainname = (none)
kernel.hostname = office.itop.biz
kernel.version = #1 Wed Jul 23 18:24:48 KST 2003
kernel.osrelease = 2.4.20-19.9
kernel.ostype = Linux
fs.quota.syncs = 8
fs.quota.free_dquots = 0
fs.quota.allocated_dquots = 0
fs.quota.cache_hits = 0
fs.quota.writes = 0
fs.quota.reads = 0
fs.quota.drops = 0
fs.quota.lookups = 0
fs.lease-break-time = 45
fs.dir-notify-enable = 1
fs.leases-enable = 1
fs.overflowgid = 65534
fs.overflowuid = 65534
fs.dentry-state = 3477 2633 45 0 0 0
fs.file-max = 19654
fs.file-nr = 1195 207 19654
fs.inode-state = 13014 9612 0 0 0 0 0
fs.inode-nr = 13014 9612

[root@office root]# cat /etc/sysctl.conf
# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 1

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1